Journal of Analytical and Applied Pyrolysis最新文献

英文中文

Influence of thermo-pressure synergistic effect on deoxygenation and aromatization reactions during extrusion pyrolysis of bagasse

IF 5.8 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis

Pub Date : 2025-02-05 DOI: 10.1016/j.jaap.2025.107003

Zhijie Gong , Kaiyue Zheng , Aishu Li , Kai Xu , Jun Xu , Long Jiang , Yi Wang , Sheng Su , Song Hu , Jun Xiang

Biomass has the potential to replace coal, contributing to the mitigation of climate and energy challenges. The development of low-energy, high-quality biomass upgrading technologies is of significant importance. The biomass extrusion pyrolysis (EP) technology, which increases the pressure during the heating process of biomass pyrolysis, is anticipated to achieve the desired outcome. Pressure, temperature, and residence time were investigated for their effects on the physicochemical properties and structure of bagasse-derived biochar during EP. The volatile content of EP biochar decreased by 10.21∼12.63 % and the carbon fixation rate (CFR) increased by 23.04∼30.56 % compared with atmospheric pyrolysis (AP) biochar at the same temperature and residence time, below 6 MPa. A synergistic effect of pressure and temperature was observed, resulting in an approximately 10 % reduction in volatile content and a 10∼20 % increase in CFR of extruded pyrolysis products at 6 MPa, compared to AP above 240 °C. Below 240 °C, these values were lower. Comparing the pyrolysis product biochar of AP and EP, as well as those from low and high temperatures, FTIR and Raman analyses demonstrated that oxygen-containing functional groups decreased and the degree of aromatization increased, confirming that extrusion and temperature facilitated deoxygenation and aromatization. Extrusion caused pore structure contraction. In BET data, the specific surface area and pore volume decreased significantly. These, coupled with changes in the biochar's physicochemical properties, indicated that extrusion promoted volatile matter conversion into fixed carbon by gas-solid secondary reactions during pyrolysis.

{"title":"Influence of thermo-pressure synergistic effect on deoxygenation and aromatization reactions during extrusion pyrolysis of bagasse","authors":"Zhijie Gong , Kaiyue Zheng , Aishu Li , Kai Xu , Jun Xu , Long Jiang , Yi Wang , Sheng Su , Song Hu , Jun Xiang","doi":"10.1016/j.jaap.2025.107003","DOIUrl":"10.1016/j.jaap.2025.107003","url":null,"abstract":"<div><div>Biomass has the potential to replace coal, contributing to the mitigation of climate and energy challenges. The development of low-energy, high-quality biomass upgrading technologies is of significant importance. The biomass extrusion pyrolysis (EP) technology, which increases the pressure during the heating process of biomass pyrolysis, is anticipated to achieve the desired outcome. Pressure, temperature, and residence time were investigated for their effects on the physicochemical properties and structure of bagasse-derived biochar during EP. The volatile content of EP biochar decreased by 10.21∼12.63 % and the carbon fixation rate (CFR) increased by 23.04∼30.56 % compared with atmospheric pyrolysis (AP) biochar at the same temperature and residence time, below 6 MPa. A synergistic effect of pressure and temperature was observed, resulting in an approximately 10 % reduction in volatile content and a 10∼20 % increase in CFR of extruded pyrolysis products at 6 MPa, compared to AP above 240 °C. Below 240 °C, these values were lower. Comparing the pyrolysis product biochar of AP and EP, as well as those from low and high temperatures, FTIR and Raman analyses demonstrated that oxygen-containing functional groups decreased and the degree of aromatization increased, confirming that extrusion and temperature facilitated deoxygenation and aromatization. Extrusion caused pore structure contraction. In BET data, the specific surface area and pore volume decreased significantly. These, coupled with changes in the biochar's physicochemical properties, indicated that extrusion promoted volatile matter conversion into fixed carbon by gas-solid secondary reactions during pyrolysis.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"187 ","pages":"Article 107003"},"PeriodicalIF":5.8,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143377270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Removal of tetracycline from aqueous solution by magnetic biochar modified with different iron valence and K2C2O4: A comparative study and mechanism

IF 5.8 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis

Pub Date : 2025-02-05 DOI: 10.1016/j.jaap.2025.107005

Guodong Hong , Zhenqiang Yu , Dexin Kong , Taoli Huhe , Rui Shan , Haoran Yuan , Yong Chen

Currently, the selection of iron valence states in composite-modified magnetic biochar prepared by co-pyrolysis exhibits a high degree of blindness. Therefore, this study compares the performance of biochar preparation via co-pyrolysis of three different iron valences (Fe^2 +, Fe³⁺, and Fe⁶⁺) and potassium oxalate (K₂C₂O₄) composite modification for tetracycline (TC) removal. The results indicate that the co-activation of potassium oxalate with different iron valences led to the formation of magnetic biochar with varying elemental contents, morphologies, and structures. Batch adsorption experiments demonstrate that KF3-BC has a high tetracycline removal rate over a wide pH range (3 – 11) and at high coexisting ion concentrations (1 – 100 mmol/L). Furthermore, experiments with synthetic swine wastewater in different matrices, the adsorption capacity of KF3-BC for TC (at a concentration of 100 mg/L) exceeds 81.09 mg/g. Additionally, under optimal conditions of 30 °C and pH = 5, the theoretical maximum adsorption capacity (Q_max) for TC is as follows: KF3-BC (236.91 mg/g) > KF6-BC (169.42 mg/g) > KF2-BC (51.34 mg/g) > BC (38.41 mg/g). The adsorption processes of KF2-BC, KF3-BC, and KF6-BC all conform to the Pseudo-second-order and Freundlich models, implying that TC adsorption occurs at the multilayer molecular adsorption on heterogeneous surfaces, primarily driven by chemisorption. The primary adsorption mechanism between KF-BCs and TC molecules is the π–π EDA interactions. Additionally, hydrogen bonding, cation–π complexation, electrostatic interactions, and pore filling also contribute to the adsorption process. This study can assist in selecting the optimal iron source and chemical activator for composite modification of biochar for the adsorption of TC in wastewater.

{"title":"Removal of tetracycline from aqueous solution by magnetic biochar modified with different iron valence and K2C2O4: A comparative study and mechanism","authors":"Guodong Hong , Zhenqiang Yu , Dexin Kong , Taoli Huhe , Rui Shan , Haoran Yuan , Yong Chen","doi":"10.1016/j.jaap.2025.107005","DOIUrl":"10.1016/j.jaap.2025.107005","url":null,"abstract":"<div><div>Currently, the selection of iron valence states in composite-modified magnetic biochar prepared by co-pyrolysis exhibits a high degree of blindness. Therefore, this study compares the performance of biochar preparation via co-pyrolysis of three different iron valences (Fe<sup>2 +</sup>, Fe<sup>3+</sup>, and Fe<sup>6+</sup>) and potassium oxalate (K<sub>2</sub>C<sub>2</sub>O<sub>4</sub>) composite modification for tetracycline (TC) removal. The results indicate that the co-activation of potassium oxalate with different iron valences led to the formation of magnetic biochar with varying elemental contents, morphologies, and structures. Batch adsorption experiments demonstrate that KF3-BC has a high tetracycline removal rate over a wide pH range (3 – 11) and at high coexisting ion concentrations (1 – 100 mmol/L). Furthermore, experiments with synthetic swine wastewater in different matrices, the adsorption capacity of KF3-BC for TC (at a concentration of 100 mg/L) exceeds 81.09 mg/g. Additionally, under optimal conditions of 30 °C and pH = 5, the theoretical maximum adsorption capacity (Q<sub>max</sub>) for TC is as follows: KF3-BC (236.91 mg/g) > KF6-BC (169.42 mg/g) > KF2-BC (51.34 mg/g) > BC (38.41 mg/g). The adsorption processes of KF2-BC, KF3-BC, and KF6-BC all conform to the Pseudo-second-order and Freundlich models, implying that TC adsorption occurs at the multilayer molecular adsorption on heterogeneous surfaces, primarily driven by chemisorption. The primary adsorption mechanism between KF-BCs and TC molecules is the π–π EDA interactions. Additionally, hydrogen bonding, cation–π complexation, electrostatic interactions, and pore filling also contribute to the adsorption process. This study can assist in selecting the optimal iron source and chemical activator for composite modification of biochar for the adsorption of TC in wastewater.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"187 ","pages":"Article 107005"},"PeriodicalIF":5.8,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143334433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Deciphering synergistic effects in co-pyrolysis: Insights from pyrolysis-gas chromatography–mass spectrometry and evolved gas analysis for sustainable biorefineries

IF 5.8 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis

Pub Date : 2025-02-04 DOI: 10.1016/j.jaap.2025.106990

Crystal Chia Yin Ling , Elvi Horiyanto , Cynthia Melanie Lahey , Sam Fong Yau Li

Harnessing synergistic interactions during co-pyrolysis provides a cost-effective and resource-efficient alternative to catalytic pyrolysis for optimizing product composition and quality. Despite recent progress in understanding these interactions, a systematic method to deconvolute the effects of synergism on bio-oil composition during co-pyrolysis has remained elusive. This study presents a novel method for deconvoluting synergistic effects during the co-pyrolysis of sewage sludge (SS) and polyethylene terephthalate (PET) using unique sample configurations and pyrolysis gas chromatography-mass spectrometry (Py-GCMS). Synergistic interactions during SS/PET co-pyrolysis were found to enhance decarboxylation and dehydration reactions, leading to the formation of novel compounds not observed in the individual pyrolysis of either feedstock. By utilizing unique sample configurations, the developed method identified vapor-phase interactions as the primary interface for these synergistic effects. Additionally, it determined the optimal co-pyrolysis conditions for maximizing benzoic acid production, demonstrating its dual effectiveness in uncovering synergistic mechanisms and optimizing product yields for biorefining applications. Overall, the developed method streamlines the deconvolution of synergistic interactions, making it a valuable tool for understanding synergistic interfaces and optimizing product yields for biorefining applications.

{"title":"Deciphering synergistic effects in co-pyrolysis: Insights from pyrolysis-gas chromatography–mass spectrometry and evolved gas analysis for sustainable biorefineries","authors":"Crystal Chia Yin Ling , Elvi Horiyanto , Cynthia Melanie Lahey , Sam Fong Yau Li","doi":"10.1016/j.jaap.2025.106990","DOIUrl":"10.1016/j.jaap.2025.106990","url":null,"abstract":"<div><div>Harnessing synergistic interactions during co-pyrolysis provides a cost-effective and resource-efficient alternative to catalytic pyrolysis for optimizing product composition and quality. Despite recent progress in understanding these interactions, a systematic method to deconvolute the effects of synergism on bio-oil composition during co-pyrolysis has remained elusive. This study presents a novel method for deconvoluting synergistic effects during the co-pyrolysis of sewage sludge (SS) and polyethylene terephthalate (PET) using unique sample configurations and pyrolysis gas chromatography-mass spectrometry (Py-GCMS). Synergistic interactions during SS/PET co-pyrolysis were found to enhance decarboxylation and dehydration reactions, leading to the formation of novel compounds not observed in the individual pyrolysis of either feedstock. By utilizing unique sample configurations, the developed method identified vapor-phase interactions as the primary interface for these synergistic effects. Additionally, it determined the optimal co-pyrolysis conditions for maximizing benzoic acid production, demonstrating its dual effectiveness in uncovering synergistic mechanisms and optimizing product yields for biorefining applications. Overall, the developed method streamlines the deconvolution of synergistic interactions, making it a valuable tool for understanding synergistic interfaces and optimizing product yields for biorefining applications.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"187 ","pages":"Article 106990"},"PeriodicalIF":5.8,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143350583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Kinetics, product distribution and synergistic effects on the co-pyrolysis processes for epoxy resins and balsa wood

IF 5.8 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis

Pub Date : 2025-02-04 DOI: 10.1016/j.jaap.2025.106995

Kunyuan Liu , Honggang Fan , Liubao Nie , Jing Gu , Haoran Yuan

This work systematically examined the co-pyrolysis behaviors and product distribution of epoxy resins (EP) and balsa wood (BW) from waste wind turbine blades (WWTBs) using thermogravimetric analysis coupled with Fourier transform infrared spectroscopy and mass spectrometry (TG-FTIR-MS) and pyrolysis gas chromatography/mass spectrometry (Py-GC/MS). Kissinger-Akahira-Sunose (KAS) model, Flynn-Wall-Ozawa (FWO) model and distributed activation energy models (DAEM) were applied to analyze the co-pyrolysis kinetics. Thermogravimetric results showed that synergistic effects promoted thermal decomposition of the blends. The presence of EP dramatically reduced the energy barrier for BW decomposition. Three-Gaussian-DAEM (TG-DAEM) provided better fitting accuracy for co-pyrolysis behaviors. Product analysis indicated that co-pyrolysis promoted the generation of phenols and hexatomic ring compounds, likely due to Diels-Alder reactions, enhancing efficiency at early and middle stages of co-pyrolysis. However, macromolecules generated required additional energy for cracking into lighter products. Both synergistic and antagonistic effects were observed during co-pyrolysis. These findings are significant for WWTBs composites recovery and recycling.

{"title":"Kinetics, product distribution and synergistic effects on the co-pyrolysis processes for epoxy resins and balsa wood","authors":"Kunyuan Liu , Honggang Fan , Liubao Nie , Jing Gu , Haoran Yuan","doi":"10.1016/j.jaap.2025.106995","DOIUrl":"10.1016/j.jaap.2025.106995","url":null,"abstract":"<div><div>This work systematically examined the co-pyrolysis behaviors and product distribution of epoxy resins (EP) and balsa wood (BW) from waste wind turbine blades (WWTBs) using thermogravimetric analysis coupled with Fourier transform infrared spectroscopy and mass spectrometry (TG-FTIR-MS) and pyrolysis gas chromatography/mass spectrometry (Py-GC/MS). Kissinger-Akahira-Sunose (KAS) model, Flynn-Wall-Ozawa (FWO) model and distributed activation energy models (DAEM) were applied to analyze the co-pyrolysis kinetics. Thermogravimetric results showed that synergistic effects promoted thermal decomposition of the blends. The presence of EP dramatically reduced the energy barrier for BW decomposition. Three-Gaussian-DAEM (TG-DAEM) provided better fitting accuracy for co-pyrolysis behaviors. Product analysis indicated that co-pyrolysis promoted the generation of phenols and hexatomic ring compounds, likely due to Diels-Alder reactions, enhancing efficiency at early and middle stages of co-pyrolysis. However, macromolecules generated required additional energy for cracking into lighter products. Both synergistic and antagonistic effects were observed during co-pyrolysis. These findings are significant for WWTBs composites recovery and recycling.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"187 ","pages":"Article 106995"},"PeriodicalIF":5.8,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143350581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Constructing the correlation between optical microstructures and macroscopic properties of medium temperature coal pitch-derived cokes

IF 5.8 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis

Pub Date : 2025-02-04 DOI: 10.1016/j.jaap.2025.107001

Jiaxing Yue , Jiao Huang , Yaming Zhu , Yuzhu Zhang , Jun Lv , Junxia Cheng , Xuefei Zhao

With the rapid development of the new energy industry, pitch-derived coke now shows greater potential than graphite anode. For investigate the correlation between optical microstructures and macroscopic properties of pitch coke, 6 pitch cokes with varying structures were prepared from medium temperature coal pitch (MTP) and its 5 fractions. Then, these pitch cokes were applied in lithium-ion batteries to evaluate their electrochemical performances. The results showed that the optical microstructures of pitch coke have significant influence on the macroscopic properties including electrochemical performances. In fact, pitch coke with high anisotropic index (DRAS) possesses high capacity and low powder resistivity. Its fibrous structure brings better oxidation resistance. While the mosaic structure contributes more to the improvement of the micro-strength intensity (MSI) of pitch coke. In addition, fine and medium mosaic structure have obvious influence on the rate performance and Warburg factor (σ) of pitch coke, respectively. Among several pitch cokes, BAI-TS-1400 has the best rate performance and initial coulombic efficiency (73.84 %). After 400 cycles at 0.05 A·g⁻¹, its capacity maintains 402.4 mAh·g⁻¹, exhibiting nice cycle stability. Thus, it’s a promising for lithium-ion battery anodes material. This work provides theoretical and experimental support for the high value-added utilization of pitch coke.

{"title":"Constructing the correlation between optical microstructures and macroscopic properties of medium temperature coal pitch-derived cokes","authors":"Jiaxing Yue , Jiao Huang , Yaming Zhu , Yuzhu Zhang , Jun Lv , Junxia Cheng , Xuefei Zhao","doi":"10.1016/j.jaap.2025.107001","DOIUrl":"10.1016/j.jaap.2025.107001","url":null,"abstract":"<div><div>With the rapid development of the new energy industry, pitch-derived coke now shows greater potential than graphite anode. For investigate the correlation between optical microstructures and macroscopic properties of pitch coke, 6 pitch cokes with varying structures were prepared from medium temperature coal pitch (MTP) and its 5 fractions. Then, these pitch cokes were applied in lithium-ion batteries to evaluate their electrochemical performances. The results showed that the optical microstructures of pitch coke have significant influence on the macroscopic properties including electrochemical performances. In fact, pitch coke with high anisotropic index (DRAS) possesses high capacity and low powder resistivity. Its fibrous structure brings better oxidation resistance. While the mosaic structure contributes more to the improvement of the micro-strength intensity (MSI) of pitch coke. In addition, fine and medium mosaic structure have obvious influence on the rate performance and Warburg factor (σ) of pitch coke, respectively. Among several pitch cokes, BAI-TS-1400 has the best rate performance and initial coulombic efficiency (73.84 %). After 400 cycles at 0.05 A·g<sup>−1</sup>, its capacity maintains 402.4 mAh·g<sup>−1</sup>, exhibiting nice cycle stability. Thus, it’s a promising for lithium-ion battery anodes material. This work provides theoretical and experimental support for the high value-added utilization of pitch coke.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"187 ","pages":"Article 107001"},"PeriodicalIF":5.8,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143334437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Activity and stability of Ni/magnesium slag catalysts enhanced by plasma pretreatment for toluene steam reforming

IF 5.8 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis

Pub Date : 2025-02-03 DOI: 10.1016/j.jaap.2025.106996

Jicheng Wang, Haimiao Yu, Hao Liang

This study investigated the influence of plasma pretreatment on the catalytic performance of a nickel-based catalyst supported by magnesium slag (MS) in the catalytic steam reforming of toluene. The catalyst obtained after plasma pretreatment achieved the highest toluene conversion rate of 99.11 % and the substantial hydrogen yield of 3165.02 mL/g after 6 h of reaction. Additionally, at the end of the reaction, the toluene conversion rate of the plasma-pretreated catalyst was 92.56 %, which was 38.19 % higher than that of the calcined catalyst. Plasma pretreatment significantly enhanced the activity and stability of Ni-based catalyst in toluene steam reforming. Characterization results indicated that plasma treatment promoted the migration of metal species from pores to the external surface of the support and facilitated the formation of smaller Ni particles with higher dispersion. Therefore, plasma treatment exposed more active sites and enhanced the catalytic activity. Furthermore, plasma pretreatment improved the interaction between Ni and the support, generated more Ni(111) crystal planes, reduced the formation of filamentous carbon, accelerated the removal of carbon deposits, and thus enhanced the catalyst stability.

{"title":"Activity and stability of Ni/magnesium slag catalysts enhanced by plasma pretreatment for toluene steam reforming","authors":"Jicheng Wang, Haimiao Yu, Hao Liang","doi":"10.1016/j.jaap.2025.106996","DOIUrl":"10.1016/j.jaap.2025.106996","url":null,"abstract":"<div><div>This study investigated the influence of plasma pretreatment on the catalytic performance of a nickel-based catalyst supported by magnesium slag (MS) in the catalytic steam reforming of toluene. The catalyst obtained after plasma pretreatment achieved the highest toluene conversion rate of 99.11 % and the substantial hydrogen yield of 3165.02 mL/g after 6 h of reaction. Additionally, at the end of the reaction, the toluene conversion rate of the plasma-pretreated catalyst was 92.56 %, which was 38.19 % higher than that of the calcined catalyst. Plasma pretreatment significantly enhanced the activity and stability of Ni-based catalyst in toluene steam reforming. Characterization results indicated that plasma treatment promoted the migration of metal species from pores to the external surface of the support and facilitated the formation of smaller Ni particles with higher dispersion. Therefore, plasma treatment exposed more active sites and enhanced the catalytic activity. Furthermore, plasma pretreatment improved the interaction between Ni and the support, generated more Ni(111) crystal planes, reduced the formation of filamentous carbon, accelerated the removal of carbon deposits, and thus enhanced the catalyst stability.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"187 ","pages":"Article 106996"},"PeriodicalIF":5.8,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143334438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Co-pyrolysis of Pingshuo coal and polystyrene via infrared heating to produce light aromatic hydrocarbons

IF 5.8 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis

Pub Date : 2025-02-03 DOI: 10.1016/j.jaap.2025.106997

Yunfei Wu , Yang Li , Lijun Jin , Haoquan Hu

The co-pyrolysis of coal and waste plastics is a viable method for achieving efficient and clean utilization of coal and waste and enhancing light aromatic hydrocarbon production. In this study, the co-pyrolysis of Pingshuo coal and polystyrene (PS) was carried out via rapid infrared heating in a fixed bed reactor with varying mixing ratios to investigate the product distribution, tar composition, and char characteristics. The results revealed that the increase of PS mixing ratio increased the interaction of the co-pyrolysis volatiles, which raised the tar and light aromatic hydrocarbons yield. Especially for the mixing ratio of coal/PS being 7:3, the content of styrene and ethylbenzene in tar is 31.5 % and 15.2 % higher than the theoretically calculated value, respectively. Moreover, co-pyrolysis promoted the interaction between volatiles to produce biphenyls such as 1,3-diphenylpropane. Electron paramagnetic resonance results indicated that the co-pyrolysis char exhibited higher amounts of methoxy ether and 1–3 cyclic π quinone free radicals, which was consistent with the decrease of phenols in the tar.

{"title":"Co-pyrolysis of Pingshuo coal and polystyrene via infrared heating to produce light aromatic hydrocarbons","authors":"Yunfei Wu , Yang Li , Lijun Jin , Haoquan Hu","doi":"10.1016/j.jaap.2025.106997","DOIUrl":"10.1016/j.jaap.2025.106997","url":null,"abstract":"<div><div>The co-pyrolysis of coal and waste plastics is a viable method for achieving efficient and clean utilization of coal and waste and enhancing light aromatic hydrocarbon production. In this study, the co-pyrolysis of Pingshuo coal and polystyrene (PS) was carried out via rapid infrared heating in a fixed bed reactor with varying mixing ratios to investigate the product distribution, tar composition, and char characteristics. The results revealed that the increase of PS mixing ratio increased the interaction of the co-pyrolysis volatiles, which raised the tar and light aromatic hydrocarbons yield. Especially for the mixing ratio of coal/PS being 7:3, the content of styrene and ethylbenzene in tar is 31.5 % and 15.2 % higher than the theoretically calculated value, respectively. Moreover, co-pyrolysis promoted the interaction between volatiles to produce biphenyls such as 1,3-diphenylpropane. Electron paramagnetic resonance results indicated that the co-pyrolysis char exhibited higher amounts of methoxy ether and 1–3 cyclic π quinone free radicals, which was consistent with the decrease of phenols in the tar.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"187 ","pages":"Article 106997"},"PeriodicalIF":5.8,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143334436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of calcination temperature of red mud POC and hydrothermal pretreatment of wet sludge on syngas quality

IF 5.8 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis

Pub Date : 2025-02-03 DOI: 10.1016/j.jaap.2025.106993

Zewen An , Jialu Li , Kun Wang , Xiaoying Yuan , Cuiping Wang , Qingjie Guo

CaMn_0.5Fe_0.5O_3-δ-type perovskite oxygen carriers (POCs) were prepared using red mud as the main raw material and configuring certain ratios of calcium and manganese elements followed by calcination under different temperatures. A series of experiments were conducted in a fixed bed reactor to prepare hydrogen-rich syngas from municipal wet sludge chemical looping gasification (CLG). The results showed that the calcination temperature has an important influence on the oxygen storage capacity of the modified red mud perovskite oxygen carrier. With the increase of calcination temperature, the oxygen decoupling capacity of the oxygen carrier continues to improve, but the catalytic performance continues to weaken. Compared with the POCs calcined at 1050 ℃ and 950 ℃, the quality of hydrogen-rich gas prepared by the POC calcined at 850 ℃ was better, with a hydrogen gas volume fraction of 44.7 %, exceeding the theoretical value of converting hydrogen elements contained in dry sludge into hydrogen gas. The lower calcination temperature makes POC have larger specific surface area and better catalytic performance, which is conducive to the catalytic reforming of gas components such as CH₄ and CO. The hydrothermal pretreatment of sludge is beneficial to improve the specific surface area of sludge and thus to improve the quality of syngas. The syngas hydrogen gas volume fraction reached 59.9 % using the POC calcined at 850 ℃ with sludge hydrothermal pretreatment at 250 ℃, and the syngas calorific value reached 13.47 MJ/Nm³ . By balancing the carbon and hydrogen elements transferring after the wet sludge gasification, part of sludge moisture participated in the carbon gasification and methane reforming reactions, thereby increasing the hydrogen content in syngas. The study is of guiding significance for the selection of oxygen carriers and fuel pretreatment in CLG of wet sludge.

{"title":"Effect of calcination temperature of red mud POC and hydrothermal pretreatment of wet sludge on syngas quality","authors":"Zewen An , Jialu Li , Kun Wang , Xiaoying Yuan , Cuiping Wang , Qingjie Guo","doi":"10.1016/j.jaap.2025.106993","DOIUrl":"10.1016/j.jaap.2025.106993","url":null,"abstract":"<div><div>CaMn<sub>0.5</sub>Fe<sub>0.5</sub>O<sub>3-δ</sub>-type perovskite oxygen carriers (POCs) were prepared using red mud as the main raw material and configuring certain ratios of calcium and manganese elements followed by calcination under different temperatures. A series of experiments were conducted in a fixed bed reactor to prepare hydrogen-rich syngas from municipal wet sludge chemical looping gasification (CLG). The results showed that the calcination temperature has an important influence on the oxygen storage capacity of the modified red mud perovskite oxygen carrier. With the increase of calcination temperature, the oxygen decoupling capacity of the oxygen carrier continues to improve, but the catalytic performance continues to weaken. Compared with the POCs calcined at 1050 ℃ and 950 ℃, the quality of hydrogen-rich gas prepared by the POC calcined at 850 ℃ was better, with a hydrogen gas volume fraction of 44.7 %, exceeding the theoretical value of converting hydrogen elements contained in dry sludge into hydrogen gas. The lower calcination temperature makes POC have larger specific surface area and better catalytic performance, which is conducive to the catalytic reforming of gas components such as CH<sub>4</sub> and CO. The hydrothermal pretreatment of sludge is beneficial to improve the specific surface area of sludge and thus to improve the quality of syngas. The syngas hydrogen gas volume fraction reached 59.9 % using the POC calcined at 850 ℃ with sludge hydrothermal pretreatment at 250 ℃, and the syngas calorific value reached 13.47 MJ/Nm³ . By balancing the carbon and hydrogen elements transferring after the wet sludge gasification, part of sludge moisture participated in the carbon gasification and methane reforming reactions, thereby increasing the hydrogen content in syngas. The study is of guiding significance for the selection of oxygen carriers and fuel pretreatment in CLG of wet sludge.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"187 ","pages":"Article 106993"},"PeriodicalIF":5.8,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Efficient styrene removal from refuse-derived fuel pyrolysis oil using waste hydroprocessing catalysts

IF 5.8 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis

Pub Date : 2025-02-01 DOI: 10.1016/j.jaap.2025.106992

Sergio Cañete , Sergio David González-Egido , Laura Faba , Salvador Ordóñez

This study demonstrates that deactivated catalysts discarded by the hydroprocessing industry are effective for the partial hydrogenation of refuse-derived fuel pyrolysis oil. Both NiMo and CoMo catalysts exhibited high activity, reducing the styrene content of this oil by almost 85 %, which improves the oil processability in oil-refining facilities, as styrene is the main gum precursor in these operations. The process is optimized at 200ºC, a temperature significantly lower than those typically proposed for such treatments. Experimental results confirm that sulphur activates the metals and that the partial blockage of the alumina’s acidic sites by coke prevents undesired condensations, which would otherwise lead to rapid catalyst deactivation. This research demonstrates the feasibility of using waste (deactivated catalysts) to enhance the stability of a waste-derived raw material (refuse-derived fuel pyrolysis oil), thereby boosting its upgrading potential and supporting pyrolysis as a key player in the Circular Economy.

引用次数: 0

Experimental study on feasibility of using delayed coking process for conversion of high acidic crude oil

IF 5.8 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis

Pub Date : 2025-01-31 DOI: 10.1016/j.jaap.2025.106991

Pradeep PR, Shahil Siddiqui, Shivam A. Dixit, Satyen Kumar Das, Amardeep Singh, Sarvesh Kumar, Madhusudan Sau, Alok Sharma

Processing crude oils with high Total Acid Number (TAN) requires hardware modifications, especially metallurgy of various units in the petroleum refinery. Therefore, a process scheme has been devised to use the petroleum refinery's Delayed Coker Unit (DCU) to process the high TAN crude without major modifications in other units and eliminate the need for atmospheric and vacuum fractionators. In this study, high TAN crude has been characterized by various analytical techniques such as FTIR, TGA, and XRF, as well as a distribution of the TAN in various boiling ranges of the crude oil. The thermal decomposition behaviour of high TAN crude has been studied via TGA/DTG analysis using iso-conversional methods. Kissinger-Akahira-Sunose (KAS), Tang, and Starink methods were used for kinetic parameter estimation. Bench scale microreactor thermal cracking experiments were carried out using high TAN crude. It was found that temperature plays a crucial role in reducing the TAN of liquid products, and it was established that the reduction of TAN from high values of ∼2 mgKOH/g to lower values of ∼0.4 mgKOH/g is feasible using Delayed Coking. Bench-scale experiments also elucidated the impacts of temperature on product yields. Based on these, pilot-scale experimentation in a 1 bbl/day Delayed Coker Pilot Plant was also carried out to simulate commercial DCU operations using high TAN crude as the feedstock. The results of bench scale experiment were validated in the pilot scale in terms of reduction in acidity of the cracked products and product yields.

{"title":"Experimental study on feasibility of using delayed coking process for conversion of high acidic crude oil","authors":"Pradeep PR, Shahil Siddiqui, Shivam A. Dixit, Satyen Kumar Das, Amardeep Singh, Sarvesh Kumar, Madhusudan Sau, Alok Sharma","doi":"10.1016/j.jaap.2025.106991","DOIUrl":"10.1016/j.jaap.2025.106991","url":null,"abstract":"<div><div>Processing crude oils with high Total Acid Number (TAN) requires hardware modifications, especially metallurgy of various units in the petroleum refinery. Therefore, a process scheme has been devised to use the petroleum refinery's Delayed Coker Unit (DCU) to process the high TAN crude without major modifications in other units and eliminate the need for atmospheric and vacuum fractionators. In this study, high TAN crude has been characterized by various analytical techniques such as FTIR, TGA, and XRF, as well as a distribution of the TAN in various boiling ranges of the crude oil. The thermal decomposition behaviour of high TAN crude has been studied via TGA/DTG analysis using iso-conversional methods. Kissinger-Akahira-Sunose (KAS), Tang, and Starink methods were used for kinetic parameter estimation. Bench scale microreactor thermal cracking experiments were carried out using high TAN crude. It was found that temperature plays a crucial role in reducing the TAN of liquid products, and it was established that the reduction of TAN from high values of ∼2 mgKOH/g to lower values of ∼0.4 mgKOH/g is feasible using Delayed Coking. Bench-scale experiments also elucidated the impacts of temperature on product yields. Based on these, pilot-scale experimentation in a 1 bbl/day Delayed Coker Pilot Plant was also carried out to simulate commercial DCU operations using high TAN crude as the feedstock. The results of bench scale experiment were validated in the pilot scale in terms of reduction in acidity of the cracked products and product yields.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"187 ","pages":"Article 106991"},"PeriodicalIF":5.8,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143334435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

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