Journal of Analytical and Applied Pyrolysis最新文献

{"title":"Probing co-pyrolysis of rice straw with sulfur-donor thiourea: Insights into product evolution, reaction kinetics, thermodynamics, and compensation effects","authors":"Zhitong Yao ,&nbsp;Taoqi Yang ,&nbsp;Baoyi Lin ,&nbsp;Weihong Wu ,&nbsp;Yang Chen ,&nbsp;Nebojša Manić ,&nbsp;Ljiljana Medic Pejic ,&nbsp;Akash Kumar ,&nbsp;Wei Qi","doi":"10.1016/j.jaap.2026.107647","DOIUrl":"10.1016/j.jaap.2026.107647","url":null,"abstract":"<div><div>Understanding the synergistic interactions between biomass and sulfur-containing additives during co-pyrolysis is crucial for controlling sulfur transformation pathways and tailoring sulfur-doped carbonaceous materials. In the present study, the pyrolysis conversion of rice straw, thiourea, and their blend were probed using thermogravimetric analysis coupled with evolved gas analysis (TG–FTIR–MS and TG–GC/MS), isoconversional kinetics, master-plots method, and thermodynamic evaluation. The thiourea addition could alter the decomposition behavior, shifting the decomposition peaks from 335 to 348°C for rice straw and 255–266°C for thiourea to 206–241°C and 331–347°C for the blend, indicating intermolecular interactions during co-pyrolysis. Product evolution analysis revealed a transition from oxygenated volatiles (e.g., acetic acid and furan derivatives) to sulfur-containing species such as methanethiol and carbonyl sulfide, demonstrating modified reaction pathways induced by thiourea. Thermokinetics analysis showed that the average E_a of the blend (200 kJ mol⁻¹) exceeded those of individual rice straw (157 kJ mol⁻¹) and thiourea (103 kJ mol⁻¹), reflecting kinetic restructuring and the formation of thermally stabilized intermediates. Master-plots analysis identified a three-dimensional phase-boundary (R3) mechanism as dominant at conversions below 0.65, with deviations at higher conversions due to multi-step reactions. Linear correlations between apparent activation energy and pre-exponential factor indicated the occurrence of kinetic compensation effect, while thermodynamic study revealed the enthalpy–entropy compensation, with compensation temperatures matching experimental conditions. The positive values for enthalpy change (140–201 kJ mol⁻¹) and Gibbs free energy change (141–109 kJ mol⁻¹) indicating the non-spontaneous nature of these conversions. These results provided integrated kinetic, thermodynamic, and mechanistic insights into sulfur–biomass interactions during co-pyrolysis and offered guidance for controlling sulfur transformation in biomass-derived carbonaceous materials.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"195 ","pages":"Article 107647"},"PeriodicalIF":6.2,"publicationDate":"2026-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146074406","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}

{"title":"Mechanism study on the influence of moisture on the distribution of typical gases during non-caking coal pyrolysis based on ReaxFF","authors":"Jie Cui,&nbsp;Zengchao Feng","doi":"10.1016/j.jaap.2026.107635","DOIUrl":"10.1016/j.jaap.2026.107635","url":null,"abstract":"<div><div>To reveal the regulatory mechanism of moisture on the distribution of typical gases during non-caking coal pyrolysis, a single-molecule model of non-caking coal was constructed and optimized based on characterization test results, with the molecular formula C₁₇₉H₁₄₂N₂O₄₉. Four pyrolysis systems (ZR, ZQ-5 %H₂O, ZQ-15 %H₂O, and ZQ-25 %H₂O) were designed, and ReaxFF MD simulations were performed on the pyrolysis process under different final temperature conditions using a three-stage simulation strategy. The results indicate that the total mass fraction of pyrolysis gases gradually increases with the rise of moisture content. Temperature is the core regulatory factor for the generation of typical gases, while the effect of moisture is temperature-dependent. Below 3000 K, moisture inhibits CO₂ formation and promotes CH₄/C₂H₄/H₂ generation; above 3000 K, it exerts a promoting effect on all gases. Moisture significantly regulates the time sequence of gas generation and exerts differential impacts on the formation pathways of various gases: the yields of C₂H₄ and H₂ increase with increasing moisture content, CO₂ is less affected, and CH₄ shows a dual response of \"generation-consumption\". This study provides theoretical support for optimizing the non-caking coal pyrolysis process and directionally regulating gas products, and offers important reference value for the clean conversion of low-rank coal.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"195 ","pages":"Article 107635"},"PeriodicalIF":6.2,"publicationDate":"2026-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146074413","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}

{"title":"5-Hydroxymethylfurfural (HMF) generation from hydrothermal liquefaction of algal modeling compound: A comprehensive investigation on the experimental exploration and formation mechanism","authors":"Chenyu Yang,&nbsp;Feiyu Zou,&nbsp;Yishao Ma,&nbsp;Haoxi Ben,&nbsp;Zhaoying Li,&nbsp;Yan He","doi":"10.1016/j.jaap.2026.107648","DOIUrl":"10.1016/j.jaap.2026.107648","url":null,"abstract":"<div><div>The reaction mechanism for the selective conversion of algal polysaccharides into platform chemicals such as 5-hydroxymethylfurfural (HMF) during hydrothermal liquefaction (HTL) remains unclear, which hinders process optimization. To address this issue, this study selected <span>L</span>-rhamnose, <span>D</span>-glucuronic acid, and <span>D</span>-glucose as model compounds. An integrated approach combining microwave-assisted HTL experiments, deuterium isotope tracing, and quantum chemical calculations was employed to investigate the reaction mechanism. In the microwave-assisted glucose HTL experiment, a relative HMF yield exceeding 90 % was achieved. Under optimal conditions of 190 °C for 30 min, the relative content of HMF reached 96.3 %. When the reaction temperature was further increased or the reaction time prolonged, secondary conversion of HMF to furfural (FF) was initiated. Deuterium tracing experiments using GC-MS and ¹H NMR confirmed that hydrogen atoms on hydroxyl-bearing carbons in HMF preferentially undergo deuterium exchange, indicating site-specific dehydration in carbohydrate conversion. Based on density functional theory calculations, four formation pathways for 5-hydroxymethylfurfural and two formation pathways for furfural were proposed, and their thermodynamic parameters were systematically evaluated. Pathway 4 for HMF and Pathway 6 for FF were identified as the most favorable due to their lower energy barriers and advantageous thermodynamic properties. This study clarifies the bond cleavage preferences and reaction network mechanisms of algal-specific carbohydrates under HTL conditions. The findings provide important theoretical insights for optimizing algal HTL parameters and establish a basis for understanding selective regulation in carbohydrate thermochemical conversion.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"195 ","pages":"Article 107648"},"PeriodicalIF":6.2,"publicationDate":"2026-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146074510","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}

{"title":"Preparation of N-rich doped bamboo-derived carbon electrode materials by multi-effect activation and multi-source N doping strategy: A high-yield, green synthesis method","authors":"Wenchang Yue ,&nbsp;Zhaosheng Yu ,&nbsp;Hongyu Liu ,&nbsp;Zejie Zheng ,&nbsp;Xiaojing Wang ,&nbsp;Zhuoyao Chen ,&nbsp;Xiaoqian Ma","doi":"10.1016/j.jaap.2026.107650","DOIUrl":"10.1016/j.jaap.2026.107650","url":null,"abstract":"<div><div>Due to their controllable pore structure and tunable surface active sites, biomass-derived carbon materials were a potential low-cost electrode material for supercapacitors. However, traditional technology relied on high-concentration K salts or KOH activators and chemical heteroatom dopants, which defied the principles of sustainable development. This study introduced a green and innovative method for preparing N/O/S co-doped carbon materials through the multi-effect activation of organic K salts enhancing multi-source heteroatom doping. During carbonization process, C₈H₄KNO₂ achieved a triple effect: chemical pore-making by K vapor, physical pore-expansion by CO₂, and alkaline etching by NH₃. During this process, the heteroatom enrichment was achieved through multi-source doping (self-doping of biomass and gas-solid reactions between NH₃ and carbon materials). The synergistic interaction between biomass and C₈H₄KNO₂ resulted in precise regulation of the N-5, N-6, and C-O content. Among them, the optimized KPBS-1 exhibited outstanding specific surface area (1110.35 m²/g), abundant N, O, and S active sites (total content: 20.17 %), and exceptional carbon yield (40.40 %). At 0.5 A/g, KPBS-1 demonstrated a capacitance of 336.75 F/g while achieving a volumetric performance of 376.03 F/cm³. The assembled button-type supercapacitor (KPBS-1//KPBS-1) realized a high energy density of 15.65 Wh/kg and demonstrated superior long-term cycling stability (93.44 % capacitance retention after 60,000 cycles). DFT calculations indicated that particular functional groups (N-5, N-6, and C-O active sites) significantly enhanced adsorption capacity for K⁺. This study provided valuable reference for the future development of high-yield, environmentally friendly, low-pollution, surface-functionalized carbon-based supercapacitor electrode materials.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"195 ","pages":"Article 107650"},"PeriodicalIF":6.2,"publicationDate":"2026-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146074408","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}

{"title":"Waste-derived hierarchical porous carbon with tunable sp2/sp3 hybridization from pyrolyzed Poly (ethylene terephthalate)/oyster shell for high-performance lithium-ion battery anodes","authors":"Jinlong Zhuo ,&nbsp;Xian Wang ,&nbsp;Chuanyue Yang ,&nbsp;Weirun Li ,&nbsp;Xu Yao ,&nbsp;Jingwen Sun ,&nbsp;Kang Lv ,&nbsp;Xiansen Tao ,&nbsp;Jingquan Sha","doi":"10.1016/j.jaap.2026.107642","DOIUrl":"10.1016/j.jaap.2026.107642","url":null,"abstract":"<div><div>Porous carbon (PC) with tunable carbon hybridization states and controllable nanostructure are critically important for high-performance energy storage. However, their synthesis often requires expensive precursors, graphitization catalysts, or complex activation processes. Herein, we report a sustainable and template-free strategy to fabricate hierarchically porous carbon (PC-x, x = 800, 900, and 1000 °C) with controllable sp²/sp³ carbon ratio by utilizing waste oyster shells as a calcium source and discarded Poly (ethylene terephthalate) (PET) bottles as a low-cost terephthalic acid ligands precursor. Through a facile one-pot route, Ca-based metal-organic frameworks (Ca-MOFs) were constructed and subsequently pyrolyzed at different temperatures to obtain PC-x without any external catalyst. Mechanistic investigations suggest that elevated temperature promotes sp³-to-sp² conversion and structural ordering, thus enhancing graphitic domains and electronic conductivity. As a result, the optimized PC-900 as anode for lithium-ion batteries exhibits an exceptional specific capacity of 2057.2 mA·h·g⁻¹ at 0.1 A·g⁻¹ after 200 cycles, along with a rate capacity of 1381.9 mA·h·g⁻¹ at 1.0 A·g⁻¹ after 350 cycles and 559.2 mA·h·g⁻¹ at 10.0 A·g⁻¹ after 1000 cycles. Furtherly, the Li⁺ migration kinetics, storage mechanisms and structure evolution of PC-900 are systematically analyzed. This work not only develops a sustainable strategy to convert plastic and biological waste into high-performance carbon anodes, but also establishes clear structure-property correlations between carbon hybridization, nanostructure evolution, and electrochemical performance, providing mechanistic guidance for the rational design of sustainable carbon anodes.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"195 ","pages":"Article 107642"},"PeriodicalIF":6.2,"publicationDate":"2026-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146074410","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}

{"title":"Movable oil content and control mechanisms of laminae assemblages in lacustrine shale system: Insights from multiple pyrolysis experiments of Chang 73 organic-rich shales in the Ordos Basin","authors":"Fuwei Wang ,&nbsp;Dongxia Chen ,&nbsp;Xingjian Wang ,&nbsp;Mengya Jiang ,&nbsp;Renzeng Wanma ,&nbsp;Qiaochu Wang ,&nbsp;Yuchao Wang ,&nbsp;Lanxi Rong ,&nbsp;Yuqi Wang ,&nbsp;Zijie Yang ,&nbsp;Chen Liu ,&nbsp;Khawaja Hasnain Iltaf ,&nbsp;Zhangxin Chen","doi":"10.1016/j.jaap.2026.107645","DOIUrl":"10.1016/j.jaap.2026.107645","url":null,"abstract":"<div><div>Evaluating the movable oil content and control mechanisms in shales is critical for clarifying oil enrichment, sweet spot assessments, and recovery enhancements in shale oil plays. However, research on lacustrine shale systems remains limited due to the development of heterogeneous laminae assemblages. In this study, the laminae assemblage types and their geological features were systematically characterized through direct observation (core and microscope), mineral quantification and elemental analysis, and organic geochemical testing. By combining multitemperature pyrolysis and Rock-Eval analysis before and after solvent extraction, core samples from the Triassic Chang 7₃ submember organic-rich shales in the Ordos Basin were employed to conduct movable oil evaluation and control mechanism analysis, especially the coupling control of in situ geological factors and oil migration factor. The results show that the Chang 7₃ organic-rich shale can be categorized into massive shale (MS), tuffaceous laminated shale (TLS) and felsic laminated shale (FLS) according to the laminae assemblages. The typical feature of organic-rich TLS samples is a high movable oil content but a low movable oil proportion. Instead, despite having a slightly lower movable oil content, organic-lean FLS samples exhibit the typical characteristics of a high movable oil proportion and better mobility. The movable oil characteristics of different laminae assemblages are controlled by both in situ geological factors and oil migration. Specifically, the organic geochemical features were positively correlated with the movable oil content but negatively correlated with the movable oil proportion. The pore structure controls the movable oil content more strongly than the movable oil proportion, whereas the inorganic composition, especially clay minerals, has a greater impact on movable oil proportion. Moreover, shale oil migration tends to reduce the movable oil content in the oil-expelling unit and significantly increases the movable oil content in the oil-receiving unit, thus contributing to movable oil enrichment in the organic-lean laminae assemblages. Consequently, this study establishes the movable oil enrichment patterns of different laminae assemblages under the coupled control of in situ geological factors and oil migration factors, which can provide guidance for sweet spot evaluation and achieve cost-effective shale oil development.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"195 ","pages":"Article 107645"},"PeriodicalIF":6.2,"publicationDate":"2026-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146074407","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}

{"title":"CO2-driven suppression of toxic aromatic formation during pyrolysis of acrylic fabric waste","authors":"Chohee Yang ,&nbsp;Taewoo Lee ,&nbsp;Young-Min Kim ,&nbsp;Doyeon Lee ,&nbsp;Eilhann E. Kwon","doi":"10.1016/j.jaap.2026.107644","DOIUrl":"10.1016/j.jaap.2026.107644","url":null,"abstract":"<div><div>Given the non-biodegradable nature of synthetic textiles, their thermal treatment (incineration) presents a promising route to mitigate environmental issues associated with microfiber generation. However, this approach is hindered by the formation of toxic aromatic compounds, especially characterized when heteroatoms are present in the polymer backbones. To address this challenge, this study proposes a pyrolytic valorization of acrylic fabric waste (AFW) while using carbon dioxide (CO₂) as a detoxifying agent to suppress the toxic aromatic byproducts. Compositional analysis of AFW revealed the presence of 85 wt% polyacrylonitrile (PAN) and 15 wt% polyvinyl acetate (PVA). Pyrolysis of AFW yielded a complex mixture of volatile products, predominantly AN-derived oligomers and their aromatic derivatives; however, direct interactions between these intermediates and CO₂ were limited. To activate the reactivity of CO₂, an <em>ex-situ</em> catalytic system using a nickel (Ni)-based catalyst was integrated to the conventional pyrolysis. The Ni catalyst facilitated the cyclization and aromatization of AN-derived oligomers, while the formed aromatics were partially oxidized by CO₂ into carbon monoxide (CO), suppressing the aromatic analogues. Increasing the catalyst-bed temperature from 500 to 700 ˚C enhanced CO₂ activation and promoted the conversion of aromatics to CO. At catalyst-bed temperature of 700 ˚C, catalytic pyrolysis under CO₂ exhibited a 35.9 % reduction in toxic aromatic formation compared to pyrolysis under nitrogen environment. Overall, this work demonstrates a sustainable strategy for AFW disposal with elucidating the mechanistic role of CO₂ in transforming toxic aromatic species into detoxified gaseous products, primarily CO.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"195 ","pages":"Article 107644"},"PeriodicalIF":6.2,"publicationDate":"2026-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146074411","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}

{"title":"Hydrogenation liquefaction behavior and catalytic mechanism of Naomaohu coal-derived asphaltenes over different catalysts","authors":"Ying Zhu ,&nbsp;Mei Zhong ,&nbsp;Yang Liu ,&nbsp;Zhenghua Dai ,&nbsp;Lijun Jin ,&nbsp;Yalkunjan Tursun ,&nbsp;Shikun Li","doi":"10.1016/j.jaap.2026.107641","DOIUrl":"10.1016/j.jaap.2026.107641","url":null,"abstract":"<div><div>To elucidate the conversion mechanism of Naomaohu coal-derived asphaltenes (NMH-ASP) in the high-temperature stage during the two-stage liquefaction (TSL) process, various catalysts, including Fe₂O₃, α-FeOOH, iron stearate (FeSA) and NiMo/γ-Al₂O₃, were presulfurized at low-temperature to reveal the effect of their active phase on liquefaction performance and products selectivity. The results showed that NMH-ASP conversion and oil yield dropped in the following order at 430 °C for 60 min: NiMo/γ-Al₂O₃ (85.32 wt%; 71.20 wt%) &gt; FeSA (70.97 wt%; 63.71 wt%) &gt; α-FeOOH (68.79 wt%; 61.50 wt%) &gt; Fe₂O₃ (63.46 wt%; 54.76 wt%). The NiMoS phase from NiMo/γ-Al₂O₃ sulfurization exhibited superior H₂ activation ability, facilitating aromatic-ring hydrogenation and the cleavage of C_al–O and C_ar–O bonds, resulting in deep deoxygenation. Consequently, the liquefied oil showed the highest cycloalkane content (10.39 %) and the lowest oxygen-containing compounds (1.89 %), along with higher CO₂ content (1.50 wt%) in the gas. The Fe_1-xS phase of FeSA showed smaller, more uniform crystallite sizes, promoting the cleavage of aliphatic side chains and C_al–C_al bonds, leading to increased formation of chain alkanes (20.82 %) and C₁–C₄ gases (2.34 wt%). α-FeOOH-derived Fe_1-xS enhanced solvent hydrogen transfer to free radical fragments and promoted C_al–C_ar dealkylation, resulting in a higher benzene series content (29.62 %). However, the Fe_1-xS phase of Fe₂O₃ exhibited lower efficiency in C_ar–O bond cleavage, leading to the accumulation of phenols (8.21 %) and a higher content of the naphthalene series (43.49 %) due to insufficient aromatic-ring hydrogenation. This work provides theoretical guidance for catalyst design and process optimization in TSL.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"195 ","pages":"Article 107641"},"PeriodicalIF":6.2,"publicationDate":"2026-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146074409","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}

{"title":"Effect of pyrolysis conditions induced char structure transformation on hydrogasification process","authors":"Donghai Hu ,&nbsp;Meijie Du ,&nbsp;Guoqiang Cao ,&nbsp;Jiantao Zhao ,&nbsp;Jiejie Huang ,&nbsp;Chunyu Li ,&nbsp;Yitian Fang","doi":"10.1016/j.jaap.2026.107643","DOIUrl":"10.1016/j.jaap.2026.107643","url":null,"abstract":"<div><div>As a promising route for coal to synthetic natural gas (SNG) conversion, hydrogasification enables direct methane production with high thermodynamic efficiency. The strategic design of char properties through controlled pyrolysis represents a crucial pathway for optimizing coal hydrogasification processes. This work systematically examines how pyrolysis temperature (600–900 °C), pressure (0.1–4 MPa), and atmosphere (N₂ vs. H₂/N₂) collectively engineer the carbon structure of Zhundong coal chars and govern their performance in subsequent hydrogasification process. The result reveals that H₂ actively participates in the pyrolysis stage, enhancing devolatilization and direct CH₄, C2 and tar formation, and fundamentally restructuring the carbon matrix. At 800 °C, the <em>I</em>_G<em>/I</em>_ALL value of the hydrogenated pyrolysis char is 0.16, which is 15.8 % lower than that of the N₂-pyrolyzed char, indicating a more defective carbon structure. This structural modification results in a carbon framework enriched with active sites, thereby facilitating the subsequent hydrogasification process. Additionally, increasing pressure significantly affects the gasification reactivity of hydrogenated pyrolysis char, which attributed to the high graphitization of the produced carbon. During long-term hydrogasification, these structurally tailored chars also exhibit a superior and sustained CH₄ production, attributed to their enhanced active site and developed pore network that alleviates diffusion limitations. Importantly, a coherent reaction route linking pyrolysis conditions to char structural properties and gasification performance was established, providing fundamental insights for optimizing the two-stage coal-to-SNG process.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"195 ","pages":"Article 107643"},"PeriodicalIF":6.2,"publicationDate":"2026-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146074513","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}

{"title":"Co-pyrolysis of discarded disposable tableware and bamboo chopsticks: The effect of synergistic interactions on kinetic parameters and products","authors":"Jinbao Zhang ,&nbsp;Yangyifan Zhang ,&nbsp;Huaqing Li ,&nbsp;Ya Liu,&nbsp;Fengfu Yin","doi":"10.1016/j.jaap.2026.107640","DOIUrl":"10.1016/j.jaap.2026.107640","url":null,"abstract":"<div><div>This study systematically investigates the co-pyrolysis behavior of a ternary system composed of polypropylene (PP), polystyrene (PS), and disposable bamboo chopsticks (DC), focusing on its pyrolysis characteristics, kinetic synergistic effects, and product distribution mechanisms. The reaction process was analyzed using thermogravimetric analysis (TGA), tubular furnace experiments, and GC-MS combined with various kinetic methods. The results indicate that co-pyrolysis exhibits a significant synergistic effect, with an apparent activation energy of 108.98 kJ/mol, markedly lower than the theoretical value of 217.31 kJ/mol. The kinetic mechanism follows a random nucleation and growth model (<em>A</em>_1/2). The pyrolysis oil yield reaches 67.33 %, exceeding the theoretical value of 64.78 %. Product analysis indicates that co-pyrolysis effectively promotes deoxygenation reactions and the formation of aromatic hydrocarbons. The relative contents of naphthalene derivatives, such as 1,2,3,4-tetrahydro-2-phenyl-naphthalene, and phenyl-alkene compounds are significantly increased, with the total aromatic hydrocarbon content rising by 26.54 %, while the content of oxygenated compounds is markedly reduced. Mechanistic analysis indicates that the synergistic deoxygenation primarily results from hydrogen transfer reactions and Diels–Alder pathways, effectively enhancing the quality of pyrolysis oil. This study provides a robust theoretical basis and a feasible process route for the co-pyrolysis of multi-component waste to produce high-value chemicals.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"195 ","pages":"Article 107640"},"PeriodicalIF":6.2,"publicationDate":"2026-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146024621","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}