Journal of Analytical and Applied Pyrolysis最新文献_第9页

Catalytic pyrolysis-gasification of contaminated municipal wastes: Catalyst regeneration 污染城市垃圾的催化热解气化：催化剂再生

IF 6.2 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis

Pub Date : 2026-03-01 Epub Date: 2025-11-29 DOI: 10.1016/j.jaap.2025.107513

Beatrix Csutorás, Viktória Zsinka, Norbert Miskolczi

The aim of this work is to investigate the effect of the catalyst regeneration during thermo-catalytic conversion of municipal solid waste and municipal plastic waste by pyrolysis-gasification. Ni/ZSM-5 catalyst was used to affect the product yields and composition for 10 cycles in the pyrolysis-gasification reaction. The Ni/ZSM-5 catalyst was tested without regeneration, however, to investigate the effect of catalyst regeneration, the Ni/ZSM-5 catalyst was also regenerated after each use. The composition of the gas products was analysed by GC-FID and GC-TCD methods, where the concentration of hydrogen, carbon-monoxide, carbon-dioxide, methane and other volatile hydrocarbons had been detected and changes was discussed. Regarding the pyrolysis oil, the single ring and polyaromatic content had been analysed by HPLC. The surface properties and the morphology of the used catalyst was also studied to follow the catalyst deactivation. Based on the results, the BET surface of the used catalyst decreased by 31.0 % through the consecutive repeated applications, when municipal solid waste was utilized and the catalyst was not regenerated. However, it decreased only by 16.2 % when the catalyst was regenerated between the repeated applications. When municipal plastic waste was pyrolyzed, the decrease were 15.3 % and 8.0 %, respectively. In order to compare the main properties and the effects of the regenerated and non-regenerated catalysts during the pyrolysis-gasification process, a comparative analysis was made, while a SWOT analysis was studied on the step of regeneration.

研究了热催化转化城市固体废物和城市塑料废物热解气化过程中催化剂再生的影响。采用Ni/ZSM-5催化剂对热解-气化反应进行了10次循环，影响了产物的产率和组成。Ni/ZSM-5催化剂在不进行再生的情况下进行了测试，为了考察催化剂再生的效果，Ni/ZSM-5催化剂在每次使用后也进行了再生。通过气相色谱- fid和气相色谱- tcd分析了气相产物的组成，检测了氢、一氧化碳、二氧化碳、甲烷和其他挥发性碳氢化合物的浓度并讨论了变化。对热解油进行了单环和多芳烃含量的HPLC分析。对催化剂的表面性能和形貌进行了研究。结果表明，在不再生且利用城市生活垃圾的情况下，通过连续重复使用，所使用催化剂的BET表面降低了31.0 %。然而，当催化剂在重复使用之间再生时，它只下降了16.2 %。对城市塑料垃圾进行热解处理，分别减少15.3 %和8.0 %。为了比较再生催化剂和非再生催化剂在热解-气化过程中的主要性能和效果，进行了对比分析，并对再生步骤进行了SWOT分析。

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引用次数: 0

Kinetic and mechanism analysis of thermal decomposition of hexafluorobisphenol A-containing polyarylates 含六氟双酚a聚芳酯的热分解动力学及机理分析

IF 6.2 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis

Pub Date : 2026-03-01 Epub Date: 2025-11-29 DOI: 10.1016/j.jaap.2025.107512

Xiubo Long , Zhoufeng Wang , Wenlong Yao , Wenchi Zhang , Puxi Zheng

This research thoroughly examined the kinetics of thermal decomposition as well as the pyrolysis mechanism of a fluorinated polyarylate (PBR-F). From thermogravimetric analysis (TG), it was found that PBR-F-50 and PBR-F-80, which had a high content of hexafluorobisphenol A (BPAF), had a three-stage thermal decomposition characteristic, while on the contrary, PBR-F-20, which had a low content of BPAF monomer units, had only one stage. The kinetic assessment of thermal decomposition was conducted using the Friedman, Flymn-Wall-Ozawa (F-W-O), Kissinger-Akahira-Sunose (K-A-S), and integral Master-Plot techniques. Ultimately, the average activation energies for PBR-F-20, PBR-F-80 Stage 1, and PBR-F-80 Stage 2 were found to be 187.35 kJ/mol, 214.27 kJ/mol, and 271.26 kJ/mol, respectively. In addition, the pyrolysis mechanism function for PBR-F-20 and PBR-F-80 Stage 1 was F₁, while that for PBR-F-80 Stage 2 was R₂. By analyzing the thermally decomposed gaseous compounds of PBR-F and demonstrated that the polar functional group –CF₃ weakens the stability of the ester group and makes it more susceptible to bond breakage. However, some BPAF segments broke first and absorbed a lot of energy, delaying the breakage of the polymer backbone. The remaining segments were gradually and steadily released from the polymer as the temperature increased, thereby enhancing the thermal stability of PBR-F. Through thermal decomposition kinetics and mechanism analysis, the mechanism of two-stage pyrolysis for a novel fluorinated polyarylate (PBR-F) was revealed.

本研究对含氟聚芳酸酯（PBR-F）的热分解动力学和热解机理进行了深入的研究。通过热重分析（TG）发现，六氟双酚a （BPAF）含量高的PBR-F-50和PBR-F-80具有三级热分解特性，而BPAF单体单元含量低的PBR-F-20只有一级热分解特性。采用Friedman、Flymn-Wall-Ozawa （F-W-O）、Kissinger-Akahira-Sunose （K-A-S）和Master-Plot积分技术进行热分解动力学评价。最终，PBR-F-20、PBR-F-80第一阶段和第二阶段的平均活化能分别为187.35 kJ/mol、214.27 kJ/mol和271.26 kJ/mol。PBR-F-20和PBR-F-80第一阶段的热解机制函数为F1， PBR-F-80第二阶段的热解机制函数为R2。通过分析PBR-F的热分解气态化合物，证明极性官能团-CF3削弱了酯基的稳定性，使其更容易断键。然而，一些BPAF片段首先断裂，吸收了大量的能量，延缓了聚合物主链的断裂。随着温度的升高，剩余的片段逐渐稳定地从聚合物中释放出来，从而增强了PBR-F的热稳定性。通过热分解动力学和机理分析，揭示了新型氟化聚芳酸酯（PBR-F）的两段热解机理。

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引用次数: 0

Nonlinear evolutionary characteristics and early warning methods of coal spontaneous combustion: Implications for coal mine disaster warning 煤炭自燃的非线性演化特征及预警方法：对煤矿灾害预警的启示

IF 6.2 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis

Pub Date : 2026-03-01 Epub Date: 2025-11-25 DOI: 10.1016/j.jaap.2025.107492

Teng Ma , Binbin Ma , Xiaowei Zhai , Bobo Song , Ya-E. Bai , Ling Liu , Haoyu Yang , Weigang Wang , Binbin He , Xiaokun Chen

To reveal the dynamic evolution of coal spontaneous combustion (CSC) and develop an efficient warning method, this study analyzes gas release behavior and the evolution of functional groups during CSC utilizing the self-built program controlled temperature rising apparatus and Fourier transform infrared spectroscopy (FTIR). The results indicate that during the slow-oxidation and critical-temperature stages, oxygen consumption and the release of carbon oxygen gases proceed slowly; during the rapid-oxidation stage, hydrocarbon gases begin to form; whereas in the combustion stage, carbon oxygen gas and hydrocarbon gas are released intensely. Based on the nonlinear characteristics of CSC and the results of Pearson correlation analysis, an early warning method is proposed that adopts CO, C₂H₄, and Graham coefficient as the main indicators, whereas CO₂, O₂, O₂/(CO+CO₂), CO/CO₂, and C₂H₆ serve as auxiliary indicators. By combining the advantages of particle swarm optimization (PSO) and genetic algorithm (GA), a PSO-GA-BPNN prediction model was developed. The model was trained on 112 samples collected from four Jurassic coal seams in northern Shaanxi, with 80 % used for training and 20 % for testing, achieving an RMSE of 5.6429 and an R² of 0.9944, significantly outperforming the other five models. Shapley Additive Explanations (SHAP) analysis was used to quantitatively evaluate the contributions of main and auxiliary indicators to the model predictions, verifying the dominant role of the main indicators in the prediction process. The results provide guidance for safe production and sustainable development of the coal industry, contributing to the achievement of carbon peaking and carbon neutrality goals.

为了揭示煤自燃过程的动态演化规律，建立有效的预警方法，利用自建程控温升仪和傅里叶变换红外光谱（FTIR）对煤自燃过程中的气体释放行为和官能团演化进行了分析。结果表明：在缓慢氧化和临界温度阶段，氧气消耗和碳氧气体释放缓慢；在快速氧化阶段，烃类气体开始形成；而在燃烧阶段，碳氧气体和碳氢气体释放强烈。基于CSC的非线性特点和Pearson相关分析结果，提出了以CO、C2H4和Graham系数为主要指标，CO2、O2、O2/(CO+CO2)、CO/CO2和C2H6为辅助指标的预警方法。结合粒子群算法（PSO）和遗传算法（GA）的优点，建立了PSO-GA- bpnn预测模型。该模型以陕北4个侏罗系煤层采集的112个样本为样本进行训练，以80% %用于训练，20% %用于测试，RMSE为5.6429，R2为0.9944，显著优于其他5个模型。采用Shapley加性解释（SHAP）分析定量评价了主辅助指标对模型预测的贡献，验证了主指标在预测过程中的主导作用。研究结果对煤炭工业的安全生产和可持续发展具有指导意义，有助于实现碳调峰和碳中和目标。

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引用次数: 0

A strategic approach to treat polyester waste: Co-pyrolysis of PET and PBAT for controlling product characteristics and char graphitization 聚酯废弃物处理的策略途径：PET和PBAT共热解控制产品特性和炭石墨化

IF 6.2 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis

Pub Date : 2026-03-01 Epub Date: 2025-12-01 DOI: 10.1016/j.jaap.2025.107527

Seonho Lee , Hansung Lee , Eunhyo Song , Byungmin Ahn , Jechan Lee

This study is aimed at demonstrating pyrolytic behavior of co-pyrolysis of polyethylene terephthalate (PET) and polybutylene adipate terephthalate (PBAT) to propose a method to simultaneously treat a mixed non-biodegradable/biodegradable polyester stream. The co-pyrolysis of PET and PBAT is performed at 500–800 °C. The yields of char and liquid pyrolysate (25 and 22.4 wt%, respectively) are highest at 500 °C, while the yield of gas pyrolysate was highest at 800 °C (18 wt%). Char is the major solid product with yields up to 33 % higher under the co-pyrolysis than under single pyrolysis of PBAT at 800 °C. Structural transformations of the PET/PBAT mixture-derived char depend on pyrolysis temperature. Progressive graphitization with increasing temperature is observed by reduced I_D/G ratios and the appearance of 2D bands. Oxygenated groups (C–O, CO) and formation of C–C or CC bonds are removed with the conversion of PBAT-derived organics, especially at ≥ 700 °C. Micro–mesoporous structures are developed more prominently at higher temperatures. The experimental results should contribute to developing processes achieving the volume reduction of complicated non-biodegradable/biodegradable plastic mixtures and the production of higher quality carbon materials from plastic waste.

本研究旨在验证聚对苯二甲酸乙二醇酯（PET）和聚己二酸丁二醇对苯二甲酸乙二醇酯（PBAT）共热解的热解行为，提出一种同时处理非生物降解/生物降解混合聚酯流的方法。PET和PBAT的共热解在500-800℃进行。焦炭和液态热解产物的产率在500℃时最高（分别为25和22.4 wt%），而气态热解产物的产率在800℃时最高（18 wt%）。焦是PBAT在800℃共热解下的主要固体产物，产率比单热解高出33 %。PET/PBAT混合衍生炭的结构变化取决于热解温度。随着温度的升高，石墨化的过程逐渐发生，其特征是石墨烯/石墨烯比的降低和二维石墨烯带的出现。含氧基团（C - o， CO）和形成的C - C或CC键随着pbat衍生有机物的转化而被去除，特别是在≥ 700°C时。微介孔结构在高温下更为突出。实验结果将有助于开发减少复杂的非生物可降解/生物可降解塑料混合物体积的工艺，以及从塑料废物中生产更高质量的碳材料。

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引用次数: 0

A novel insight on coke quality: A new approach and index for evaluating coke thermal properties under simulated blast furnace condition 焦炭质量的新认识：模拟高炉条件下焦炭热性能评价的新方法和新指标

IF 6.2 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis

Pub Date : 2026-03-01 Epub Date: 2025-12-10 DOI: 10.1016/j.jaap.2025.107548

Zhexi Li , Mingxin Wu , Yongqiang Jiang , Tingle Li , Sunny Song , Junchen Huang , Songtao Yang , Qi Wang , Changyu Sun

Coke thermal properties is a key factor in assessing its quality, directly affecting blast furnace (BF) performance. Currently, NSC(Nippon Steel Corporation) and its derivative method(variable temperature and gas conditions) are most commonly used. However, coke with significantly different CRI and CSR can still perform well in BF operations without negatively impacting efficiency. This raises questions about the accuracy of NSC-based methods. Therefore, there is an urgent need for a more accurate evaluation method. In this study, field coke samples are tested under simulated BF conditions (BFC). The reliability of BFC method was validated by comparing results with BF dissection data, and the limitation of NSC-based method are clarified. Based on these findings, two new evaluation indices CAI and CPI are proposed to better assess coke thermal properties. Regression analysis between the new indices and theoretical coke ratio (K_BFC) demonstrated their scientific validity and practical feasibility. Key findings include: BFC method accurately reflects coke solution-loss and degradation behavior under real BF conditions, showing strong consistency with BF dissection results. The temperature and gas conditions used in NSC-based methods are limited, leading to overestimation of low CRI/high CSR coke and underestimation of high CRI/low CSR coke in thermal properties. The new indices provide significantly different evaluations compared to CRI and CSR. The correlation coefficients between CAI/CPI and K_BFC are 0.89 and 0.82, respectively, outperforming the 0.03 and 0.18 obtained by CRI/CSR. BFC method provides a more comprehensive simulation of coke behavior in blast furnace operations, and its derived indexes, CAI and CPI, offer a more accurate assessment of coke thermal properties.

焦炭热性能是评价焦炭质量的关键因素，直接影响高炉的使用性能。目前，NSC（新日铁公司）及其衍生方法（变温度和变气体条件）是最常用的。然而，CRI和CSR差异显著的焦炭在高炉运行中仍能表现良好，而不会对效率产生负面影响。这就对基于nsc的方法的准确性提出了质疑。因此，迫切需要一种更准确的评价方法。在本研究中，现场焦炭样品在模拟高炉条件下进行了测试。通过与高炉解剖数据的对比，验证了BFC方法的可靠性，并指出了基于nsc方法的局限性。在此基础上，提出了两个新的评价指标CAI和CPI，以更好地评价焦炭的热性能。通过对新指标与理论焦炭比（KBFC）的回归分析，验证了新指标的科学有效性和实践可行性。主要发现包括：BFC方法准确反映了真实高炉条件下焦炭的溶失和降解行为，与高炉解剖结果具有较强的一致性。在基于nsc的方法中使用的温度和气体条件是有限的，导致高估了低CRI/高CSR焦炭的热性能，低估了高CRI/低CSR焦炭的热性能。与CRI和CSR相比，新指标提供了显著不同的评价。CAI/CPI与KBFC的相关系数分别为0.89和0.82，优于CRI/CSR的相关系数0.03和0.18。BFC方法可以更全面地模拟焦炭在高炉运行中的行为，其衍生指标CAI和CPI可以更准确地评估焦炭的热性能。

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引用次数: 0

Proton acid density in zeolite USY: A key factor for selective ring-opening in 9, 10-dihydrophenanthrene hydrocracking 沸石中质子酸密度：9,10 -二氢菲加氢裂化中选择性开环的关键因素

IF 6.2 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis

Pub Date : 2026-03-01 Epub Date: 2025-12-05 DOI: 10.1016/j.jaap.2025.107540

Hanqiong Jia , Wenming Hao , Bo Qin , Yanze Du , Jinghong Ma , Ruifeng Li

The conversion of polyaromatic hydrocarbons (PAHs) into benzene, toluene and xylene (BTX) is one of the ways to clean and efficient utilization of fossil fuel. The acid cracking centers of catalyst for catalytic ring-opening reaction of PAHs are widely employed for improving the reaction selectivity and yield. Here, the product pattern and competitive interplay between central and terminal ring opening in 9,10-dihydrophenanthrene (9,10-DHP) hydrocracking are found to be determined by the acid density of USY catalyst. During the initial phase of 9,10-DHP hydrocracking, hydrogenation/dehydrogenation and hydrogen transfer reactions are in competition with the central ring opening (CRO) reaction. The high temperature is in favor of the CRO reaction, while the hydrogenation/dehydrogenation reactions diminish. In a high BAS density range (>179 μmol/g), the selectivity for CRO products notably increases, while the selectivity for tetrahydrophenanthrene declines with the increased density of BAS, the CRO efficiency is over 60 %. The coke deposition is less sensitive when the BAS in the low range (< 179 μmol/g).

多芳烃（PAHs）转化为苯、甲苯和二甲苯（BTX）是清洁高效利用化石燃料的途径之一。多环芳烃开环反应催化剂的酸裂化中心被广泛应用于提高反应选择性和产率。本研究发现，9,10-二氢菲（9,10- dhp）加氢裂化反应的产物模式和中心环开口与末端环开口之间的竞争性相互作用由USY催化剂的酸密度决定。在9,10- dhp加氢裂化的初始阶段，加氢/脱氢和氢转移反应与中心开环（CRO）反应相互竞争。高温有利于CRO反应，而加氢/脱氢反应减弱。在高BAS浓度范围内（>179 μmol/g），对CRO产物的选择性显著提高，而对四氢菲的选择性随BAS浓度的增加而降低，CRO效率可达60 %以上。当BAS浓度较低（< 179 μmol/g）时，焦炭沉积的敏感性较低。

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引用次数: 0

Controllable preparation of biomass-derived activated carbon for targeted adsorption of phenolic substances in crude wood vinegar 生物质源活性炭定向吸附粗木醋中酚类物质的可控制备

IF 6.2 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis

Pub Date : 2026-03-01 Epub Date: 2025-12-28 DOI: 10.1016/j.jaap.2025.107584

Wenqi Chen , Gang Wu , Yinhai Su , Enhui Sun , Huiyan Zhang

Straw pyrolysis yields wood vinegar and biochar, with wood vinegar holding significant agricultural potential due to growth-promoting components (acids, alcohols, ketones) but suffering from phenol-induced biotoxicity that restricts its application. To address this challenge, this study develops a binary activation strategy for the controllable preparation of straw-derived activated carbon (AC) using ZnCl₂ and H₃PO₄ as activators, targeting efficient phenol removal from crude wood vinegar. Notably, the AC synthesized through binary impregnation activation using a 0.1 M mixed solution of ZnCl₂ and H₃PO₄ exhibits an excellent pore structure, abundant oxygen-containing functional groups, and optimal adsorption performance, achieving a phenol removal efficiency of 82.8 % which is significantly higher than those of straw pyrolytic char 3.3 % and single-agent activation 71.8 % for ZnCl₂ and 75.6 % for H₃PO₄. Furthermore, the targeted adsorption mechanism of harmful components was elucidated. The Langmuir isotherm model and pseudo-second-order kinetic model better fit the description of the targeted adsorption process of phenol on activated carbon, corresponding to a monolayer homogeneous adsorption process with abundant active sites. This work provides a sustainable approach for high-value utilization of straw waste, offering theoretical and technical insights into the controllable preparation of high-performance AC adsorbents and efficient refinement of crude wood vinegar.

秸秆热解产生木醋和生物炭，由于木醋具有促进生长的成分（酸、醇、酮），因此具有重要的农业潜力，但由于苯酚诱导的生物毒性，限制了其应用。为了解决这一挑战，本研究开发了一种二元活化策略，以ZnCl2和H3PO4为活化剂，可控制备秸秆衍生活性炭（AC），目的是高效去除粗木醋中的苯酚。值得注意的是，采用0.1 M ZnCl2和H3PO4混合溶液二元浸渍活化合成的活性炭具有优良的孔隙结构、丰富的含氧官能团和最佳的吸附性能，苯酚去除率为82.8 %，显著高于秸秆热解炭的3.3 %和单剂活化ZnCl2的71.8 %和H3PO4的75.6 %。进一步阐明了有害成分的靶向吸附机理。Langmuir等温线模型和拟二级动力学模型较好地拟合了苯酚在活性炭上的靶向吸附过程的描述，对应于一个具有丰富活性位点的单层均匀吸附过程。本研究为秸秆废弃物的高价值利用提供了一条可持续的途径，为高性能AC吸附剂的可控制备和粗木醋的高效精制提供了理论和技术见解。

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引用次数: 0

Chemical recycling of mixed thermoplastics via pyrolysis: A comparative study of feedstock influence and reactor impact 混合热塑性塑料热解化学回收：原料影响和反应器影响的比较研究

IF 6.2 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis

Pub Date : 2026-03-01 Epub Date: 2025-12-23 DOI: 10.1016/j.jaap.2025.107575

Niklas Netsch , Aljoscha Tauber , Orhan Keskin , Britta Bergfeldt , Harald Wehner , Dirk Eidam , Salar Tavakkol , Dieter Stapf

Pyrolysis represents a promising solution for increasing plastic waste recycling rates in a circular economy. The thermal decomposition behavior of pure polymers is well investigated. However, the diverse composition and complex technical reactor conditions pose challenges for the pyrolysis of heterogeneous plastic waste. Therefore, this study examines the pyrolysis of virgin polymers, defined reference mixtures, and post-consumer waste in a scalable stirred tank reactor (STR) compared to an auger-type screw reactor (ASR) at pilot-scale. The results of the STR confirm that simple polymer blends of polyolefins and polystyrene degrade following the decomposition mechanisms of the pure polymer, while heteroatom-containing mixtures exhibit interaction effects. These interactions shift the products from the condensable to the gaseous fraction by up to 22 wt.%. Furthermore, product yields and compositions strongly depend on reactor design and process parameters. The gas residence time and the time-dependent polymer pyrolysis temperature are identified as the main influencing parameters. In this study, interaction effects between different polymers overlap the reactor-specific impact in complex feedstock mixtures, dominating the product yields. The condensate yield in the STR exceeds the results obtained in the ASR by 10–24 wt.% for LDPE, PP, PS, and a mixture of them. In contrast, the STR system yields only up to 6 wt.% more condensates than the ASR system for mixtures containing oxygen, nitrogen, and chlorine. The reactor type has a major impact on condensate quality. The H/C ratio, heteroatom content, and proportion of distillation cuts in the light and middle distillate range vary significantly.

热解是在循环经济中提高塑料废物回收率的一个很有前途的解决方案。研究了纯聚合物的热分解行为。然而，不同的组分和复杂的工艺反应器条件给非均质塑料垃圾的热解带来了挑战。因此，本研究考察了在可扩展搅拌槽反应器（STR）和螺旋反应器（ASR）中试规模下，原生聚合物、确定的参考混合物和消费后废弃物的热解情况。STR的结果证实，聚烯烃和聚苯乙烯的简单聚合物共混物遵循纯聚合物的分解机制降解，而含杂原子的混合物则表现出相互作用效应。这些相互作用使产物从可冷凝组分转变为气态组分，转变幅度可达22% wt.%。此外，产品的产率和组成很大程度上取决于反应器的设计和工艺参数。确定了气体停留时间和随时间变化的聚合物热解温度是主要影响参数。在这项研究中，不同聚合物之间的相互作用效应在复杂的原料混合物中重叠了反应器特定的影响，主导了产品收率。STR的凝析油产率比ASR的结果高出10-24 wt。%用于LDPE、PP、PS及其混合物。相比之下，STR系统仅产生高达6 wt。对于含氧、氮和氯的混合物，冷凝物比ASR系统多%。反应器类型对凝结水质量有重要影响。在轻馏分和中馏分范围内，H/C比、杂原子含量和精馏分比例变化显著。

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引用次数: 0

Synergistic co-pyrolysis of sewage sludge and corn stover using self-sourced biochar catalyst for product valorization without heavy metal risk 利用自产生物炭催化剂对污水污泥和玉米秸秆进行协同共热解，实现产品增值，无重金属风险

IF 6.2 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis

Pub Date : 2026-03-01 Epub Date: 2025-12-18 DOI: 10.1016/j.jaap.2025.107560

Xiaona Lin , Xiaojie Zhuansun , Binbin Tang , Zhen Sun , Hongtao Li , Badr A. Mohamed

The unsustainable management of sewage sludge (SS) poses significant environmental and economic challenges. However, the substantial organic fraction within SS has considerable potential for thermochemical conversion. This study presents a novel strategy that utilizes self-sourced biochar as a catalyst to synergistically enhance the ex-situ upgrading of catalytic co-pyrolysis vapors derived from SS and corn stover (CS) in a mass ratio of 1:1 at 500 °C. The physicochemical properties of biochar, its catalytic performance in reforming co-pyrolysis vapors, and the transformations of heavy metals were comprehensively investigated. The optimal SS-to-CS mass ratio of 2:8 generated nitrogen enriched biochar with enhanced surface area and porosity, which significantly improved the quality of the co-pyrolysis oil. Compared to the non-catalytic process, the phenols content increased significantly from 13.7 % in to 32.1 %, while the acids content decreased from 39.8 % to 22.4 %. The interaction between SS and CS during co-pyrolysis inhibited the formation of nitrogen-containing compounds, and the self-sourced biochar catalyst further reduced their content from a calculated 20.6 % to an experimental 10.0 %. Furthermore, the catalytic co-pyrolysis process stabilized heavy metals through chelation with free radicals, resulting in minimal speciation transformation and low bioaccessibility in the spent biochar catalyst. These findings present a sustainable approach for simultaneous waste valorization and high-value chemicals production, offering dual benefits of resource circularity and risk mitigation.

不可持续的污水污泥管理（SS）带来了重大的环境和经济挑战。然而，SS中的大量有机组分具有相当大的热化学转化潜力。本研究提出了一种新的策略，利用自源生物炭作为催化剂，以1:1的质量比在500°C下协同增强来自SS和玉米秸秆（CS）的催化共热解蒸汽的非原位升级。对生物炭的理化性质、催化共热解蒸汽重整的性能以及重金属的转化进行了全面研究。最佳的ss / cs质量比为2:8时，生成的富氮生物炭表面积和孔隙度均有所增加，显著提高了共热解油的质量。与非催化工艺相比，苯酚含量从13.7 %增加到32.1 %，酸含量从39.8 %下降到22.4 %。在共热解过程中，SS和CS之间的相互作用抑制了含氮化合物的形成，自源生物炭催化剂进一步将含氮化合物的含量从计算值20.6 %降低到实验值10.0 %。此外，催化共热解过程通过与自由基的螯合来稳定重金属，导致废生物炭催化剂的形态转化最小，生物可及性低。这些发现提出了一种同时实现废物增值和高价值化学品生产的可持续方法，提供了资源循环和降低风险的双重效益。

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引用次数: 0

Insight into the pyrolysis behavior of tar-rich coal via infrared fast heating 红外快速加热研究富焦油煤的热解行为

IF 6.2 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis

Pub Date : 2026-03-01 Epub Date: 2025-12-21 DOI: 10.1016/j.jaap.2025.107569

Yongming Xin, Qian Zhang, Chen Liu, Yinping Wang, Zeyu Peng, Yu Jia, Wei Huang

Fast pyrolysis has attracted considerable attention for coal conversion owing to its capacity to shorten reaction time and enhance tar yield, while the influence of the reaction conditions on the pyrolysis behavior remains inadequately quantified. Here, an infrared fast heating reactor was employed and the effect of coal mass, final temperature and heating rate on product yield and composition of a typical tar-rich coal was thoroughly studied at a larger experimental scale than commonly used (tens of grams instead of milligrams). The results showed that during fast pyrolysis (heating rate 100 ℃/s), with the increase of sample mass from 10 g to 100 g, the volatiles could not be discharged from the reactor in time, and the intensified polycondensation or insufficient pyrolysis caused the gradually decreasing yields of tar and gas. With the increase of final temperature from 500 ℃ to 800 ℃, more chemical bonds were broken, resulting in the generation of more volatiles, and the tar yield increased to a peak and then decreased, while the gas yield gradually increased. The high temperature increased the secondary cracking and polycondensation reactions, which could also be confirmed by the decrease of the aliphatics and the increase of naphthalenes, anthracene, and PAHs in the tar. Under certain conditions (large sample masses, high final temperatures), fast pyrolysis can produce tar yields comparable to or even lower than those from slow pyrolysis, which challenges the widespread assumption that fast pyrolysis always maximizes tar yield. The investigation of the heating rate further demonstrated that an appropriate heating rate was beneficial for the increase of tar yield. This study concluded that lower sample mass and optimal final temperature were conducive to increasing the tar yield during fast pyrolysis, which was expected to provide valuable insights for fast pyrolysis research.

快速热解因其能够缩短反应时间和提高焦油收率而备受关注，但反应条件对热解行为的影响尚未得到充分的量化。本文采用红外快速加热反应器，在比常用的（几十克而不是毫克）更大的实验规模上，深入研究了煤的质量、最终温度和加热速率对典型富焦油煤的产率和组成的影响。结果表明：在快速热解（升温速率100℃/s）过程中，随着样品质量从10 g增加到100 g，挥发分不能及时排出反应器，缩聚加剧或热解不充分导致焦油和气体的产率逐渐降低。随着终温从500℃升高到800℃，更多的化学键断裂，产生更多的挥发物，焦油收率上升到一个峰值后又下降，气收率逐渐增加。高温增加了焦油的二次裂解和缩聚反应，脂肪族的减少和萘、蒽、多环芳烃的增加也证实了这一点。在一定条件下（样品质量大，最终温度高），快速热解产生的焦油产率可以与慢热解相当甚至更低，这挑战了快速热解总是使焦油产率最大化的普遍假设。加热速率的研究进一步表明，适宜的加热速率有利于提高焦油收率。本研究认为，较低的样品质量和最佳终温度有利于提高快速热解过程中的焦油收率，为快速热解研究提供有价值的见解。

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引用次数: 0