Journal of Analytical and Applied Pyrolysis最新文献

{"title":"Effects of different olefinic active species on molecular growth of heavy aromatic fraction in deep processing of thermally cracked oil","authors":"Feng Wang ,&nbsp;Shouhui Jiao ,&nbsp;Xiaoqi Zhang ,&nbsp;Ying Yang ,&nbsp;Xiaohan Jin ,&nbsp;He Liu ,&nbsp;Zongxian Wang ,&nbsp;Aijun Guo","doi":"10.1016/j.jaap.2025.107294","DOIUrl":"10.1016/j.jaap.2025.107294","url":null,"abstract":"<div><div>Although highly reactive olefinic species are abundant in thermally cracked oil, previous studies have predominantly focused on the macroscopic fouling effects of aliphatic olefins during transportation/storage. In contrast, the molecular-level mechanisms by which aromatic olefins promote coking during thermal conversion remained unclear. This work systematically investigated how aromatic olefins drive molecular growth and coke formation of heavy aromatic fractions. Thermal conversion experiments with vacuum residue (VR), resins (Re), and asphaltenes (Asp) mixed with olefin model compounds revealed that aromatic olefins accelerated coking compared to aliphatic olefins, with the coking-promoting effect intensifying as the number of aromatic rings in the molecule increased. At 410°C for 60 min, the addition of 5 wt% 9-vinylanthracene to VR increased the coke yield from 1.35 wt% to 5.72 wt%, versus 1.68 wt% with the addition of 5 wt% 1-octene. Similarly, the addition of 5 wt% 9-vinylanthracene elevated the coke yields for Re and Asp systems from 0.66 wt% and 41.28 wt% to 5.13 wt% and 50.84 wt%, respectively, compared to 1.08 wt% (Re) and 43.36 wt% (Asp) observed with the addition of 1-octene. Model compound system studies demonstrated that, aromatic olefins, unlike 1-octene, could further react with primary addition products formed by their initial co-addition with conventional aromatics, leading to the formation of secondary and high-order addition products. Notably, aromatic olefins exhibited increasing reactivity in continuous co-addition reactions as the number of aromatic rings increased. This was supported by 42.2 % high-order addition products detected in the toluene/9-vinylanthracene system versus 30.1 % in the toluene/styrene system. This study elucidated that aromatic olefin promoted molecular growth through continuous co-addition reactions, ultimately triggering phase separation and coke formation. The findings provided molecular-level insights into the adverse impacts of aromatic olefins on industrial processing of thermally cracked oil.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"192 ","pages":"Article 107294"},"PeriodicalIF":5.8,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144679120","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":"Pyrolysis oil upgrading via hydrotreatment to produce alternative fuel using ZrO2-supported catalysts and isopropanol as a solvent","authors":"Nitchakul Hongloi ,&nbsp;Hossein Jahromi ,&nbsp;Tawsif Rahman ,&nbsp;Sushil Adhikari","doi":"10.1016/j.jaap.2025.107293","DOIUrl":"10.1016/j.jaap.2025.107293","url":null,"abstract":"<div><div>Biomass pyrolysis is a promising approach for sustainable bioenergy production, primarily due to its ability to produce a high amount of liquid. However, the high oxygen content in pyrolysis oil limits its applicability in transportation fuels, necessitating deoxygenation for upgrading. Conventional two-step upgrading processes, involving stabilization and hydrotreatment, can be complex and costly. This study investigates a one-step hydrotreatment of fast pyrolysis bio-oil from pine wood using isopropanol (IPA) as a hydrogen-donating solvent to upgrade pyrolysis oil properties. A comprehensive evaluation was conducted to assess the influence of solvent type (IPA vs. glycerol), hydrogen pressure (500 vs. 1000 psi), and catalyst types (NiMo/ZrO₂, CoMo/ZrO₂, NiMo/Al₂O₃, CoMo/Al₂O₃, Ni/SiO₂-Al₂O₃) on the physicochemical characteristics of the upgraded oil. IPA demonstrated superior performance in increasing carbon content of upgraded oil (from 43.9 % to 68.5 %) and higher heating value (from 17.4 to 31.2 MJ/kg), whereas glycerol promoted greater oxygen removal (up to 89.6 %) under moderate pressure (500 psi) with NiMo/ZrO₂. The effect of hydrogen pressure depends on the catalyst type. Among the evaluated catalysts, NiMo/ZrO₂ demonstrated superior performance for pyrolysis oil upgrading. Thermogravimetric analysis indicated minimal coke formation on NiMo-based catalysts, particularly with ZrO₂ support. Simulated distillation results further emphasized the role of reaction time in maximizing jet fuel-range product yields. Catalyst regeneration experiments confirmed that NiMo/ZrO₂ maintains robust deoxygenation activity over three cycles, with only slight deactivation attributed to coke accumulation. This study offers a practical route for efficient one-step pyrolysis oil upgrading using a non-noble catalyst and IPA.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"192 ","pages":"Article 107293"},"PeriodicalIF":5.8,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144695344","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":"Probing into the factors influencing the catalytic performance of ZnO and its catalytic mechanism in dimethyl methylcyclohexyl-2,4-dicarbamate pyrolysis","authors":"Shutong Pang ,&nbsp;Hualiang An ,&nbsp;Guirong Wang ,&nbsp;Xinqiang Zhao ,&nbsp;Yanji Wang","doi":"10.1016/j.jaap.2025.107290","DOIUrl":"10.1016/j.jaap.2025.107290","url":null,"abstract":"<div><div>The pyrolysis of dimethyl methylcyclohexyl-2,4-dicarbamate (HTDC) is one of the most important steps in the highly selective synthesis of methylcyclohexyl-2,4-diisocyanate (HTDI) through the non-phosgene route. In this work, we found that two commercial ZnO samples showed a distinct catalytic performance in HTDC pyrolysis reaction. With the aid of catalyst characterizations of XRD, SEM, TEM, N₂ adsorption-desorption, XPS, TG/DSC, etc, we are convinced that particle size, specific surface area, crystal plane exposed, and oxygen vacancy concentration are responsible for the catalytic performance of ZnO sample. On this basis, ZnO-catalyzed HTDC pyrolysis reaction process was elucidated by the analyses from both in-situ FTIR and the first-principles calculations. The above investigations demonstrated that employing the ZnO catalyst with suitable oxygen vacancy concentration and achieving a rapid separation of HTDI from the reaction system in the reaction process are the keys to attaining highly selective synthesis of HTDI. The pyrolysis of HTDC proceeds by a predominant adsorption on the ZnO surface through the hydrogen atom of the amino group and the oxygen atom of the methoxy group rather than the carbonyl oxygen. And what’s more, the methyl carbamate group in the para-position is pyrolyzed prefercially compared with that in the ortho-position due to the effect of the steric hindrance of methy group. This work paved a new way to highly selective pyrolysis of HTDC to HTDI.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"192 ","pages":"Article 107290"},"PeriodicalIF":5.8,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144656954","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":"Catalytic upgrading of waste tire pyrolysis volatiles over Ga/ZSM-5 catalysts","authors":"Jinze Dai ,&nbsp;Hongbo Feng ,&nbsp;Bilainu Oboirien ,&nbsp;Sicheng Liu ,&nbsp;Xinyu Zhang ,&nbsp;Zeguang Wu ,&nbsp;Zhaohui Chen ,&nbsp;Shiqiu Gao","doi":"10.1016/j.jaap.2025.107291","DOIUrl":"10.1016/j.jaap.2025.107291","url":null,"abstract":"<div><div>To improve the product distribution of waste tire pyrolysis through catalytic upgrading of pyrolysis volatiles, Ga/ZSM-5 catalysts of various particle sizes (150 nm and 5 μm) and Si/Al ratios (70 and 19) were synthesized and evaluated in a two-stage fixed bed reactor. Insights into the morphological, structural, and compositional features of Ga/ZSM-5 catalysts were obtained using SEM-EDS, XRD, XPS, physisorption, and NH₃-TPD. As compared to non-catalytic pyrolysis, Ga/ZSM-5 catalysts increased the yield of pyrolysis oil from 33.48 % to 39.64 % while boosting the total fraction of aromatics in oil from 62.4 % to &gt; 92 %, exhibiting strong capabilities of converting alkenes to aromatics. In addition, with Ga/ZSM-5 catalysts, the pyrolysis oil contained a significant fraction of benzene and toluene (&gt;19 %), while the fraction of heteroatomic compounds decreased. Specifically, the loading of 3 wt% Ga, the use of nano-sized ZSM-5, and a lower Si/Al ratio enhanced the overall catalytic performance. Moreover, the occurrence of sulfur in pyrolysis products was explored. This work demonstrated Ga/ZSM-5 as effective catalyst for ex-situ catalytic pyrolysis of waste tire.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"192 ","pages":"Article 107291"},"PeriodicalIF":5.8,"publicationDate":"2025-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144656952","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":"Thermochemical recycling of waste glass fiber-reinforced polymers: A research based on experiments and quantum chemical calculations","authors":"Ran Tao ,&nbsp;Yufeng Wu ,&nbsp;Junnan Geng ,&nbsp;Yidi Zhan ,&nbsp;Lijuan Zhao ,&nbsp;Bin Li ,&nbsp;Haoran Yuan ,&nbsp;Jing Gu ,&nbsp;Yong Chen","doi":"10.1016/j.jaap.2025.107277","DOIUrl":"10.1016/j.jaap.2025.107277","url":null,"abstract":"<div><div>The large-scale recycling and resource utilization of waste glass fiber-reinforced polymers (GFRPs) represents a critical challenge constraining the sustainable development of the composite materials industry. In this study, common waste GFRPs, specifically retired wind turbine blades (WTBs), were systematically investigated to elucidate their thermochemical conversion mechanisms and glass fiber regeneration technologies. This approach effectively resolves the existing bottlenecks of low pyrolysis efficiency and unclear reaction mechanisms in current thermal decomposition approaches. Through experimental analysis and density functional theory (DFT) calculations, this study reveals the degradation characteristics of retired WTBs: weight loss occurs between 290 and 500°C with an average apparent activation energy of approximately 170 kJ·mol⁻¹ . A synergistic pyrolysis-oxidation process was developed, achieving 89.5 % pyrolysis efficiency under optimal parameters (pyrolysis temperature: 500°C, pyrolysis time: 80 min, carrier gas flow rate: 50 mL·min⁻¹). Surface-clean glass fibers were successfully obtained via subsequent oxidative treatment (500°C for 80 min), achieving an organic component removal efficiency exceeding 98 %. Mechanistic studies demonstrate that epoxy resin pyrolysis follows a free radical-dominated degradation pathway: initial homolytic cleavage of C-O bonds generates various radical intermediates, which subsequently recombine to form characteristic products including bisphenol A, ethylene oxide, propylene oxide, and propylene. Notably, the presence of glass fibers (SiO₂) significantly reduces C-O bond orders, thereby accelerating resin matrix dissociation. This research provides both theoretical foundations and technical pathways for GFRPs valorization, demonstrating substantial industrial application potential.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"192 ","pages":"Article 107277"},"PeriodicalIF":5.8,"publicationDate":"2025-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144634340","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":"High-temperature pyrolysis of low-density polyethylene for hydrogen production and carbon capture","authors":"Cedric Karel Fonzeu Monguen ,&nbsp;Ahmet Çelik ,&nbsp;Felix Straub,&nbsp;Vanessa Maria Pohl,&nbsp;Jannis Kühn,&nbsp;Patrick Lott,&nbsp;Olaf Deutschmann","doi":"10.1016/j.jaap.2025.107289","DOIUrl":"10.1016/j.jaap.2025.107289","url":null,"abstract":"<div><div>Utilizing low-density polyethylene (LDPE) as a feedstock, non-catalytic thermal pyrolysis represents a promising technology for large-scale hydrogen generation and carbon capture. Furthermore, the use of the solid carbon byproduct generated during the process, enhances the operation’s economic feasibility. This work uses the model compound to reveal the potential of LDPE pyrolysis for producing hydrogen and capturing carbon. A laboratory-scale high-temperature fixed bed reactor is operated in the temperature ranging from 700 °C to 1600 °C, with LDPE pellets of 5 mm in diameter. Despite a decrease in gas yield to 13.7 wt% as the temperature increases, the hydrogen yield significantly increased up to 11.0 wt% from 900 °C to 1600 °C. Approximately two-thirds of the hydrogen present in the polymer was identified as molecular hydrogen in the product gas. At 1600 °C, a purity of 98.5 mol% was achieved for the hydrogen produced, while the product gas at temperatures ranging from 700 °C to 900 °C predominantly contained methane and ethylene. The analysis of the influence of temperature on the condensable product phase demonstrated an increase in the yields of aliphatic and polycyclic aromatic hydrocarbons (PAHs) species up to a temperature of 1000 °C. The decrease in yield of Aliphatic and PAHs from 1000 °C onwards could be attributed to the gradual decarbonization of the gas phase through the formation of solid carbon. Additionally, the produced solid carbon was analyzed using various techniques, including TEM, SEM, DLS, TGA, XRD, and Raman spectroscopy. The results demonstrated its potential as a sustainable industrial carbon material.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"192 ","pages":"Article 107289"},"PeriodicalIF":5.8,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144704014","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":"Exploring the effects of calcium bicarbonate on endogenous phosphorus conversion and pyrolysis product distributions of oil crop residues","authors":"Wei Yang ,&nbsp;Wenbo Hu ,&nbsp;Huihui Liu ,&nbsp;Pengxiao Wang ,&nbsp;Pan Li ,&nbsp;Hui Li ,&nbsp;Zhiwei Wang ,&nbsp;Shuhua Yang ,&nbsp;Zaifeng Li ,&nbsp;Youjian Zhu","doi":"10.1016/j.jaap.2025.107287","DOIUrl":"10.1016/j.jaap.2025.107287","url":null,"abstract":"<div><div>Phosphorus-rich oil crop residues hold significant potential for use as phosphate fertilizers. Pyrolysis can enhance the enrichment of phosphorus in bio-char, although the transformation process remains unclear. To improve the availability of phosphorus and optimize its forms in bio-char, calcium bicarbonate (Ca(HCO₃)₂) was introduced in this study to analyze its effects on the transformation of phosphorus forms and the distribution of pyrolysis products. The addition of Ca(HCO₃)₂ increased the carbon monoxide (CO) content in the pyrolysis gas. Meanwhile, Ca(HCO₃)₂ reduced the acidity of bio-oil while increasing the aliphatic hydrocarbons content. The introduction of Ca(HCO₃)₂ promoted the formation of calcium-phosphorus (Ca-P) compounds. When the addition of Ca(HCO₃)₂ was at 10 %, the content of hydrochloric acid-soluble phosphorus (HCl-P) reached its maximum at 74.3 %, which was advantageous for phosphorus utilization. However, excessive amounts of Ca(HCO₃)₂ can lead to the conversion of HCl-P into residual phosphorus (RP), making it essential to maintain an appropriate proportion. Increasing the pyrolysis temperatures enhanced the lower heating value (LHV) of the gas due to the increased concentration of combustible gases, such as hydrogen (H₂), methane (CH₄), and carbon monoxide (CO). Additionally, the levels of aromatic and aliphatic hydrocarbons in bio-oil increased with rising temperatures, which is significant for subsequent high-value applications. Furthermore, elevated temperatures promoted an increase in the total phosphorus content in bio-char. However, lower temperatures (≤500 ℃) facilitated the reaction between Ca(HCO₃)₂ and organic phosphates, leading to the formation of HCl-P. In contrast, higher temperatures (≥600 ℃) resulted in the conversion of HCl-P to RP.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"192 ","pages":"Article 107287"},"PeriodicalIF":5.8,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144632083","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":"Regulation of pre-pyrolysis on the release of alkali metals during the co-gasification of coal and biomass in visualized fixed-bed coupled with laser-induced breakdown spectrometer system","authors":"Chang Wang ,&nbsp;Chaoyue Zhao ,&nbsp;Jiaofei Wang ,&nbsp;Guozhen Chi ,&nbsp;Yonghui Bai ,&nbsp;Xudong Song ,&nbsp;Weiguang Su ,&nbsp;Peng Lv ,&nbsp;Guangsuo Yu","doi":"10.1016/j.jaap.2025.107286","DOIUrl":"10.1016/j.jaap.2025.107286","url":null,"abstract":"<div><div>The release of alkali metals during the co-gasification of coal and biomass can cause the deposition, slagging, and corrosion of equipment. In this work, the pretreatment of Yangchangwan coal and rice straw via low-temperature pyrolysis was performed to regulate both the release behavior and the release amount of volatiles. The correlation mechanism between the release of volatile matter, the evolution of char physicochemical properties, and the real-time release characteristics of alkali metals during gasification was further investigated using a self-designed visualized fixed-bed coupled with a laser-induced breakdown spectrometer. The results showed that pre-pyrolysis treatment at 300 °C and 450 °C changed the content of volatiles and properties of chars and thus affected the release time and concentration of alkali metals during gasification. The release of volatiles via the short-term (below 15 min) pre-pyrolysis treatment declined the content of C–O–C and C<img>O bonds, thereby promoting the release of alkali metals. When the pre-pyrolysis time exceeded 15 min, the more oxygen-containing groups and the higher structure disorder degree of pre-pyrolysis chars inhibited the release of alkali metals during gasification, reducing the release rate by 8 %. The release of the volatile and the break of oxygen-containing functional groups (C–O–C and C<img>O) were key factors increasing the maximum release concentration of alkali metals during gasification.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"192 ","pages":"Article 107286"},"PeriodicalIF":5.8,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144614007","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 reservoir moisture on underground in-situ pyrolysis of tar-rich coal: Experimental investigation and ReaxFF MD simulation","authors":"Zunyi Yu ,&nbsp;Panxi Yang ,&nbsp;Keming Fu ,&nbsp;Wei Guo ,&nbsp;Hongqiang Li ,&nbsp;Xuanzhi Hao ,&nbsp;Jing Wang ,&nbsp;Bolun Yang ,&nbsp;Bin Zhang ,&nbsp;Tao Xie ,&nbsp;Zhiqiang Wu","doi":"10.1016/j.jaap.2025.107285","DOIUrl":"10.1016/j.jaap.2025.107285","url":null,"abstract":"<div><div>Different moisture content is an important aspect of underground coal seam heterogeneity, which would affect the underground in-situ pyrolysis of tar-rich coal. The pyrolysis characteristics and product distribution of water-bearing tar-rich coal were investigated by the fixed bed pyrolysis experiments. Based on the ReaxFF MD simulation, the pyrolysis characteristics and reaction mechanism were explored from a microscopic perspective. The results showed that the pyrolysis characteristic index (<em>D</em>_<em>i</em>) continued to decrease with increasing moisture content, indicating that H₂O could increase the release difficulty of pyrolysis volatiles. As the moisture content increased from 1 wt% to 15 wt%, the tar yield and lighter tar proportion increased from 4.39 wt% and 49.75 % to 11.95 wt% and 61.25 %. Therefore, the two obtained with higher moisture content would be also higher. The above results showed that H₂O could promote the pyrolysis of coal. The tar yield and lighter tar proportion obtained under the CO₂ atmosphere were further improved. The results of the ReaxFF MD simulation showed that the changing trends of pyrolysis product distribution were consistent with experimental results. The statistical results of chemical bonds showed that H₂O could promote the cracking of C-C and C-O bonds within the pyrolysis system. By analyzing the typical pyrolysis reaction mechanism, the results of pyrolysis experiment and ReaxFF MD simulation were further confirmed. Based on the comprehensive analysis of the above results, it could be concluded that the most suitable reaction conditions for water-bearing tar-rich coal pyrolysis were moisture content: 5 wt%∼10 wt%, N₂ atmosphere.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"192 ","pages":"Article 107285"},"PeriodicalIF":5.8,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144632176","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":"Enhanced tar upgrading and anti-coking performance of Co-Ce bimetallic-loaded EDTA-modified ZSM-5@activated carbon catalyst","authors":"Shijie Ma ,&nbsp;Zhiji Zhang ,&nbsp;Hongyu Zhao ,&nbsp;Yang Hu ,&nbsp;Budeebazar Avid ,&nbsp;Sheng Xue","doi":"10.1016/j.jaap.2025.107282","DOIUrl":"10.1016/j.jaap.2025.107282","url":null,"abstract":"<div><div>The heavy tar components produced during lignite pyrolysis significantly hinder the practical application of coal pyrolysis products due to their high viscosity, low calorific value, and corrosive properties. To improve tar upgrading efficiency and enhance catalyst resistance to carbon deposition, this study developed composite support by combining an EDTA-chelated ZSM-5 molecular sieve with activated carbon. A comprehensive investigation was performed on catalyst systems containing 5 wt% single metals (Co or Ce) and Co/Ce bimetals (total metal loading 5 wt%, Co/Ce mass ratio 1:1). Analyses of catalytic pyrolysis tar and gas products using TG-FTIR and Py-GC/MS demonstrated that the CoCe/C@EZ5 catalyst substantially increased light aromatic selectivity, specifically enhancing the production of high-value BTEXN aromatics (benzene, toluene, ethylbenzene, xylene, and naphthalene) by 47.17 %. Kinetic studies revealed that CoCe/C@EZ5 lowered the activation energy for tar cracking while improving the conversion efficiency of heavy tar components into light aromatics. Characterization through SEM, TEM, XPS, NH₃-TPD, TPO, and Raman spectroscopy confirmed that metal doping achieved simultaneous modulation of surface acid properties, improved redox tolerance, and reduced carbon deposition during reactions, collectively contributing to enhanced catalyst stability. The activated carbon component exhibited two synergistic roles: its hierarchical pore structure effectively adsorbed and dispersed carbon precursors, while oxygen-containing surface groups (e.g., carboxyl and phenolic hydroxyl groups) formed coordination bonds with Co/Ce metal species, thereby improving metal dispersion stability and coking resistance. TPO and Raman spectroscopy analyses demonstrated that incorporating activated carbon alleviated catalyst deactivation caused by carbon deposition, thereby facilitating oxidative removal of the deposited carbon.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"192 ","pages":"Article 107282"},"PeriodicalIF":5.8,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144632175","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}