Enara Fernandez , Maider Amutio , Maite Artetxe , Gartzen Lopez , Laura Santamaria , Julian E. Lopez , Martin Olazar , Juan F. Saldarriaga
{"title":"Exploring the potential of fast pyrolysis of invasive biomass species for the production of chemicals","authors":"Enara Fernandez , Maider Amutio , Maite Artetxe , Gartzen Lopez , Laura Santamaria , Julian E. Lopez , Martin Olazar , Juan F. Saldarriaga","doi":"10.1016/j.jaap.2024.106817","DOIUrl":"10.1016/j.jaap.2024.106817","url":null,"abstract":"<div><div>The pyrolysis of five invasive plants crowded in Colombia (<em>Liquidambar styraciflua, Sambucus nigra, Cecropia telenitida, Ruta greveolens,</em> and <em>Clusia orthoneura</em>) has been studied for the first time in order to assess their potential for the production of liquid and solid fuels and chemical products. The volatiles produced from the fast pyrolysis of these biomass species at three different temperatures (500, 600 and 700 ºC) were analyzed by Py-GC/MS. In spite of the different nature of the feedstock, the bio-oil produced from the pyrolysis of all the biomasses at the three temperatures studied is mainly composed of phenols (with a relative content in the 19–26.5 % range), acids (14.6–19.5 %), ketones (13.4–19.2 %) and levoglucosan (6.7–15.4 %). Temperature has a moderate effect, leading to a decrease in the relative content of all component families, except aldehydes and hydrocarbons, when it is increased. Biochars produced at 500 ºC show high calorific values, as well as low H/C and O/C ratios, which prove their high stability in the soil. These results are clear evidence that the valorization of these invasive plants by pyrolysis may be an effective strategy for the mitigation of their associated impacts.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"183 ","pages":"Article 106817"},"PeriodicalIF":5.8,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142444598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ling Tan , Chao Long , Hongfei Lai , Xiaowei Huo , Wenjia Yu , Guotong Wei , Ting Tong , Chaoyu Tian
{"title":"Biochar: Preserving the long-term catalytic activity of biosynthesized PdNPs/AuNPs in Cr(VI) reduction","authors":"Ling Tan , Chao Long , Hongfei Lai , Xiaowei Huo , Wenjia Yu , Guotong Wei , Ting Tong , Chaoyu Tian","doi":"10.1016/j.jaap.2024.106816","DOIUrl":"10.1016/j.jaap.2024.106816","url":null,"abstract":"<div><div>Palladium nanoparticles (PdNPs) and gold nanoparticles (AuNPs) synthesized within yeast biomass can be effectively preserved in yeast biochar while maintaining their catalytic activity. Herein, we observe well-preserved PdNPs/AuNPs within yeast biochars, alongside the retention of cell morphology. Notably, the crystal structures of AuNPs within biochars exhibit similarity to that of uncarbonized samples, suggesting minimal influence of carbonization on nanoparticle structure. XPS analysis reveals the transformation of organic bacterial cells into heterocyclic aromatic-carbon material during pyrolytic carbonization. Chemical states analysis indicates the prevalence of metallic Pd(0)/Au(0) with limited PdO<sub>x</sub>/AuO<sub>x</sub> content in yeast biochars. FTIR analysis highlights increased aromaticity of biochars with typical bands for aromatic ring, and new bands appeared in Pd/Au-loaded biochars possibly attribute to PdO<sub>x</sub>/AuO<sub>x</sub>. Moreover, yeast biochars exhibit significantly improved Cr(VI) removal capacities compared to yeast biomass. Specifically, we detect complete removal within 18 h for CYPd and CYPdG biochars, contrasting with less than 65 % removal efficiency in yeast biomass. These findings underscore the potential of carbonization in enhancing the long-term catalytic activity of biosynthesized PdNPs/AuNPs for efficient Cr(VI) reduction, offering promising avenues for environmental remediation strategies.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"183 ","pages":"Article 106816"},"PeriodicalIF":5.8,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142433677","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}
Lichao Ge , Lei Yao , Yang Wang , Mingjin Zuo , Yanquan Liu , Kefeng Wu , Weixuan Zhang , Chang Xu
{"title":"The preparation, layered characterization and potential applications of corncob biochar","authors":"Lichao Ge , Lei Yao , Yang Wang , Mingjin Zuo , Yanquan Liu , Kefeng Wu , Weixuan Zhang , Chang Xu","doi":"10.1016/j.jaap.2024.106808","DOIUrl":"10.1016/j.jaap.2024.106808","url":null,"abstract":"<div><div>To investigate the characteristics of biochar produced from different parts of corncob, biochar was prepared using corncob as a raw material at constant temperatures of 500 °C, 600 °C, and 700 °C, and the biochar was divided into three parts based on its macroscopic structure: an inner layer (CC-N), a middle layer (CC-Z), and an outer layer (CC-W). The composition and physicochemical changes of the biochar samples were evaluated via FTIR, XRD, Raman, and SEM. The results revealed that the microstructure of corncob is heterogeneous, with CC-N resembling withered leaves, CC-Z resembling blocks, and CC-W resembling sheets. The specific surface area and average pore size of the biochar significantly decreased from the inner layer to the outer layer. The functional group structures of the three parts of the biochar are similar, but the infrared spectrum of CC-N has the greatest peak intensity. The degree of graphitization and thermal stability of CC-N were lower than those of CC-Z and CC-W. Higher-temperature pyrolysis promoted the graphitization of char and improved its thermal stability. This research provides important theoretical support for the preparation of activated carbon and high-quality solid biofuels from different layers of corncob.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"183 ","pages":"Article 106808"},"PeriodicalIF":5.8,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142433679","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}
Balaji Sridharan , Ilse Oude Nijeweme , Erwin Wilbers , Gerco Gerritsen , Josef G.M. Winkelman , Robbie H. Venderbosch , Hero J. Heeres
{"title":"Conversion of kraft lignin to hydrocarbons using an integrated molten salt pyrolysis/catalytic hydrotreatment approach","authors":"Balaji Sridharan , Ilse Oude Nijeweme , Erwin Wilbers , Gerco Gerritsen , Josef G.M. Winkelman , Robbie H. Venderbosch , Hero J. Heeres","doi":"10.1016/j.jaap.2024.106813","DOIUrl":"10.1016/j.jaap.2024.106813","url":null,"abstract":"<div><div>Thermochemical conversion of underutilized lignocellulosic streams such as kraft lignin from the pulp and paper industry has the potential to produce sustainable chemicals and biofuels. We here report a process to continuously convert softwood-based lignoboost lignin to hydrocarbons using a three-step approach: i) liquefaction/dispersion of the lignin in a suitable molten salt, ii) pyrolysis of the liquefied/dispersed lignin in a molten salt mixture (ZnCl<sub>2</sub>, KCl, and NaCl), to obtain a crude lignin oil and iii) upgrading of the lignin oil using a catalytic hydrotreatment to yield hydrocarbons. Step 1 and 2 were integrated using a twin screw extruder with different heating sections at a scale of 20 g/h lignin input. Besides char, a lignin oil, mainly composed of monomeric phenolics, and propylene were the major products. The highest yield of the latter two products was around 32 wt% (23 wt% crude lignin oil and 9 wt% propylene). The lignin oil was subsequently converted to hydrocarbons using a two-step catalytic hydrotreatment approach (stabilization step using CoMo/Al<sub>2</sub>O<sub>3</sub> catalyst and a further deep hydrotreatment over a NiMo/Al<sub>2</sub>O<sub>3</sub> catalyst). The final liquid product contained less than 0.5 wt% of oxygen and was shown to be rich in (cyclo)alkanes and aromatic hydrocarbons. The carbon yield for the overall conversion of lignin to hydrocarbons was 23 %.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"183 ","pages":"Article 106813"},"PeriodicalIF":5.8,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142536052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Wang-mi Chen , Bei-dou Xi , Mei-ying Ye , Ming-xiao Li , Jia-qi Hou , Yu-fang Wei , Cheng-ze Yu , Fan-hua Meng , Xin Dai
{"title":"Nickel doped enhanced LaFeO3 catalytic cracking of tar for hydrogen production","authors":"Wang-mi Chen , Bei-dou Xi , Mei-ying Ye , Ming-xiao Li , Jia-qi Hou , Yu-fang Wei , Cheng-ze Yu , Fan-hua Meng , Xin Dai","doi":"10.1016/j.jaap.2024.106825","DOIUrl":"10.1016/j.jaap.2024.106825","url":null,"abstract":"<div><div>The transformation of biomass into green energy was pivotal for sustainable development, yet the efficient conversion of biomass-derived tar into hydrogen-rich syngas remained a significant challenge. This study addressed the catalytic demand for hydrogen production from tar, focusing on the development of LaNi<sub>x</sub>Fe<sub>1-x</sub>O<sub>3</sub> perovskites as catalysts. A series of LaNi<sub>x</sub>Fe<sub>1-x</sub>O<sub>3</sub> perovskites with varying nickel doping levels (x=0, 0.25, 0.5, 0.75, 1) were synthesized to evaluate their catalytic performance in converting toluene, a representative tar component, into hydrogen. The LaNi<sub>0.5</sub>Fe<sub>0.5</sub>O<sub>3</sub> catalyst demonstrated the highest hydrogen yield (14.5 L/6 h) and volume percentage (82.9 V/V%), highlighting the optimal nickel doping level for enhancing hydrogen production. The hydrogen production performance of LaNi<sub>x</sub>Fe<sub>1-x</sub>O<sub>3</sub> was significantly affected by nickel doping. In particular, a small amount of nickel doping can significantly enhance the hydrogen production capacity of LaFeO<sub>3</sub> and maintain good reaction stability. The enhanced performance was attributed to the high oxygen storage capacity of perovskite, which facilitated the removal of surface carbon and promotes the methanation reaction. Notably, the total content of defect oxygen and surface adsorbed oxygen/hydroxyl groups significantly impacted the hydrogen production efficiency. These findings indicated that LaNi<sub>0.5</sub>Fe<sub>0.5</sub>O<sub>3</sub> was an effective catalyst for converting biomass-derived tar into hydrogen-rich syngas, offering a promising solution to the catalytic demand in the hydrogen production system.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"183 ","pages":"Article 106825"},"PeriodicalIF":5.8,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142536056","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}
Zhantao Song , Xiong Zhang , Xiaoqiang Li , Junjie Zhang , Jingai Shao , Shihong Zhang , Haiping Yang , Hanping Chen
{"title":"Machine learning assisted prediction of specific surface area and nitrogen content of biochar based on biomass type and pyrolysis conditions","authors":"Zhantao Song , Xiong Zhang , Xiaoqiang Li , Junjie Zhang , Jingai Shao , Shihong Zhang , Haiping Yang , Hanping Chen","doi":"10.1016/j.jaap.2024.106823","DOIUrl":"10.1016/j.jaap.2024.106823","url":null,"abstract":"<div><div>Predicting and optimizing the physicochemical properties of biochar is crucial for its applications. The characteristics of biomass and pyrolysis conditions are the main factors influencing these properties. However, the numerous components of biomass and the pyrolysis conditions contribute to the substantial challenge in predicting the physicochemical properties, particularly the specific surface area and the nitrogen content of biochar. In this work, machine learning methods including random forest (RF), gradient boosting decision tree (GBDT) and extreme gradient boosting (XGB) (all with R<sup>2</sup> exceeding 0.97) were used to predict and analyze specific surface area of biochar (SSA), N content of biochar (N-char), and yield of biochar (Yield-char). Compositions of biomass and pyrolysis conditions were selected as input variables. The partial dependence plot analysis showed the impact way of each influential factor on the target variable and the interactions among these factors in the pyrolysis process. The feature importance of these models indicated that the influencing factors toward predicting three targets (sorted by importance) were specified as follows: pyrolysis temperature, nitrogen content, and fixed carbon for Yield-char; N and ash for N-char; ash and pyrolysis temperature for SSA. This work provided new insights for understanding pyrolysis process of biomass.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"183 ","pages":"Article 106823"},"PeriodicalIF":5.8,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142535447","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}
Romy J. Veersma , Gijs van Erven , Corentin Lannuzel , Sonja de Vries , Mirjam A. Kabel
{"title":"Quantitative 13C-IS pyrolysis-GC-MS lignin analysis: Overcoming matrix effects in animal feed and faeces","authors":"Romy J. Veersma , Gijs van Erven , Corentin Lannuzel , Sonja de Vries , Mirjam A. Kabel","doi":"10.1016/j.jaap.2024.106802","DOIUrl":"10.1016/j.jaap.2024.106802","url":null,"abstract":"<div><div>Recently, a pyrolysis-GC-MS methodology for specific lignin quantification and structural characterisation was developed, relying on the use of uniformly <sup>13</sup>C-labeled polymeric lignin isolate as internal standard (IS). The <sup>13</sup>C-IS py-GC-MS method has been validated for grasses, woods, and applied in various showcases. To study the fate of lignin in animals, this method still requires careful validation in animal feeds and, especially complex faecal samples, hence the aim of this work. Hereto, faecal material was collected from pigs fed with wheat straw as lignin source and subjected to the py-GC-MS analytical platform for thorough examination of IS pyrolysis behaviour in terms of response and structural features. Next, <sup>13C-IS</sup>py-lignin contents and corrected Klason lignin contents were compared. Most importantly, we revealed that pyrolysis behaviour of <sup>13</sup>C-IS lignin and <sup>12</sup>C-sample lignin was differently affected in the faecal matrix, resulting in the ultimate underestimation of <sup>13C-IS</sup>py-lignin contents. In-depth examination and evaluation of matrix constituents showed that predominantly matrix ash was responsible for the effects observed. We further demonstrated that said matrix effects can be overcome by water extraction of the samples prior to analysis. Our validation and approach extend the use of the specific <sup>13</sup>C-IS py-GC-MS methodology for accurate quantitative lignin analysis to biomass samples with complex matrices like pig faeces, and now call for application in future digestibility studies.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"183 ","pages":"Article 106802"},"PeriodicalIF":5.8,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142425733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sumin Gu , Shuai Yan , Jun Feng , Rong Zhang , Xuan Qu
{"title":"Pressurized hydrogasification and cobalt-catalyzed hydrogasification behaviors of naphthalene as a coal-based model compound","authors":"Sumin Gu , Shuai Yan , Jun Feng , Rong Zhang , Xuan Qu","doi":"10.1016/j.jaap.2024.106773","DOIUrl":"10.1016/j.jaap.2024.106773","url":null,"abstract":"<div><div>The pressurized hydrogasification/catalytic hydrogasification behaviors of naphthalene as a coal-based model compound were investigated for the first time in a batch reactor. The composition of products was roundly analyzed by gas chromatography (GC), gas chromatography–mass spectrometer (GC-MS) and laser desorption time-of-flight mass spectrometry (TOF-MS). Based on the product analysis results, the detailed reaction pathways for naphthalene hydrogasification and the effects of cobalt on reaction pathways were elucidated. Naphthalene first destabilized during hydrogasification. Subsequently, the destabilized naphthalene either underwent stepwise hydrocracking by active hydrogen atoms to ultimately produce benzene and methane, or formed naphthalene free radicals to initiate condensation. Cobalt can regulate products distribution to boost methane, benzene and toluene yield by facilitating active hydrogen generation, despite it had a limited ability to facilitate the naphthalene destabilization at temperature below 700 °C. Whereas above 750 °C, cobalt can promote naphthalene destabilization, thereby remarkably enhancing the conversion of naphthalene. Furthermore, cobalt intensified condensation leading to a shift of molecular mass distribution of condensation products from 252 ∼ 500 Da to 750 ∼ 2000 Da. These phenomena supported similar findings in coal catalytic hydrogasification. The rise in temperature, initial H<sub>2</sub> pressure (<em>P</em><sub>0</sub>), and cobalt content all facilitated the cobalt catalyzed naphthalene hydrocracking to gaseous product, with temperature exerting a particularly significant effect. This trend was similar with cobalt catalyzed coal hydrogasification. For example, when temperature increased from 650 ℃ to 750 ℃, naphthalene conversion improved from 21.2 % to 49.6 %, and gas yield rose from 2.6 % to 29.4 % at 1 % Co and 1.3 MPa <em>P</em>₀. The investigation serves to shed light on the molecular-level understanding of the mechanism underpinning coal hydrogasification.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"183 ","pages":"Article 106773"},"PeriodicalIF":5.8,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142359446","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}
Li Jiguang, Cai Xinheng, Hou Huandi, Ren Jiahao, Xu Ke, Wang Wei
{"title":"A new insight into H-donor’s positive effect on thermal cracking process at molecular level","authors":"Li Jiguang, Cai Xinheng, Hou Huandi, Ren Jiahao, Xu Ke, Wang Wei","doi":"10.1016/j.jaap.2024.106776","DOIUrl":"10.1016/j.jaap.2024.106776","url":null,"abstract":"<div><div>Thermal cracking reactions of vacuum residue (VR) at 420 ℃ with different reaction time were carried out to evaluate an industrial H-donor’s effect on thermal cracking process at molecular level. The mass distribution, conversion ratio, asphaltene and coke yields were analyzed to evaluate the changing rules. Aromatic structures of H-donor were analyzed and its typical structures were speculated, and the bond energy of those model compounds were calculated. It can be concluded that the >460℃ fractions from a refinery stream have abundant H-donors. From analyzing the structures of asphaltenes for the feed and products, it can be learned that H-donors not only can modify the asphaltene structures but also can improve the asphaltene solubility.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"183 ","pages":"Article 106776"},"PeriodicalIF":5.8,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142359499","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}
Hong Tian, Xuan Huang, Bin Zhao, Huang Zhang, Shan Cheng, Lei Liu
{"title":"Investigation of the mechanism and interaction of nitrogen conversion during lignin/glutamic acid co-pyrolysis","authors":"Hong Tian, Xuan Huang, Bin Zhao, Huang Zhang, Shan Cheng, Lei Liu","doi":"10.1016/j.jaap.2024.106795","DOIUrl":"10.1016/j.jaap.2024.106795","url":null,"abstract":"<div><div>Biomass pyrolysis has the potential to be transformed into valuable chemicals and fuels. Nitrogenous chemicals exert a substantial influence on the quality of bio-oil. Studying the impact of lignin on the transformation of nitrogen-containing elements in biomass during biomass pyrolysis is crucial for achieving efficient and effective utilization of biomass resources. In this study, tube furnace experiments, thermogravimetric infrared experiments (TG-FTIR), and gas chromatography-mass spectrometry (Py-GC/MS) were used to investigate the interactions of typical lignins (vanillin and syringol), nitrogenous components (glutamic acid), and the effect of lignin on the pyrolysis gas release of glutamic acid and the pyrolysis products during the co-pyrolysis process. In addition, the impact of lignin on the effect of pyrrolidone formation from glutamic acid was investigated in this study in conjunction with quantum chemical calculations. The experimental findings demonstrated that the co-pyrolysis of lignin and glutamic acid resulted in a reduction in the pyrolysis temperature. This reduction facilitated the release of HCN, NH<sub>3</sub>, and CO<sub>2</sub> while notably impeding the formation of nitrogen-containing compounds in the oil. The nitrogen concentration in the pyrolysis oil declined from 97 % to a range of 51.06–79.63 %, and the inhibitory impact decreased as the pyrolysis temperature increased. At an elevated pyrolysis temperature of 800 °C, lignin facilitated the decarboxylation process of glutamic acid, resulting in an increased production of pyrrolidone.Simulation results demonstrated that the lowest energy barrier paths were the dehydration condensation process and the Maillard reaction involving glutamic acid and lignin and their pyrolysis intermediates, with a particular competitive connection between the two pathways. The results explained the interaction mechanism between the two pyrolysis products and provided a fundamental theoretical basis for nitrogen conversion in biomass pyrolysis.</div></div>","PeriodicalId":345,"journal":{"name":"Journal of Analytical and Applied Pyrolysis","volume":"183 ","pages":"Article 106795"},"PeriodicalIF":5.8,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142425728","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}