Article
Green & Sustainable Science & Technology
Hongliang Sun, Dongdong Feng, Yijun Zhao, Shaozeng Sun
Summary: Regulating operating parameters is crucial for biomass pyrolysis polygeneration. This study investigated the biochar catalytic reforming of corn straw pyrolysis tar using a two-stage reaction system. The effects of pyrolysis temperature, catalytic temperature, and steam content were analyzed, and the most suitable operating parameters were determined. It was found that higher pyrolysis temperature led to decreased tar yield and increased yields of CH4, CO, and H2. The addition of steam significantly reduced the tar yield and promoted methane steam reforming and the water-gas shift reaction, resulting in increased H2 yield.
Article
Energy & Fuels
Yiming Wang, Yang Li, Guijin Wang, Jialong Zhu, He Yang, Lijun Jin, Song Hu, Haoquan Hu
Summary: This study investigates the catalytic upgrading of coal pyrolysis volatiles using nickel catalysts supported on red mud. The results show that the loading of nickel improves the physical and chemical properties of red mud, resulting in improved tar quality and decreased content of heavy components.
Article
Energy & Fuels
Yujie Hou, Zongqing Bai, Hao Lu, Zhihao Feng, Tingting Zhang, Yuxing Jia, Zhenxing Guo, Lingxue Kong, Jin Bai, Wen Li
Summary: Low-cost kaolin modified by calcination and leaching was used as a catalyst for in-situ upgrading of Hami coal pyrolysis volatiles. The results showed that the modification process enhanced the formation of micro-/mesopores and acid sites, resulting in an increase in the light tar fraction and aromatic content in the tar. Acid-modified kaolin has the potential to be an inexpensive and efficient catalyst for upgrading coal pyrolysis tar.
Article
Thermodynamics
Shilin Du, Rui Shu, Feiqiang Guo, Songbo Mao, Jiaming Bai, Lin Qian, Chengyun Xin
Summary: In this study, porous coal char-based catalysts were prepared using coal gangue and lignite with high metals content for biomass tar decomposition. The CO2 etching and metal exposure improved the catalysts' porosity, enhancing adsorption and contact with reactants. The coal gangue char prepared at 800 degrees C exhibited the highest catalytic activity. At a reforming temperature of 700 degrees C, CG-800 achieved a high tar conversion efficiency and total syngas yield.
Article
Energy & Fuels
Elise Farah, Emile Atallah, Belal J. Abu Tarboush, Joseph Zeaiter
Summary: Metal-modified catalysts were tested for the catalytic pyrolysis of olive cake, resulting in increased gas yield, decreased oil yield, and increased carbonization of solid samples.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Energy & Fuels
Jian Cheng, Min Xie, Li Xu, Lei Zhang, Xiaohan Ren
Summary: The increased emissions of hydrogen chloride (HCl) from biomass combustion in utility boilers can lead to corrosion problems. Pyrolysis and co-pyrolysis of corn straw and lignite coal were studied to address this issue, with co-pyrolysis significantly affecting chlorine release from fuel. Oxygen was found to promote HCl release in moderate-temperature pyrolysis compared to pyrolysis under a nitrogen atmosphere.
Article
Chemistry, Analytical
Yuanjun Che, Kunmou Shi, Qian Wang, Ruiyuan Tang, Yuanyu Tian
Summary: This research proposes a relay catalytic upgrading method that combines vacuum residue fast pyrolysis and pyrolysis vapor catalytic cracking. By investigating the composition and molecular distribution of the pyrolysis vapor of Changqing vacuum residue (CQ-VR), it is found that the optimal reaction temperature for CQ-VR pyrolysis process is 600 degrees Celsius. Catalytic cracking of the pyrolysis vapor shows that Z-C catalyst achieves the highest yield of light olefins.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
Article
Energy & Fuels
Mingjin Xia, Jialong Zhu, Baoyong Wei, Haoquan Hu, Lijun Jin
Summary: Commercial activated carbon was modified using steam activation and chemical activation for the catalytic upgrading of heavy coal tar. The modified activated carbon significantly increased the total surface area and promoted the formation of mesopores, leading to improved upgrading performance.
Article
Energy & Fuels
Guang-Hui Liu, Zhi-Wen Zhang, Xia-Long Li, Yu-Hong Kang, Cui-Ying Lu, Jin-Zhong Chen, Fang-Jing Liu, Hong-Cun Bai, Xian-Yong Wei
Summary: A novel magnetic nickel ferrite nanosphere prepared by hydrothermal treatment was used for catalyzing the hydrocracking of extraction residue from lignite, resulting in high yield of arenes. The introduction of NiFe2O4 led to an increase in soluble portion yield and relative content of arenes, as well as a decrease in arenol content. The ability of NiFe2O4 to degrade high-heteroatom species to low-heteroatom species was confirmed, indicating its effectiveness in catalytically hydrocracking lignite and upgrading derived soluble portions.
Article
Environmental Sciences
Chongcong Li, Hao Zhang, Xingli Gong, Yan Zhang
Summary: Tar problems are a significant barrier to the development of biomass pyrolysis technology. The use of coal chars derived from in situ pyrolysis and/or partial gasification as catalysts for tar cracking shows promise due to their low cost and easy availability. This study investigates the application of lignite chars as catalysts for biomass tar decomposition, and the results demonstrate that increasing pyrolysis temperature and char/biomass mass ratio promote tar decomposition, while water produced during biomass pyrolysis contributes to tar reforming and char gasification reactions.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Agricultural Engineering
Yuping Ba, Kehui Cen, Liangcai Wang, Dongxia Jia, Tao Kan, Dengyu Chen
Summary: This study investigated the characteristics of biochar and activated carbon obtained from waste wood chips and tar using a two-step process (co-pyrolysis followed by activation). The comprehensive effects of the three co-pyrolysis factors (proportion of tar, pyrolysis temperature, and residence time) on the properties of biochar and activated carbon were studied. The results showed that the co-pyrolysis of waste wood chips and tar had a synergistic effect, resulting in higher biochar yield and higher specific surface area of activated carbon compared to individual pyrolysis of tar and wood chips.
INDUSTRIAL CROPS AND PRODUCTS
(2023)
Article
Thermodynamics
Yuanjun Che, Kunmou Shi, Zihang Cui, Hongchen Liu, Qian Wang, Wei Zhu, Yuanyu Tian
Summary: In this research, a coupling process of fast pyrolysis and catalytic cracking (FP-CC process) is proposed to convert Xinjiang low temperature coal tar (XJ-CT) into high value-added chemicals. The composition of XJ-CT is analyzed by GC-GC/MS, and the results show the relative contents of alkanes, alkenes, aromatics, and oxygen compounds. The performance of XJ-CT fast pyrolysis is evaluated under different reaction temperatures, and the molecular distributions of major groups in pyrolysis vapor with different temperatures are summarized.
Article
Biochemistry & Molecular Biology
Yehya Jaafar, Gian Carlos Arias Ramirez, Lokmane Abdelouahed, Antoine El Samrani, Roland El Hage, Bechara Taouk
Summary: This study investigates the catalytic co-pyrolysis of beech wood with polystyrene to enhance liquid oil production. Various zeolite catalysts modified with iron and/or nickel were used, and the liquid oil was analyzed for composition and quantity. The Fe/Ni-ZSM-5 catalyst exhibited the best deoxygenation capability, resulting in a high heating value liquid oil composed mainly of aromatics.
Article
Energy & Fuels
Baoyong Wei, Yang Li, He Yang, Haoquan Hu, Mei Zhong, Lijun Jin, Jiaofei Wang
Summary: This study conducted a novel process for integrating lignite pyrolysis volatiles upgrading with methane dry reforming using Ni-Ce bimetallic catalysts in a fixed-bed reactor. The results showed that the Ni-7Ce/Y catalyst exhibited better catalytic performance in terms of increasing light tar yield, selectivity to light aromatics, resistance to coke deposition, and removal of heteroatoms in tar.
Article
Chemistry, Analytical
Qinlin Yang, Qiuxiang Yao, Duo Ma, Yongqi Liu, Lei He, Ruishi Zhou, Ming Sun, Xiaoxun Ma
Summary: The catalytic co-pyrolysis of coal and hydrogen-rich substances can improve the yield and quality of coal tar. This study investigated the effects of hematite, chalcopyrite, nickel laterite, and molybdenite catalysts on the product distribution of coal-tar slurry. The addition of catalysts reduced the apparent activation energy of the pyrolysis process and promoted the generation of oxygen-containing compounds and aromatics. The presence of natural minerals enhanced the formation of light tar.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
Article
Chemistry, Analytical
Guanshuai Zhang, Shanjian Liu, Dongmei Bi, Zhisen He, Jia Liu, Yinjiao Liu
Summary: Hydrogen peroxide pretreatment was applied for fast pyrolysis of corn stalks, and it was found that the pretreatment effectively promoted lignin depolymerization and decreased the reaction activation energy. The pretreatment also increased the cellulose content and removed alkali and alkaline earth metals from the biomass. The pH of the hydrogen peroxide solution affected the removal of lignin and ash by the pretreatment, and the composition of bio-oil changed significantly, with a significant increase in the relative content of levoglucosan after pretreatment.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2024)