Article
Chemistry, Applied
Prakhar Arora, Hoda Abdolahi, You Wayne Cheah, Muhammad Abdus Salam, Eva Lind Grennfelt, Henrik Radberg, Derek Creaser, Louise Olsson
Summary: The HDO activity of NiMo catalysts in bio-based feedstocks was evaluated in the presence of catalyst poisons, with a focus on contaminants like Fe, P, and metals. Calcination treatment was studied for recovering the activity of spent catalysts. Fe was found to have the most deactivating effect, with Fe deposits found to a depth of 100 μm regardless of concentration.
Article
Chemistry, Physical
Tianqi Chen, Ohhun Kwon, Renjing Huang, Chao Lin, John M. Vohs
Summary: Decorating the surface of a Ni catalyst with WOx enhances the HDO selectivity of m-cresol, indicating the reaction proceeds via a direct HDO pathway. XPS analysis shows synergistic interactions between WOx and Ni help maintain a high concentration of oxygen vacancies in monolayer WOx.
JOURNAL OF CATALYSIS
(2021)
Article
Energy & Fuels
Asma Zitouni, Redouane Bachir, Wahiba Bendedouche, Sumeya Bedrane
Summary: Bio-based difurfurylidene acetone was utilized as a renewable feedstock for the production of jet fuel range hydrocarbons through the hydrodeoxygenation process. By examining the Si/Zr ratio and Ni content, excellent results in terms of activity and selectivity were achieved towards the formation of bio-jet fuel range hydrocarbons C13-C16. The catalyst's performances were found to be influenced by the nature and the strength of the support acidity, as well as the metal-support interaction.
Article
Chemistry, Physical
Ping He, Qisong Yi, Huawei Geng, Yuanchao Shao, Meng Liu, Zhijie Wu, Wenhao Luo, Yuanshuai Liu, Valentin Valtchev
Summary: This study developed highly dispersed subnanometric Ru metal clusters encapsulated in MWW zeolites for the HDO of lignin-derived phenolic compounds, showing high activity and stability in an apolar liquid phase. The close proximity between Ru metal clusters and Bronsted acid sites confined in zeolite constraints delivers a synergistic effect, leading to enhanced catalytic activity and product selectivity. The super stability of the ultrafine Ru metal clusters against sintering and leaching after successive catalytic runs is achieved, providing a prototype for the design of superior catalysts for other energy-related transformations.
Article
Chemistry, Multidisciplinary
Kai Yan, Dengwei Wang, Hao Li
Summary: Developing novel and efficient hydrodeoxygenation (HDO) catalysts is crucial for biomass utilization from green and sustainable perspectives. Carbon materials have been recognized as ideal catalyst carriers, but recently, metal/heteroatom-doped carbon catalysts have gained widespread interest due to their superior performance compared to pristine metal/carbon catalysts. Research focuses on synthesis strategies for these catalysts, the effects of heteroatom doping, and their catalytic applications in biomass HDO.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Agricultural Engineering
Tewodros Kassa Dada, Arun Vuppaladadiyam, Alex Xiaofei Duan, Ravinder Kumar, Elsa Antunes
Summary: The effect of a Cu-SrO bimetallic catalyst on the catalytic co-pyrolysis of ironbark and waste cooking oil was investigated. It was found that the catalyst supports had an impact on the yield of aromatic hydrocarbons and the selectivity of different components in the bio-oil. The Cu-SrO/ZSM-5 catalyst significantly increased the production of C8-C14 compounds and reduced compounds over C20.
BIORESOURCE TECHNOLOGY
(2022)
Article
Energy & Fuels
Jun Zhang, Zhen Wu, Yafei Wu, Xiaoling Liu, Xun Li, Yu Zhang, Haian Xia, Fei Wang
Summary: The introduction of Zn species on the HZSM-5 catalyst can significantly improve the performance of catalytic cracking, leading to an increase in the production of aromatics, particularly monocyclic aromatics. Zn species alter the acidity of the catalyst and play a crucial role in the reaction.
Review
Chemistry, Physical
Mingyuan Zhang, Yulin Hu, Haoyu Wang, Haoyang Li, Xue Han, Yimin Zeng, Chunbao Charles Xu
Summary: Fast pyrolysis and hydrothermal liquefaction are considered promising technologies for liquid bio-fuel production, but the poor quality of crude bio-oils has limited their direct applications. Hydrotreatment such as hydrodeoxygenation is a common upgrading technique, and this review explores the effects of different reaction conditions on the HDO treatment of real bio-oil. The underlying mechanisms for bio-oil HDO, technical challenges, and potential solutions are discussed, along with knowledge gaps and future research directions.
MOLECULAR CATALYSIS
(2021)
Article
Chemistry, Physical
Jiangtao Li, Depeng Han, Shuqian Xia
Summary: The introduction of Mo promotes the hydrodehydration of aliphatic alcohol and suppresses the decarbonylation of aliphatic aldehyde, leading to improved reaction selectivity and carbon atom utilization.
Article
Agricultural Engineering
William Lonchay, Giuseppe Bagnato, Aimaro Sanna
Summary: This study evaluates the use of Ce, Na, Pd, and Fe supported on zirconium oxide for the ex-situ hydropyrolysis/hydrodeoxygenation of Etek lignin to selectively produce BTX and cycloalkenes. The Fe/ZrO2 catalyst showed high selectivity and strong deoxygenation ability, resulting in the production of C-5-C-10 hydrocarbons with a carbon distribution of 85.5%.
BIORESOURCE TECHNOLOGY
(2022)
Article
Agricultural Engineering
Shuang Xue, Zhongyang Luo, Haoran Sun, Wanchen Zhu
Summary: In this study, modified bimetallic micro-mesoporous zeolite catalysts were prepared and successfully applied in the process of ex-situ catalytic fast pyrolysis of biomass, leading to an improvement in the quality of liquid fuel. The addition of clay catalysts and the use of a HAP&Zeolite dual catalyst system resulted in a decrease in coke yield. Real-time monitoring showed that the catalytic performance of zeolites began to decrease when the ratio of biomass and catalyst exceeded 1.
BIORESOURCE TECHNOLOGY
(2022)
Article
Chemistry, Applied
Yue-lun Wang, Jun-ping Yu, Hui-hui An, Wen-yuan Jin, Ji-rong Qiao, Yuan Sun, Jing-pei Cao
Summary: A new route for upgrading coal tar to aromatics using ZSM-5 zeolite as catalyst was investigated, with methanol promoting the production of aromatics and inhibiting coke formation. Increasing the methanol/cresol molar ratio led to higher aromatic hydrocarbons yield, produced through providing methyl groups instead of active hydrogen from methanol. Alkylation of methylbenzene with methanol resulted in toluene, xylene, and trimethylbenzene as main products due to steric hindrance of larger molecules.
FUEL PROCESSING TECHNOLOGY
(2021)
Review
Energy & Fuels
Zaiman Zhang, Hao Li
Summary: Water plays various roles in biomass HDO reactions, regulating reaction rates, selectivity, and mass transfer rates. Its effects on different mechanistic features of biomass catalytic HDO reactions can help develop novel catalytic systems for synthesizing renewable chemicals.
Article
Chemistry, Multidisciplinary
Tao Liu, Jingkun Zhao, Xiaodong Zhang
Summary: In this study, in situ and ex situ catalytic pyrolysis techniques were employed for the directional conversion of volatile matter from low-rank coal (LRC). The use of ZSM-5 catalysts resulted in a reduction of tar complexity and an increase in the relative content of valuable compounds such as benzene, toluene, and xylene.
Article
Chemistry, Physical
Shuya Zhang, Xiaochen Liu, Hongqiao Lin, Rong Chen, Yu Chen, Yuanjie Xu, Kaiyang Xu, Huibo Zhao, Li Tan, Lizhi Wu, Yu Tang
Summary: This study investigates a single-atomically dispersed Pd/Fe2O3 catalyst with exceptional HDO activity. At 573 K, anisole conversion reaches 99%, while the selectivity to HDO products is 84%. The turnover rate per Pd atom is 182.2 h-1, significantly higher than that of supported Pd nanoparticles. Additionally, the catalyst exhibits good stability for more than 110 hours of continuous operation.
MOLECULAR CATALYSIS
(2023)
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)