Article
Energy & Fuels
Haifeng Tian, Jiapeng Jiao, Haizhou Tian, Huanhuan He, Fei Zha, Xiaojun Guo, Xiaohua Tang, Yue Chang
Summary: Methanol to aromatics (MTA) is an effective method to produce aromatics through a non-petroleum route, with the acidity and structure of zeolite catalysts being key factors. Different preparation methods and Zn sources significantly influenced the products distribution in the MTA reaction. Steam-assisted crystallization method was found to improve the crystallinity and pore structure of the ZnZ8 catalyst.
Article
Chemistry, Physical
Haifeng Tian, Jiapeng Jiao, Fei Zha, Xiaojun Guo, Xiaohua Tang, Yue Chang, Hongshan Chen
Summary: In this study, a ZnZrO solid solution and Zn/Z5 composite catalyst were synthesized and characterized for the hydrogenation of CO2 to aromatics, resulting in improved efficiency and selectivity. Various reaction conditions and catalyst properties were investigated, leading to insights on enhancing the catalytic performance.
CATALYSIS SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Applied
Yasin Khani, Sumin Pyo, Kwang-Eun Jeong, Chul-Ung Kim, Moonis Ali Khan, Byong-Hun Jeon, Kun-Yi Andrew Lin, Siyoung Q. Choi, Young-Kwon Park
Summary: A protonated form of Zeolite Socony Mobil-5 (H-ZSM-5) catalyst was synthesized through a hydrothermal method using different sources of silica. The effect of loading the catalyst with yttrium, samarium, and gadolinium on the acidic properties was investigated. Among the metal-loaded catalysts, the Sm/LHZ catalyst showed the best performance in the methanol to propylene conversion due to its high amount of weak and intermediate acid sites, while the Gd-LHZ catalyst increased the selectivity towards ethane and propane.
Article
Chemistry, Multidisciplinary
Bing Zhu, Haibo Li, Xue Wang, Subing Fan, Junmin Lv, Tian-sheng Zhao
Summary: The [Zn,Mo]/HZ-5 catalysts were prepared using the impregnation method, and the effect of Mo content on catalytic performance was investigated. The catalysts were characterized by various techniques, and it was found that coaromatization process had higher aromatics yield and better stability. The modification with Mo species regulated the acidity of Zn/HZ-5 and increased the amount of Zn(OH)(+) species, resulting in improved dehydroaromatization ability and higher aromatics yield. The carbon deposit and deactivation behaviors were also studied, and under the optimized conditions of 470°C and WHSV = 1.0 h(-1), the BTEX yield reached a maximum of 64.0%.
REACTION CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Physical
Anna Liutkova, Hao Zhang, Jerome F. M. Simons, Brahim Mezari, Marta Mirolo, Gustavo A. Garcia, Emiel J. M. Hensen, Nikolay Kosinov
Summary: The presence of Ca2+ in zeolite catalysts modifies the local environment inside micropores, resulting in enhanced propylene selectivity in the methanol-to-hydrocarbons (MTH) process. Ca/ZSM-5 exhibits strong adsorption of water, hydrocarbons, and oxygenates, which occupy up to 10% of the micropores during the MTH reaction. This change in effective pore geometry affects the formation of hydrocarbon pool components and directs the MTH reaction towards the olefin cycle.
Article
Chemistry, Physical
Nao Tsunoji, Ryota Osuga, Masumi Yasumoto, Toshiyuki Yokoi
Summary: Phosphorus-modified CHA zeolites showed enhanced catalytic performance and prolonged catalyst lifetime in the methanol-to-olefin reaction, with maintained ethene and propene selectivities. Increasing degree of phosphorus modification led to greater retention of non-aromatic hydrocarbons in the catalysts relative to aromatic ones, suggesting that suppression of excess oligomerization of hydrocarbon species contributes to a longer catalyst lifetime.
APPLIED CATALYSIS A-GENERAL
(2021)
Article
Chemistry, Physical
Rui Feng, Bao Liu, Peng Zhou, Xinlong Yan, Xiaoyan Hu, Min Zhou, Zifeng Yan
Summary: The preparation of ZSM-5 samples using a two-stage crystallization method in the presence of glucose and additional post-treatment can improve catalytic performance and product selectivity. Nanosized ZSM-5 catalysts enriched in Al pairs at channel intersections exhibit higher aromatics and ethylene selectivity, while microsized ZSM-5 catalysts with multiple single Al sites show higher propylene selectivity.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Chemistry, Physical
Brandon L. Foley, Blake A. Johnson, Aditya Bhan
Summary: Formaldehyde, formed during methanol-to-hydrocarbon conversion, reacts with organic species causing catalyst deactivation. Olefins may react with formaldehyde in nondeactivating pathways, while aromatics and dienes lead to deactivation. Dienes have a higher propensity for deactivation via formaldehyde-mediated reactions, indicating their critical role in catalyst deactivation in MTH conversion.
Article
Chemistry, Physical
S. Hadi Alaei, Farhad Khorasheh, M. Reza Jafari Nasr, Mehdi Arjmand
Summary: Extensive experimental data were used to develop a comprehensive kinetic model for the methanol to propylene (MTP) process over a ZSM-5 catalyst. Preliminary experiments were performed to determine the reaction conditions that would ensure the absence of external and internal mass transfer resistances. The kinetic experiments were subsequently carried out at 420-500 degrees C under conditions where mass transfer limitations were absent. A detailed reaction network was proposed for the MTP process based on the experimental product distribution and various reported kinetic models in the literature.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Peipei Xiao, Yong Wang, Kengo Nakamura, Yao Lu, Trees De Baerdemaeker, Andrei-Nicolae Parvulescu, Ulrich Muller, Dirk De Vos, Xiangju Meng, Feng-Shou Xiao, Weiping Zhang, Bernd Marler, Ute Kolb, Ryota Osuga, Maiko Nishibori, Hermann Gies, Toshiyuki Yokoi
Summary: The synthesis of efficient Cu-exchanged AEI zeolite catalyst is a crucial prerequisite for achieving continuous and efficient production of methanol from methane.
Article
Energy & Fuels
Tomas Cordero-Lanzac, Andres T. Aguayo, Ana G. Gayubo, Javier Bilbao
Summary: The simulation of the BTH process in reactors with different catalyst regimes showed varying product yields and distribution under different conditions, highlighting the potential for maximizing olefin or gasoline production in specific temperature, space time, and water content settings.
Article
Chemistry, Multidisciplinary
Hongchao Liu, Wenliang Zhu, Xudong Fang, Shichao Peng, Mingguan Xie, Zhaopeng Liu, Zhiyang Chen, Mao Ye, Zhongmin Liu
Summary: This study experimentally demonstrates the synergistic effect of external acidity and surface barriers in the catalytic synthesis of aromatics. The selectivity of products is controlled by external acidity, while the lifetime of the catalyst is controlled by surface barriers. By simultaneously passivating the external acidic sites and reducing the surface barriers, the BTX selectivity was enhanced by 133% and the catalyst lifetime was prolonged.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
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, Applied
Dehong Zeng, Gangli Zhu, Chungu Xia
Summary: The development of high-performance aromatization catalysts for C4 hydrocarbons has been driven by the increasing demand in the aromatics market. The importance of metal active sites, acidic sites, and pore structure of the catalyst for aromatization of light hydrocarbons has been recognized for enhancing catalyst performance.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Jianyu Sun, Yuhang Tian, Jifeng Cao, Qilun Huang, Zilin Fang, Zhenzhou Ma, Xu Hou, Enxian Yuan, Tingting Cui
Summary: This study explores the effects of ethanol on n-heptane catalytic cracking over HZSM-5 zeolites. Ethanol addition promotes alkene selectivity but accelerates HZSM-5 deactivation.
NEW JOURNAL OF CHEMISTRY
(2022)
