Article
Energy & Fuels
Huanling Zhang, Huixia Ma, Feng Zhou, Xiaolin Zhu, Guowei Wang, Chunyi Li
Summary: The study demonstrates that using ZSM-5 as a carrier of the Sn-based catalyst leads to high conversion of propane but poor selectivity. The addition of Sn species on the external and internal surfaces of the main channels improves the selectivity for propane dehydrogenation to propene. Furthermore, introducing Na enhances the selectivity of propene.
Article
Engineering, Chemical
Xue Cai, Zitong Zhang, Lili Cai, Xiaoyan Tian, Wending Chu, Weishen Yang
Summary: This study investigates the catalytic performance of Cr2O3/Al2O3 catalysts with different loadings and calcination processes in the dehydrogenation of propane. The results show that the catalysts calcined by air achieved higher propane conversion, while those calcined by H2/Ar exhibited better anticoking ability and resistance against deactivation. The difference in catalytic performance is attributed to the nature of Cr species, the dispersion, and the surface acidity.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Chemistry, Physical
Ge Yang, Xi Yan, Yan Chen, Xiao-Jing Guo, Wan-Zhong Lang, Ya-Jun Guo
Summary: In recent years, Ga-based catalysts have gained much attention in propane dehydrogenation (PDH) reactions due to their environmental friendly nature and low cost. However, achieving high propylene selectivity under harsh reaction conditions remains a challenge. In this study, supported catalysts (Ga-xMg/ZSM-5) were prepared using the sequential impregnation method and applied in the PDH reaction. The results show that the addition of MgO reduces the acidity of the catalysts, promotes the dispersion of Ga2O3, and improves the selectivity of propylene.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Engineering, Chemical
Tianlei Wang, Zhikang Xu, Yuanyuan Yue, Tinghai Wang, Minggui Lin, Haibo Zhu
Summary: A series of PtSn/hierarchical ZSM-5 catalysts were developed for propane dehydrogenation. These catalysts confine PtSn bimetallic particles in the mesopores of hierarchical ZSM-5 zeolite, which are obtained through desilication of conventional ZSM-5. The high efficiency of these catalysts is attributed to the confinement of PtSn particles in the mesopores of hierarchical ZSM-5.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Engineering, Chemical
Huahua Fan, Xiaowa Nie, Chunshan Song, Xinwen Guo
Summary: Using density functional theory calculations, this study investigates the reaction networks and key steps in propane aromatization over Zn/ZSM-5 catalyst. The results show that Zn-Lewis acid sites play a crucial role in propane dehydrogenation, while propene aromatization proceeds under the combined action of Bronsted and Zn-Lewis acid sites. Moreover, introducing a second metal component can promote the removal of carbon deposits, leading to enhanced catalyst stability and more active sites for aromatization.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Energy & Fuels
Guohao Xu, Xuedong Zhu
Summary: The core-shell ZSM-5@MCM-41 catalysts with various shell thickness were synthesized and tested. The results showed that shell growth improves diffusion capacity and prevents carbon deposition, but excessive growth reduces catalytic performance.
Article
Energy & Fuels
Shailesh Dangwal, Anil Ronte, Ghader Mahmodi, Payam Zarrintaj, Jong Suk Lee, Mohammad Reza Saeb, Heather Gappa-Fahlenkamp, Seok-Jhin Kim
Summary: Using a silicalite membrane reactor for propane dehydrogenation (PDH) reaction can achieve high propane conversion and propylene selectivity. Controlling operating conditions, such as increasing reaction temperature and pressure, can effectively enhance reaction performance and reduce the formation of by-products.
Article
Chemistry, Applied
Yueqi Wu, Jiangping Long, Sheng Wei, Yating Gao, Dan Yang, Yihu Dai, Yanhui Yang
Summary: The propane dehydrogenation (PDH) performance of non-noble metal Co-based catalysts can be improved with modified Ti-ZSM-5 zeolites as supports. The enhanced performance is attributed to the tuned state of active Co species and surface acid property due to Ti species. The developed Co/Ti-ZSM-5 catalysts exhibit high selectivity and regeneration stability in recycling PDH reactions. By decreasing the Si/Ti ratio of Ti-ZSM-5 zeolites, the Co sites at different interfaces can be tailored, leading to structural evolution of Ti and improved dispersion and chemical state of the Co sites. Additionally, the high Si/Ti ratio in Ti-ZSM-5 zeolites reduces surface acidity, facilitating C3H6 desorption and enhancing selectivity and anti-coke stability.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Physical
Guohao Xu, Xuedong Zhu
Summary: The core-shell structured Zn/SiO2@ZSM-5 catalyst prepared by a hydrothermal coating method exhibited superior performance in methane co-aromatization, attributed to its unique reaction pathway and the formation of a distinct micro-macroporous system. These features allowed for quick diffusion of desired products and inhibited carbon deposits formation, enhancing methane, propane conversion, and aromatic selectivity, as well as catalytic stability.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Multidisciplinary
Neda Kalantari, Maged F. Bekheet, Parastoo Delir Kheyrollahi Nezhad, Jan O. Back, Ali Farzi, Simon Penner, Nagihan Delibas, Sabine Schwarz, Johannes Bernardi, Dariush Salari, Aligholi Niaei
Summary: In this study, chromium and boron were introduced into the hierarchical structure of ZSM-5 to enhance the catalysts' performance in the methanol-to-propylene process. The crystal structure and orientation of the synthesized zeolites were analyzed, revealing that the introduction of chromium and boron resulted in changes in the crystallinity and symmetry of the zeolites. The impregnated chromium-ZSM-5 catalyst showed superior performance in the production of light olefins, while the introduction of boron further improved the propylene selectivity and ratio.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Article
Chemistry, Physical
Yong Yuan, Raul F. Lobo
Summary: The active sites of Zn/H-ZSM-5 catalysts for propane dehydrogenation were investigated using in situ FTIR spectroscopy and kinetics method. It was found that [Zn-OH](+) and [Zn-O-Zn](2+) sites are more active and selective for the dehydrogenation reaction, while [Zn-OH](+) species sublimate over time leading to catalyst deactivation. The rate-determining step is propane adsorption and dissociation, and H2 desorption is fast.
Article
Chemistry, Physical
Yong Yuan, Raul F. Lobo
Summary: We investigated the active sites of Zn/H-ZSM-5 catalysts for propane dehydrogenation and found that [Zn-OH]+ and [Zn-O-Zn]2+ sites in H-ZSM-5 are more active and selective than isolated Zn2+ sites. The preparation of H-ZSM-5 with abundant Al pairs may be a strategy to form stable and selective Zn/H-ZSM-5 catalysts for propane dehydrogenation.
Article
Chemistry, Applied
Andrey B. Ponomaryov, Andrei Smirnov, Elena Pisarenko, Mikhail Shostakovsky
Summary: The introduction of NaCl improves Pt dispersion and catalyst stability, while washing after calcination further enhances catalyst activity through the redispersion of Pt compounds.
MICROPOROUS AND MESOPOROUS MATERIALS
(2022)
Article
Chemistry, Applied
Alireza Farsad, Shane Lawson, Fateme Rezaei, Ali A. Rownaghi
Summary: The study investigated the influence of Ga, V, and Zr content supported by H-ZSM-5 monolithic catalysts on the catalytic performance of the oxidative dehydrogenation of propane using CO2 as a mild oxidant. Among all synthesized catalysts, 15V-15Zr@ZSM-5 catalyst showed high activity and stability, with a propane conversion of 38% and propylene selectivity of 90%. The introduction of CO2 enhanced catalyst stability and reduced coke formation in the absence of CO2.
Article
Chemistry, Physical
Huaiqi Shao, Qihuan He, Delong Wang, Yongxiang Zhang, Tao Jiang, Xiaoyan Guo
Summary: The CrOx/Zn-Al2O3 catalysts supported on Zn-modified alumina showed uniform foamed pores, high specific surface area, and large pore size. The zinc modification improved the dispersion of Cr6+ species and promoted the formation of active chromate species on the surface, enhancing propane conversion and propylene yield. Additionally, the zinc modifier inhibited the formation of coke deposition, leading to increased catalyst stability.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Chemistry, Physical
Yuan Tong, Man He, Yuming Zhou, Xi Zhong, Lidan Fan, Tingyuan Huang, Qiang Liao, Yongjuan Wang
APPLIED SURFACE SCIENCE
(2018)
Article
Chemistry, Physical
Shuo Zhao, Yiwei Zhang, Yuming Zhou, Yanyun Wang, Kaibo Qiu, Chao Zhang, Jiasheng Fang, Xiaoli Sheng
Article
Chemistry, Physical
Shuo Zhao, Yiwei Zhang, Yuming Zhou, Kaibo Qiu, Chao Zhang, Jiasheng Fang, Xiaoli Sheng
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2018)
Article
Materials Science, Multidisciplinary
Huaying Gao, Yuming Zhou, Xiaoli Sheng, Shuo Zhao, Chao Zhang, Mingyu Zhang
Article
Materials Science, Multidisciplinary
Xi Zhong, Jingang Hu, Yuming Zhou, Man He, Yongjuan Wang, Yuan Tong, Lidan Fan, Zhilan Cai, Qinghua Ding
Article
Chemistry, Applied
Chao Zhang, Yuming Zhou, Yiwei Zhang, Shuo Zhao, Jiasheng Fang, Xiaoli Sheng
APPLIED ORGANOMETALLIC CHEMISTRY
(2018)
Article
Chemistry, Physical
Shuo Zhao, Yiwei Zhang, Yuming Zhou, Chao Zhang, Xiaoli Sheng, Jiasheng Fang, Mingyu Zhang, Yong Yang
APPLIED SURFACE SCIENCE
(2017)
Article
Chemistry, Applied
Shuaishuai Ma, Qing Li, Zhilan Cai, Zhaolian Ye, Yuming Zhou
APPLIED ORGANOMETALLIC CHEMISTRY
(2018)
