Enhanced Catalytic Performance of Cr/MOR for Ethane Dehydrogenation Through Dealumination
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Enhanced Catalytic Performance of Cr/MOR for Ethane Dehydrogenation Through Dealumination Hongyao Guo1 · Changxi Miao2 · Weiming Hua1 · Yinghong Yue1 · Zi Gao1 Received: 1 July 2020 / Accepted: 5 October 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Dehydrogenation of ethane to ethylene assisted by CO2 was investigated over CrOx catalysts supported on MOR zeolites. The catalysts were characterized by XRD, N 2 adsorption, SEM, 27Al and 29Si MAS NMR, XPS, DRIFTS, H 2-TPR and laser Raman spectroscopy. The catalysts exhibit enhanced activity and stability after MOR dealumination, with an optimal ethane conversion of ~ 38% and ethylene yield of ~ 33%. Characterization results indicate that the improved catalytic performance derives from the increased silanol nests of MOR support created by acidic dealumination, which are in favor of dispersion and stabilization of CrOx species, resulting in more reducible Cr(VI) considered as the active site for dehydrogenation. Graphic Abstract
Keyword Ethane dehydrogenation · Cr oxide · Mordenite · Dealumination · CO2 Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10562-020-03421-7) contains supplementary material, which is available to authorized users. * Yinghong Yue [email protected] Hongyao Guo [email protected] Changxi Miao [email protected] Weiming Hua [email protected] Zi Gao [email protected] 1
Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200438, People’s Republic of China
Shanghai Research Institute of Petrochemical Technology, Shanghai 201208, People’s Republic of China
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1 Introduction Ethylene is a vital building block in petrochemical industry, which can produce numerous high-valued chemicals such as polyethylene, ethanol and synthetic rubber and so on [1, 2]. The traditional manufacture ways of ethylene, including the pyrolysis of gaseous alkanes and fluid catalytic cracking (FCC), can’t meet with the increasing demand of the market ascribed to the depletion of petroleum. Compared to ethane direct dehydrogenation and oxidative dehydrogenation with O2, dehydrogenation assisted by C O2 (CO2-DHE) has been regarded as one of the most promising strategies [3–6]. The beneficial employment of CO2 as a soft oxidant comprises the reaction equilibrium promotion via reverse water–gas shift reaction (RWGS) and the catalyst stability improvement by removing coke via Boudouard reaction [7, 8]. Moreover,
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the utilization of C O2 also opens up a new way to reduce these greenhouse emissions. Cr-based catalysts showed high activity for C O2-DHE, which were usually prepared by dispersing Cr species on supports with high surface areas, including inorganic oxides and porous materials [9–12]. Zeolite has attracted more attention for Cr-based supported catalysts recently, due to its excellent hydrothermal stability, unique surface character and porous s
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