Elucidating the promoting advantages and fundamentals for their creation in Sn-modified commercial CrOx/Al2O3 catalyst for propane dehydrogenation

Elucidating the promoting advantages and fundamentals for their creation in Sn-modified commercial CrOx/Al2O3 catalyst for propane dehydrogenation

[Display omitted] •The effect of Sn modification on CrOx/Al2O3 for PDH was studied.•The appropriate interaction between Cr and Sn contributed to migration of Cr.•The shared hydroxyl groups from Sn addition decreased strong acidity of Al2O3.•The regulated surface acidic properties caused faster propy...

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Bibliographic Details
Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 483; p. 149366
Main Authors: Zhang, Lei, Chen, Kezhen, Chen, Huarong, Han, Xiangyun, Liu, Chenqian, Qiao, Lingdan, Wu, Wenwei, Yang, Bairen
Format: Journal Article
Language:English
Published: Elsevier B.V 01-03-2024
Subjects:
Commercial CrOx/Al2O3
Cr-Sn interaction
Propane dehydrogenation
Sn promotion
Commercial CrOx/Al2O3
Propane dehydrogenation
Cr-Sn interaction
Sn promotion
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Summary:[Display omitted] •The effect of Sn modification on CrOx/Al2O3 for PDH was studied.•The appropriate interaction between Cr and Sn contributed to migration of Cr.•The shared hydroxyl groups from Sn addition decreased strong acidity of Al2O3.•The regulated surface acidic properties caused faster propylene desorption. Commercial propane dehydrogenation (PDH) catalyst of CrOx/Al2O3 are generally faced with the challenge of rapid deactivation because of severe coke accumulation, which requires frequent regeneration and causes massive emission of undesired CO2. In this work, the effect of Sn promotion on the substantial improvement of catalytic durability over the CrOx/Al2O3 during the PDH was investigated. The superior role of Sn modification is mainly based on the following features and proposed by the designed ex-situ and in-situ experiments. Firstly, electronic effects from Sn addition weaken interaction between Cr and the Al2O3 support, which is beneficial for the advantageous migration of active Cr sites during the PDH reaction. Moreover, effective regulation of catalyst surface species and acidic properties avoids the subsequent side reactions to generate coke precursors. This work provides novel inspiration for the development of the commercial CrOx/Al2O3 catalyst for PDH process.
ISSN:1385-8947
DOI:10.1016/j.cej.2024.149366