Structural dynamics of PtSn/SiO2 for propane dehydrogenation
Date
2024-07-24
Journal Title
Journal ISSN
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Publisher
Catalysis Science & Technology
Abstract
PtSn bimetallic catalysts are among the best-performing propane dehydrogenation (PDH) catalysts. However, understanding these catalysts remains limited due to the intricate nature of bimetallic systems and their dynamic structural evolution under reaction conditions. To address this challenge, we employ various in situ/operando techniques, including UV-vis, CO diffuse reflective infrared Fourier transform spectroscopy (CO-DRIFTS), near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS), and operando X-ray absorption spectroscopy (XAS), to elucidate the structural dynamics of PtSn/SiO2 catalysts under reduction and working conditions. Our investigation reveals that the interactions between Pt, Sn, and SiO2 support are strongly influenced by the synthesis procedures and the initial catalyst structure. Exposure to H2 causes a reversible Sn–OH formation observed by modulation excitation spectroscopy (MES). A sequentially impregnated catalyst with a nominal Pt : Sn ratio of 1 : 3 and a co-impregnated catalyst with a ratio of 1 : 2 exhibit optimal performance for PDH. Despite distinct synthesis procedures and bulk structures, these two catalysts exhibit comparable surface properties and PDH performance, attributed to the dynamic migration of Sn species and formation of a Pt-rich metal surface under reductive atmospheres.
Description
This article was originally published in Catalysis Science & Technology. The version of record is available at: https://doi.org/10.1039/D4CY00725E.
This journal is © The Royal Society of Chemistry 2024.
This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence (http://creativecommons.org/licenses/by-nc/3.0/).
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Citation
Yu, Kewei, Matthew Scarpelli, Sagar Sourav, Alfred Worrad, J. Anibal Boscoboinik, Lu Ma, Steven N. Ehrlich, Nebojsa Marinkovic, Weiqing Zheng, and Dionisios G. Vlachos. “Structural Dynamics of PtSn/SiO2 for Propane Dehydrogenation.” Catalysis Science & Technology 14, no. 17 (2024): 4948–57. https://doi.org/10.1039/D4CY00725E.