Structural dynamics of PtSn/SiO 2 for propane dehydrogenation

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 em...

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Published inCatalysis science & technology Vol. 14; no. 17; pp. 4948 - 4957
Main Authors Yu, Kewei, Scarpelli, Matthew, Sourav, Sagar, Worrad, Alfred, Boscoboinik, J. Anibal, Ma, Lu, Ehrlich, Steven N., Marinkovic, Nebojsa, Zheng, Weiqing, Vlachos, Dionisios G.
Format Journal Article
LanguageEnglish
Published United Kingdom Royal Society of Chemistry (RSC) 27.08.2024
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MATERIALS SCIENCE
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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/SiO 2 catalysts under reduction and working conditions. Our investigation reveals that the interactions between Pt, Sn, and SiO 2 support are strongly influenced by the synthesis procedures and the initial catalyst structure. Exposure to H 2 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.
AbstractList Operando characterization reveals the structural dynamics of PtSn/SiO 2 catalysts, hinting at a Pt-rich surface configuration for optimal propane dehydrogenation performance.
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/SiO 2 catalysts under reduction and working conditions. Our investigation reveals that the interactions between Pt, Sn, and SiO 2 support are strongly influenced by the synthesis procedures and the initial catalyst structure. Exposure to H 2 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.
Author Yu, Kewei
Ehrlich, Steven N.
Ma, Lu
Boscoboinik, J. Anibal
Marinkovic, Nebojsa
Vlachos, Dionisios G.
Sourav, Sagar
Scarpelli, Matthew
Worrad, Alfred
Zheng, Weiqing
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  organization: Department of Chemical and Biomolecular Engineering, University of Delaware, 150 Academy St., Newark, DE, USA, Delaware Energy Institute, University of Delaware, 221 Academy St., Newark, DE, USA
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Snippet PtSn bimetallic catalysts are among the best-performing propane dehydrogenation (PDH) catalysts. However, understanding these catalysts remains limited due to...
Operando characterization reveals the structural dynamics of PtSn/SiO 2 catalysts, hinting at a Pt-rich surface configuration for optimal propane...
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SubjectTerms MATERIALS SCIENCE
Title Structural dynamics of PtSn/SiO 2 for propane dehydrogenation
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