Selective Catalytic Behavior Induced by Crystal–Phase Transformation in Well–Defined Bimetallic Pt–Sn Nanocrystals

Werghi, Baraa; Wu, Liheng; Ebrahim, Amani M.; Chi, Miaofang; Ni, Haoyang; Cargnello, Matteo; Bare, Simon R.

doi:10.1002/smll.202207956

Selective Catalytic Behavior Induced by Crystal–Phase Transformation in Well–Defined Bimetallic Pt–Sn Nanocrystals

Journal Article · Sun Feb 19 23:00:00 EST 2023 · Small

DOI:https://doi.org/10.1002/smll.202207956· OSTI ID:1998173

^[1]; Wu, Liheng ^[2]; ^[3]; ^[4]; ^[4]; ^[5]; ^[6]

SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL); Stanford Univ., CA (United States). SUNCAT Center for Interface Science and Catalysis; SLAC
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL); Stanford Univ., CA (United States)
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Stanford Univ., CA (United States). SUNCAT Center for Interface Science and Catalysis
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL); Stanford Univ., CA (United States). SUNCAT Center for Interface Science and Catalysis

The Pt-Sn bimetallic system is a much studied and commercially used catalyst for propane dehydrogenation. The traditionally prepared catalyst, however, suffers from inhomogeneity and phase separation of the active Pt–Sn phase. Colloidal chemistry offers a route for the synthesis of Pt–Sn bimetallic nanoparticles (NPs) in a systematic, well-defined, tailored fashion over conventional methods. Here, the successful synthesis of well-defined ≈2 nm Pt, PtSn, and Pt₃Sn nanocrystals with distinct crystallographic phases is reported; hexagonal close packing (hcp) PtSn and fcc Pt₃Sn show different activity and stability depending on the hydrogen-rich or poor environment in the feed. Moreover, face centred cubic (fcc) Pt₃Sn/Al₂O₃, which exhibited the highest stability compared to hcp PtSn, shows a unique phase transformation from an fcc phase to an L1₂-ordered superlattice. Contrary to PtSn, H₂ cofeeding has no effect on the Pt₃Sn deactivation rate. Finally, the results reveal structural dependency of the probe reaction, propane dehydrogenation, and provide a fundamental understanding of the structure–performance relationship on emerging bimetallic systems.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); National Science Foundation (NSF)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1998173

Alternate ID(s):: OSTI ID: 2004647
OSTI ID: 1957869
OSTI ID: 1998175

Journal Information:: Small, Journal Name: Small Journal Issue: 20 Vol. 19; ISSN 1613-6810

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
bimetallic alloys
dehydrogenation
dynamics
nanocrystals
operando
structure and size control

Selective Catalytic Behavior Induced by Crystal–Phase Transformation in Well–Defined Bimetallic Pt–Sn Nanocrystals

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