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Werghi B, Wu L, Ebrahim AM, Chi M, Ni H, Cargnello M, Bare SR. Selective Catalytic Behavior Induced by Crystal-Phase Transformation in Well-Defined Bimetallic Pt-Sn Nanocrystals. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2207956. [PMID: 36807838 DOI: 10.1002/smll.202207956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 02/03/2023] [Indexed: 05/18/2023]
Abstract
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 Pt3 Sn nanocrystals with distinct crystallographic phases is reported; hexagonal close packing (hcp) PtSn and fcc Pt3 Sn show different activity and stability depending on the hydrogen-rich or poor environment in the feed. Moreover, face centred cubic (fcc) Pt3 Sn/Al2 O3 , 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 Pt3 Sn deactivation rate. 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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Affiliation(s)
- Baraa Werghi
- Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
- Department of Chemical Engineering, Stanford University, Stanford, CA, 94305, USA
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
| | - Liheng Wu
- Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
- Department of Chemical Engineering, Stanford University, Stanford, CA, 94305, USA
| | - Amani M Ebrahim
- Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - Miaofang Chi
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, 5200, 1 Bethel Valley Rd, Oak Ridge, TN, 37830, USA
| | - Haoyang Ni
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, 5200, 1 Bethel Valley Rd, Oak Ridge, TN, 37830, USA
| | - Matteo Cargnello
- Department of Chemical Engineering, Stanford University, Stanford, CA, 94305, USA
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
| | - Simon R Bare
- Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
- SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, Menlo Park, CA, 94025, USA
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Ribeiro JYC, dos Anjos AV, Neto ESV, Aristides SS, Salazar-Banda GR, Eguiluz KIB. Influence of different carbon and SnO2 ratios on the activity of PtIr/C (SnO2)1 catalysts toward methanol oxidation. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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