期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 23, 页码 25903-25909出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c05043
关键词
Pt-Sn bimetallic nanoparticles; intermetallic; propane dehydrogenation; geometric structure; electronic structure
资金
- National Science Foundation [EEC1647722]
- Department of Energy
- MRCAT member institutions
- Chinese Scholarship Council (CSC)
A series of 2-3 nm Pt-Sn bimetallic nanoparticles with different Pt-Sn coordination numbers were synthesized by a stepwise approach including electrostatic adsorption and temperature-programmed reduction of metal precursors on the SiO2 support. In situ synchrotron X-ray diffraction (XRD) and X-ray absorption fine structure (XAFS) demonstrated a highly ordered hexagonal Pt1Sn1 intermetallic shell on Pt nanoparticles. The turnover rates (TORs), propylene selectivity, and stability of these bimetallic catalysts significantly surpass those of the monometallic Pt catalyst for propane dehydrogenation. At the same time, TORs increase with increasing the Pt-Sn coordination number, whereas propylene selectivity is not significantly influenced by the Pt-Sn coordination number. Combined with experiments and theoretical calculations, the high propylene selectivity of Pt-Sn bimetallic nanoparticles is attributed to the geometric effects of Sn that reduce the Pt ensembles, and the high TORs are due to the electronic effects that weaken Pt-hydrocarbon chemisorption energies.
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