期刊
SCIENCE
卷 373, 期 6551, 页码 217-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abg7894
关键词
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资金
- RAPID [DE-EE0007888]
- US DOE Office of Basic Energy Sciences, Division of Chemical Sciences [DE-SC0021008]
- University of Michigan College of Engineering
- National Science Foundation Graduate Research Fellowship [DGE 1256260]
- U.S. Department of Energy (DOE) [DE-SC0021008] Funding Source: U.S. Department of Energy (DOE)
Silica-supported platinum-tin nanoparticles can function as a PDH catalyst with excellent stability and selectivity to propylene, without Pt-Sn segregation and tin oxide phase formation over the catalyst support.
Intentional (on-purpose) propylene production through nonoxidative propane dehydrogenation (PDH) holds great promise for meeting the increasing global demand for propylene. For stable performance, traditional alumina-supported platinum-based catalysts require excess tin and feed dilution with hydrogen; however, this reduces per-pass propylene conversion and thus lowers catalyst productivity. We report that silica-supported platinum-tin (Pt1Sn1) nanoparticles (<2 nanometers in diameter) can operate as a PDH catalyst at thermodynamically limited conversion levels, with excellent stability and selectivity to propylene (>99%). Atomic mixing of Pt and Sn in the precursor is preserved upon reduction and during catalytic operation. The benign interaction of these nanoparticles with the silicon dioxide support does not lead to Pt-Sn segregation and formation of a tin oxide phase that can occur over traditional catalyst supports.
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