期刊
SCIENCE
卷 328, 期 5975, 页码 224-228出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1185200
关键词
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资金
- U.S. Department of Energy, Office of Basic Energy (Chemical Sciences, Materials Sciences, and Scientific User Facilities) [DE-AC-02-06CH11357]
- American Chemical Society
- U.S. Air Force Office of Scientific Research
Production of the industrial chemical propylene oxide is energy-intensive and environmentally unfriendly. Catalysts based on bulk silver surfaces with direct propylene epoxidation by molecular oxygen have not resolved these problems because of substantial formation of carbon dioxide. We found that unpromoted, size-selected Ag(3) clusters and similar to 3.5-nanometer Ag nanoparticles on alumina supports can catalyze this reaction with only a negligible amount of carbon dioxide formation and with high activity at low temperatures. Density functional calculations show that, relative to extended silver surfaces, oxidized silver trimers are more active and selective for epoxidation because of the open-shell nature of their electronic structure. The results suggest that new architectures based on ultrasmall silver particles may provide highly efficient catalysts for propylene epoxidation.
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