点击次数：

论文类型：期刊论文

发表时间：2015-11-16

发表刊物：ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

收录刊物：SCIE、EI、PubMed、Scopus

卷号：54

期号：47

页面范围：13994-13998

ISSN号：1433-7851

关键字：alumina; dehydrogenation; heterogeneous catalysis; nanosheets; propane

摘要：In heterogeneous catalysis, supports play a crucial role in modulating the geometric and electronic structure of the active metal phase for optimizing the catalytic performance. A gamma-Al2O3 nanosheet that contains 27% pentacoordinate Al3+ sites can nicely disperse and stabilize raft-like Pt-Sn clusters as a result of strong interactions between metal and support. Consequently, there are strong electronic interactions between the Pt and Sn atoms, resulting in an increase in the electron density of the Pt sites. When used in the propane dehydrogenation reaction, this catalyst displayed an excellent specific activity for propylene formation with > 99% selectivity, and superior anti-coking and anti-sintering properties. Its exceptional ability to maintain the high activity and stability at ultrahigh space velocities further showed that the sheet construction of the catalyst facilitated the kinetic transfer process.