钛改性 Cu2O 上稳定的 Cu(+)表面位上的丙烯直接环氧化。

Direct epoxidation of propylene over stabilized Cu(+) surface sites on titanium-modified Cu2O.

机构信息

Chemistry Department, Brookhaven National Laboratory, 2 Center St., Upton, NY 11973 (USA).

Department of Chemical and Biomolecular Engineering, University of Delaware, 150 Academy St., Newark, DE 19716 (USA).

出版信息

Angew Chem Int Ed Engl. 2015 Oct 5;54(41):11946-51. doi: 10.1002/anie.201504538. Epub 2015 Jul 17.

DOI:10.1002/anie.201504538

PMID:26215635

Abstract

Direct propylene epoxidation by O2 is a challenging reaction because of the strong tendency for complete combustion. Results from the current study demonstrate that by generating highly dispersed and stabilized Cu(+) active sites in a TiCuOx mixed oxide the epoxidation selectivity can be tuned. The TiCuOx surface anchors the key surface intermediate, an oxametallacycle, leading to higher selectivity for epoxidation of propylene.

摘要

丙烯直接环氧化反应由 O2 引发，但由于其完全燃烧的强烈趋势，该反应极具挑战性。当前研究结果表明，通过在 TiCuOx 混合氧化物中生成高度分散和稳定的 Cu(+)活性位，可以调节环氧化选择性。TiCuOx 表面固定关键的表面中间物，即氧杂金属环，从而提高丙烯环氧化的选择性。