期刊
JOURNAL OF CATALYSIS
卷 267, 期 2, 页码 202-206出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2009.08.002
关键词
Propylene epoxidation; Au catalyst; TS-1; Germanium; Modification
资金
- National Science Foundation of China [20703039]
- US National Science Foundation [CBET 0651238]
The epoxidation of propylene with H-2-O-2 mixtures was studied over a gold catalyst supported on a Gemodified TS-1 catalyst at 170 degrees C. Shifts of X-ray diffraction lines to lower angle showed that the Ge was incorporated into the structure of the TS-1. The presence of Ge more than doubled the conversion from 1.6% to 4% while increasing selectivity from 87% to 91%. Density functional theory calculations indicated that the origin of the enhanced activity was a ligand effect of Ge on Ti, which lowered the activation energy for the critical epoxidation step. (C) 2009 Elsevier Inc. All rights reserved.
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