Release Time:2019-03-10  Hits:

Indexed by: Journal Article

Date of Publication: 2005-01-01

Journal: CHINESE CHEMICAL LETTERS

Included Journals: ISTIC、SCIE、Scopus

Volume: 16

Issue: 1

Page Number: 103-106

ISSN: 1001-8417

Key Words: hydrothermal; TS-1/SiO2; propylene epoxidation; EPR; radical

Abstract: The propylene epoxidation over TS-1/SiO2 catalyst hydrothermally treated was investigated. It was found by EPR characterization that two types of Ti (IV)-superoxide radicals, A (g(z=)2.0271; g(y)=2.0074; g(x)=2.0010) and B (g(z)=2.0247; g(y)=2.0074; g(x)= 2,0010), were observed for TS-1/SiO2. The superoxo species A converted to B after TS-1/SiO2 catalyst was hydrothermally treated. The results show that over TS-I/SiO2 catalyst hydrothermally treated at 170degreesC, about 95% conversion of H2O2 with above 94% PO selectivity is obtained during continuous running for 300 h under the conditions of reaction temperature 45degreesC, 0.5 h(-1)WHSV of propylene.