Catalytic aerobic oxidation of cyclohexane and ethyl benzene over chromium-containing mesoporous organosilicas

TitleCatalytic aerobic oxidation of cyclohexane and ethyl benzene over chromium-containing mesoporous organosilicas
Publication TypeJournal Article
Year of Publication2009
AuthorsSingh, AP, Torita, N, Shylesh, S, Iwasa, N, Arai, M
JournalCatalysis Letters
Volume132
Issue3-4
Pagination492-499
Date PublishedOCT
ISSN1011-372X
KeywordsCr-MCM-41, Cyclohexane, Ethyl benzene, Organosilicas, Oxidation
Abstract

Chromium-containing ethane-bridged hybrid periodic mesoporous organosilicas (Cr-PMO) were synthesized using 1,2-bis(triethoxysilyl) ethane (BTEE) and tetraethyl orthosilicate (TEOS) as silica sources and alkyltrimethyl ammonium salts as surfactants by two different synthesis routes. PXRD and N(2) adsorption-desorption analysis shows that the original structure of the materials is maintained after chromium substitution while spectroscopic study proves the incorporation of chromium in the frame wall positions and show the existence of Cr(2)O(3) species in the mixed silica source (BTEE-TEOS) synthesized chromium samples. The catalytic activity of the newly developed chromium samples was evaluated in the liquid phase oxidation of cyclohexane and ethylbenzene using air as an oxidant. Further, the Cr-PMO samples exhibited better cyclohexane conversion and cyclohexanone selectivity than the conventional Cr-MCM-41 and other metal-containing MCM-41 samples. The exceptional activity of the new chromium-containing molecular sieves is attributed to the hydrophobicity of the materials and to the complementary structural features that facilitates the accessibility of substrate to the active framework chromium sites.

DOI10.1007/s10562-009-0121-x
Type of Journal (Indian or Foreign)

Foreign

Impact Factor (IF)

1.907

Divison category: 
Catalysis and Inorganic Chemistry