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Indexed by:期刊论文

Date of Publication:2018-12-05

Journal:INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

Included Journals:SCIE、Scopus

Volume:57

Issue:48

Page Number:16284-16294

ISSN No.:0888-5885

Key Words:Catalysts; Esters; Oxidants; Reusability; Silica; Unsaturated fatty acids; Vegetables, Catalytic performance; Cumene hydroperoxide; Fatty acid methyl ester; Fatty acid methyl esters (FAMEs); High surface area; Methyl oleate; Silica catalyst; Solvent free conditions, Titanium compounds

Abstract:With different oxidants (aqueous H(2)O(2 )or cumene hydroperoxide), Ti-containing silica catalysts (hierarchical TS-1, Ti-MCM-41, and Ti-HMS) were applied as catalysts for the epoxidation of methyl oleate (MO) and vegetable-derived unsaturated fatty acid methyl esters (FAMEs). We found that the catalytic performances of titanium silicalites were highly dependent on oxidant types. For the epoxidation of MO over hierarchical TS-1 (HTS-1), aqueous H2O2 is a better oxidant compared with cumene hydroperoxide (CHP). Benefiting from good molecular accessibility and high activity of Ti sites, combined with high hydrophobicity, ultra-high-yield epoxides were obtained over HTS-1. In contrast, CHP was more favorable for Ti-HMS catalyst, which was beneficial to selective conversion of MO into epoxide under solvent-free conditions. The superior catalytic performance was ascribed to the high surface area and pore volume of Ti-HMS. Furthermore, the corresponding structure-catalytic performance relationships and reusability of various catalysts were discussed in consideration of the effect of oxidants.