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Indexed by:期刊论文

Date of Publication:2009-03-01

Journal:TOPICS IN CATALYSIS

Included Journals:SCIE、EI、CPCI-S

Volume:52

Issue:1-2

Page Number:185-192

ISSN No.:1022-5528

Key Words:Alkaline treatment; TS-1; Phenol hydroxylation; Mesoporous zeolite

Abstract:Alkaline treatment on TS-1 can selective remove silica from the framework while MFI zeolitic framework remains intact, which creates new large micropores or even mesopores and increases Si/Ti ratio in the alkaline treated TS-1. Among various alkaline hydroxide, CsOH treatment leads to partial destruction of MFI structure. All the desilicated TS-1 samples show enhanced phenol conversion and dihydroxylbenzene (DHB) yield in acetone solvent by two folds, which can be attributed to the higher Ti/Si ratio and improved diffusivity. Pore structure modified with alkaline treatment affects significantly reaction pathway and product selectivity. The initial product over the parent TS-1 and NaOH treated TS-1 is mainly 4-hydroxycyclohexa-2,5-dienone and catechol enriched DHB, respectively.