Release Time:2019-03-10  Hits:

Indexed by: Journal Article

Date of Publication: 2009-03-01

Journal: TOPICS IN CATALYSIS

Included Journals: CPCI-S、EI、SCIE

Volume: 52

Issue: 1-2

Page Number: 185-192

ISSN: 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.