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论文类型：期刊论文

发表时间：2009-03-01

发表刊物：TOPICS IN CATALYSIS

收录刊物：SCIE、EI、CPCI-S

卷号：52

期号：1-2

页面范围：185-192

ISSN号：1022-5528

关键字：Alkaline treatment; TS-1; Phenol hydroxylation; Mesoporous zeolite

摘要：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.