点击次数：

论文类型：期刊论文

发表时间：2009-10-30

发表刊物：CATALYSIS TODAY

收录刊物：SCIE、EI、Scopus

卷号：148

期号：1-2

页面范围：174-178

ISSN号：0920-5861

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

摘要：The present study reports the effects of crystal size of TS-1 (micrometer sized umTS1 and nanometer sized nmTS1) and the post-treatment (TPAOH and NaOH treatment) on the porous structure and the catalytic performances of TS-1 in phenol hydroxylation. TPAOH post-treatment generates hollow crystal and increases the surface area of umTS1 without changing its pore structure. In contrast, NaOH treatment selectively dissolves framework silica to form mesopore and modify microporous structure through which hierarchical material is constructed with agglomerated crystals. The umTS1 sample gives a much lower conversion and lower selectivity of dihydroxyl benzenes (DHB) than the nmTS1 sample. Its activity can be greatly improved by TPAOH post-treatment exhibiting a comparable catalytic activity and DHB selectivity with the nmTS1 sample. Furthermore, successive post-treatment by TPAOH following with NaOH can generate micropores larger than the pore size of TS-1. The higher titanium content and faster diffusivity associated with the successive post-treatment significantly improve the catalytic performance of TS-1. (C) 2009 Elsevier B.V. All rights reserved.