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Indexed by:期刊论文

Date of Publication:2009-04-15

Journal:CHEMICAL ENGINEERING JOURNAL

Included Journals:SCIE、EI

Volume:147

Issue:2-3

Page Number:316-322

ISSN No.:1385-8947

Key Words:Silicalite-1; TS-1; Zeolite; Film; Membrane reactor

Abstract:Titanium silicalite-1 (TS-1) zeolites and films supported on porous alpha-Al(2)O(3) tubes were prepared using TS-1 and silicalite-1 (Sil-1) seeds by hydrothermal synthesis. The structure and catalytic properties of the TS-1 powders and films were characterized by SEM, XRD, FT-IR, UV-vis and styrene partial oxidation by hydrogen peroxide. The results showed that TS-1 prepared from Sil-1 seeds were as active as TS-1 from nucleated and TS-1 seeded syntheses, in spite of the concerns about nonuniformity and dilution caused by the use of pure silica Sil-1 seeds. The Ti atoms were successfully incorporated as tetra-coordinated titanium in the zeolite framework and the phenylacetaldehyde selectivity correlates well with the infrared band for Ti-O-Si of the TS-1. Reaction over TS-1 film indicates that reactions occurred at the topmost layer of the film due to the slow diffusion in the zeolite pores. (C) 2008 Elsevier B.V. All rights reserved.