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钛硅分子筛中铝杂质对其性能的影响

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Indexed by:期刊论文

Date of Publication:2001-09-01

Journal:催化学报

Included Journals:Scopus、SCIE、PKU、CSCD

Volume:22

Issue:5

Page Number:465-468

ISSN No.:0253-9837

Key Words:钛硅分子筛;铝杂质;丙烯;环氧化;环氧丙烷,丙二醇单甲醚;丙二醇

Abstract:以四丙基溴化铵为模板剂,以硅溶胶为硅源,采用水热合成法制备了不同铝杂质含量的钛硅分子筛,并系统考察了铝杂质对钛硅分子筛性能的影响. 结果表明,原料中的铝杂质可促进钛硅分子筛晶化,但同时也引入了酸性中心;在丙烯环氧化反应中,铝杂质形成的酸性中心会催化环氧丙烷与溶剂的副反应;加入少量碱性添加物可抑制铝杂质的酸催化作用,提高环氧丙烷的选择性,但过量碱性添加物会使钛硅分子筛失活.

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