酸处理对UZM-5分子筛结构及表面酸性的影响  

Influence of acid treatment on the structure and surface acidity of UZM-5 zeolite

作　　者：贾银娟[1] 钱斌[1] 高焕新[1] 

机构地区：[1]中国石化上海石油化工研究院,上海201208

出　　处：《工业催化》2011年第7期20-23,共4页Industrial Catalysis

基　　金：国家重点基础研究发展计划(973计划)(2003CB615804)

摘　　要：用柠檬酸对焙烧前后的UZM-5分子筛进行处理,并与盐酸处理的UZM-5分子筛样品进行比较。通过XRD、ICP、NH_3-TPD、Py-IR及^(27)Al NMR固体核磁表征方法,研究酸处理对UZM-5分子筛的结构及表面酸性的影响。结果表明,酸处理没有破坏UZM-5分子筛的结构,用柠檬酸对焙烧后的样品进行处理后,样品的B酸增加,L酸减少,表面总酸量基本不变;盐酸处理后,样品的B酸、L酸及表面总酸量均明显减少。As-synthesised and calcined UZM-5 zeolite were treated with citric acid and hydrochloric acid under different conditions. The samples were characterized by XRD, ICP, NH3-TPD, Py-IR and 27A1 NMR. The results showed that the structure of UZM-5 were kept after acid treatment. Brtinsted acid sites of the samples increased and Lewis acid sites decreased after citric acid treatment and the total surface acid sites remained constant. Brfinsted acid sites, Lewis acid sites and the total surface acid sites of the samples decreased after treatment with hydrochloric acid.

关 键 词：催化化学 UZM-5分子筛 柠檬酸 盐酸 表面酸性 

分 类 号：O643.36[理学—物理化学] TQ426.6[理学—化学]