文献类型：期刊文献

中文题名：硅源量和晶化时间对SAPO-34分子筛结构和性能的影响

英文题名：Effects of Silicon Source Content and Crystallization Time on the Structure and Catalytic Performance of SAPO-34Molecular Sieve

作者：刘红星[1,2];谢在库[3];张成芳[1];陈庆龄[3];杨一青[3]

机构：[1]华东理工大学化工工艺研究所;[2]上海石油化工研究院,上海201208;[3]上海石油化工研究院

年份：2003

卷号：19

期号：3

起止页码：240

中文期刊名：无机化学学报

外文期刊名：Chinese Journal of Inorganic Chemistry

收录：CSTPCD;;Scopus;北大核心:【北大核心2000】；CSCD:【CSCD2011_2012】；

基金：中石化重点科技攻关项目(No.401085)。

语种：中文

中文关键词：SAPO-34;硅源量;晶化时间;结构;催化性能

外文关键词：SAPO-34; silicon source content; crystallization time; structure catalytic performance

摘要：以吗啡啉为模板剂合成了SAPO-34分子筛,研究了晶化液SiO2/Al2O3比(硅源量)的影响。当SiO2/Al2O3≥0.6时,能合成出纯净的SAPO-34分子筛;SiO2/Al2O3=1.0时,分子筛骨架中出现“硅岛”结构,此时合成的分子筛样品具有最高的(乙烯+丙烯)选择性。继续增大硅铝比对(乙烯+丙烯)选择性是不利的。对SAPO-34分子筛晶化历程的研究结果表明,SAPO-34的晶化存在一个最佳晶化时间,在36h左右;此后继续晶化,将会使更多Si原子进入分子筛骨架,形成更多或者更大的“硅岛”,使(乙烯+丙烯)选择性下降。
SAPO-34 molecular sieve is synthesized using morpholine as the template. The effect of silicon content on structure and catalytic performance of SAPO-34 is investigated. When SiO2/Al2O3 greater than or equal to 0.6 in the initial gel, pure SAPO-34 molecular sieve is obtained; When SiO2/Al2O3 = 1.0, 'silicon island' forms and the sample synthesized has the highest (C-2(=) + C-3(=)) selectivity. However, when SiO2/Al2O3 value is increased to a value greater than 1.2, (C-2(=) + C-3(=)) selectivity decreases. The crystallization process of SAPO-34 is also investigated, and the results show that there is an optimal crystallization time, ca 36h; if the crystallization process continues after 36h, more or bigger 'silicon island' would form and result in low (C-2(=) + C-3(=)) selectivity.