制备条件对MCM-22分子筛催化异丁烯气相齐聚性能的影响  

Effects of Preparation Conditions on Catalytic Performance of MCM-22 Molecular Sieve for Gas Phase Isobutylene Oligmerization

作　　者：董平平[1] 王晓军 侯凯湖[1] 

机构地区：[1]河北工业大学绿色化工研究所,天津300130 [2]长春渤恩国际矿业化工有限公司,吉林长春130052

出　　处：《化学反应工程与工艺》2009年第2期170-174,共5页Chemical Reaction Engineering and Technology

摘　　要：以六亚甲基亚胺为模板剂,硅溶胶为硅源,偏铝酸钠为铝源,采用动态水热法合成了MCM-22分子筛,并考察了MCM-22分子筛的Si与Al之比和制备条件对其催化异丁烯气相齐聚反应性能的影响。结果表明:Si与Al之比对其催化性能影响较小;MCM-22分子筛适宜的制备条件为晶化温度175℃、晶化时间72 h、焙烧温度500℃和离子交换浓度2 mol/L。异丁烯气相齐聚反应的实验结果表明,MCM-22分子筛具有较好的异丁烯齐聚活性,在反应温度225℃和体积空速240 h^(-1)条件下,异丁烯转化率大于50%, C8烯烃选择性大于95%。MCM-22 molecular sieves were synthesized by dynamic hydrothermal method using hexamethyleneimineas organic template, silicon sol and sodium aluminate as silicon source and aluminum source, respectively, and effects of molar ratio of Si to Al and preparation conditions on catalytic performance of MCM-22 molecular sieves for gas phase isobutylene oligmerization were investigated. The results showed that the molar ratio of Si to A1 had little effect on activity of MCM-22 molecular sieve, and appropriate preparation conditions were crystallization temperature 175℃, crystallization time 72 h, calcination temperature 500℃ and ion exchange concentration 2 mol/L. Isobutylene oligmerization indicated that the MCM-22 molecular sieve exhibited high catalytic activity, and isobutylene conversion and C8 olefin temperature 225℃ and selectivity were over 50% and 95 %, respectively, under the reaction conditions of volume space velocity 240 h^-1.

关 键 词：MCM-22分子筛 异丁烯 气相 齐聚 

分 类 号：TQ426.6[化学工程] TQ316.336