蒸汽相体系下合成SAPO-34分子筛及其MTO催化性能  

Synthesis of SAPO-34 Molecular Sieve by Vapor-Phase Transport and Its Catalytic Performance in Methanol to Olefin(MTO)Reaction

作　　者：李志宏[1] 李晓峰[1] 狄春雨[1] 何祖光 窦涛[1,2] LI Zhihong;LI Xiaofeng;DI Chunyu;HE Zuguang;DOU Tao(Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan 030024, China;CNPC Key Laboratory of Catalysis, China University of Petroleum, Beijing 102249, China)

机构地区：[1]太原理工大学精细化工研究所,山西太原030024 [2]中国石油大学中国石油天然气集团催化重点实验室,北京102249

出　　处：《石油学报（石油加工）》2017年第6期1192-1201,共10页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家重点基础研究发展规划"973"项目(2004Cb217806);国家自然科学基金项目(20973123);火炬计划项目(2014061002-01)资助

摘　　要：分别采用TEA(三乙胺)、DEA(二乙胺)、TEAOH(四乙基氢氧化铵)、MOR(吗啉)中的1种或2种有机胺作为模板剂,在蒸汽相体系下均可合成纯相的SAPO-34分子筛,通过XRD、SEM、NH_3-TPD、BET、XRF等手段对产物进行表征。结果表明,与水热法合成的样品HTS-SAPO-34进行对比,蒸汽相条件下的产物DGC-SAPO-34结晶度提高,粒径变小,酸强度减弱,将其用于甲醇制烯烃(MTO)催化反应时寿命可延长9.85%~96.4%,双烯(乙烯+丙烯)选择性提高0.81%~4.93%;在蒸汽相、双模板合成SAPO-34分子筛时,TEAOH部分添加既可以有效地调控产物的晶粒大小,又能充分调变酸分布,其MTO催化性能相比单一模板(TEAOH除外)所合成样品有显著的提高,该方法有利于保持较高性能,同时降低合成成本,具有重要的实际应用价值。Under the vaporphase transport condition,SAPO34molecular sieve had been successfully synthesized with one or two of the organic amines such as TEA(triethylamine),DEA(diethylamine),TEAOH(tetraethyl ammonium hydroxide),MOR(morpholine)as the template agent.The synthesized samples were characterized by XRD,SEM,NH3TPD,BET,XRF.Compared with the sample HTSSAPO34,DGCSAPO34possessed higher crystallinity,smaller size,weaker acidity;in addition,it extended the lifetime by9.85%-96.4%,increased selectivity sum of ethylene and propylene by0.81%-4.93%in methanol to olefin(MTO)reaction.Under the vaporphase transport condition and the double template synthesis of SAPO34molecular sieve,TEAOH could effectively control the sample size and the acid distribution.Its MTO catalyst performance significantly improved as compared with all samples of single template(except TEAOH).This method could reduce the cost while maintaining excellent catalytic performance,so it could have an important practical application value.

关 键 词：SAPO-34分子筛 蒸汽相法 甲醇制烯烃(MTO) 

分 类 号：TQ426.61[化学工程]