不同硅铝比SAPO-18分子筛的合成及其MTO性能  

Synthesis and MTO performance of SAPO-18 molecular sieves with different Si/Al ratio

作　　者：张岩 李渊[1] 赵飞[1] 

机构地区：[1]天津工业大学环境与化学工程学院

出　　处：《石油与天然气化工》2017年第5期41-46,共6页Chemical engineering of oil & gas

基　　金：天津市科技特派员项目"用于MTO过程的硅铝基分子筛的制备研究"(14JCTPJC00559)

摘　　要：以N,N-二异丙基乙胺为模板剂,通过水热法合成了SAPO-18分子筛。借助XRD、SEM、BET、FTIR对分子筛进行表征后发现,当硅铝比(物质的量比)介于0.2~0.6时能成功合成出SAPO-18分子筛;对分子筛进行MTO评价发现,当硅铝比较低时,分子筛的寿命较长,但是选择性偏低;随着硅铝比的提高,分子筛的寿命降低,其选择性略微提高。综合考虑硅铝比为0.2的SAPO-18分子筛最适宜,其双烯选择性为76%,寿命为140min。此外,还探究了反应温度和空速对于SAPO-18分子筛催化MTO过程的影响,发现适当增大温度和空速都能提高SAPO-18分子筛的双烯选择性。SAPO-18 was hydrothermally synthesized using a template of N, Ndiisopropylethylamine(DIEA).The molecular sieve was characterized by XRD,SEM,BET and FTIR.The results showed that the SAPO-18 molecular sieves could be successfully synthesized when the silica-alumina ratio(molar ratio)was between 0.2 and 0.6.The molecular sieve was evaluated in MTO process.It was found that when the silica-alumina ratio was low,the life of the molecular sieve was long,but the selectivity was low.With the Si/Al ratio increased,the life of zeolite decreased and the selectivity increased slightly.To be considered comprehensively,the SiO_2/Al_2O_3 ratio of 0.2 was the most suitable,its dilute selectivity was 76% and the lifetime was 140 min.In addition,the effects of reaction temperature and space velocity on SAPO-18 zeolites catalyzed MTO process were also investigated.It was found that the double dilute selectivity of SAPO-18 zeolites could be increased with the increase of temperature and space velocity.

关 键 词：SAPO-18 合成 MTO 催化 性能 

分 类 号：O643.36[理学—物理化学] TQ221.21[理学—化学]