快速合成Cu-SAPO-34分子筛及其甲醇制烯烃催化性能

Rapid synthesis of Cu-SAPO-34 zeolite and MTO catalytic performance

通过引入含铜分子筛晶种作为铜源、10 h快速合成出Cu-SAPO-34分子筛,并与传统的水热合成法和铜胺络合物引入铜源的方式进行对比,同时利用XRD、SEM、IR、TPD和微反等手段表征样品的结构和甲醇制烯烃(MTO)催化性能。结果表明:与常规合成方法相比,快速合成法可在10 h制备出结晶度在86.24%,固体收率达到94.65%的Cu-SAPO-34分子筛,其乙烯+丙烯选择之和达到81.26%;与添加铜胺络合物相比,加入含铜分子筛晶种的方式引入铜元素,更合适于快速合成法,避免了铜无法与分子筛骨架结合的问题;通过调整含铜分子筛晶种的性质及加入量,可以快速合成晶粒直径在470 nm的纳米Cu-SAPO-34分子筛,固体收率达到96.72%,乙烯+丙烯选择之和达到86.24%。

Cu-SAPO-34 molecular sieves were rapidly synthesized with introduced copper zeolite seed as copper source for 10 h,which were compared with the traditional hydrothermal synthesis method and copper amine complex introduced copper source.Meanwhile,the structure and methanel to olefin(MTO)catalytic performance of the sample were characterized by XRD,SEM,IR,TPD and micro reaction.The results show that the Cu-SAPO-34 molecular sieve with a crystallinity of 86.24%and solid yield of 94.65%could be prepared by rapid synthesis method in 10 h,and the sum of ethylene and propylene selectivity reaches 81.26%.Compared with the addition of copper amine complex,the introduction of copper by adding copper seed is more suitable for rapid synthesis and avoids the problem that copper cannot combine with molecular sieve framework.Nanosized Cu-SAPO-34 molecular sieves with grain diameter of 470 nm could be rapidly synthesized by adjusting the properties and adding amount of Cu-SAPO-34 seed,in which the solid yield is 96.72%,and the ethylene and propylene selectivity is 86.24%.