MWW分子筛上异丁烯齐聚反应探索  

Oligomerization of isobutene over MWW zeolite based catalysts

作　　者：霍文涛 刘稳 于强 安杰[2] 朱向学[2] 秦玉才 李秀杰[2] HUO Wentao;LIU Wen;YU Qiang;AN Jie;ZHU Xiangxue;QIN Yucai;LI Xiujie(School of Petrochemical Engineering,Liaoning Petrochemical University,Fushun 113001,Liaoning,China;Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,Liaoning,China)

机构地区：[1]辽宁石油化工大学石油化工学院,辽宁抚顺113001 [2]中国科学院大连化学物理研究所,辽宁大连116023

出　　处：《化工进展》2023年第10期5205-5212,共8页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(U20A20120,22172162)。

摘　　要：详细对比研究了不同拓扑结构的分子筛催化剂(EUO、MOR、Beta、MWW)在异丁烯齐聚反应中的催化性能,结果发现具有十/十二元环和超笼孔道结构的MWW分子筛表现出最佳的催化稳定性。反应条件优化实验说明,在反应温度为160℃、反应压力为0.50MPa、异丁烯质量空速为20h^(-1)时,MWW分子筛催化剂具有最优的催化性能,异丁烯转化率可达80%,二异丁烯选择性可达55%。碱处理条件优化实验说明,通过对MWW分子筛进行温和碱处理,可以疏通其孔道结构,清除孔道内的无定形铝物种并构筑介孔,利于产物分子的扩散传输,在一定程度上可以提升二聚产物的选择性,从而提高其催化性能;当对MWW分子筛进行深度碱处理时,容易造成骨架脱铝,破坏其骨架结构,导致其反应稳定性变差。The catalytic performance of zeolite catalysts with EUO,MOR,Beta and MWW topologies in isobutene oligomerization was studied and compared in detail.The MWW zeolites with 10/12-membered ring and supercage structure showed good catalytic stability in the reaction.Under the optimal reaction conditions of 160℃,0.50MPa,20h^(-1),isobutene conversion could reach 80%,and the selectivity for diisobutene was up to 55%.After suitable alkaline treatment,the amorphous aluminosilicate species blocked in the channels were cleaned and some mesopores could be created which was beneficial for the diffusion of the reactant molecules,and the selectivity of diisobutene could be further improved.However,excessive alkaline leaching would lead to the destruction of the MWW zeolite framework and the decrease of acid density which was not good for the reaction stability.

关 键 词：分子筛 聚合 二异丁烯 碱处理 

分 类 号：TE624[石油与天然气工程—油气加工工程] TQ426[化学工程]