Organosilane surfactant-assisted synthesis of mesoporous SSZ-39 zeolite with enhanced catalytic performance in the methanol-to-olefins reaction  

作　　者：Hao Xu Chi Lei Qinming Wu Qiuyan Zhu Xiangju Meng Daniel Dai Stefan Maurer Andrei-Nicolae Parvulescu Ulrich Muller Fengshou Xiao 

机构地区：[1]Key Laboratory of Applied Chemistry of Zhejiang Province,Department of Chemistry,Zhejiang University,Hangzhou 310028,China [2]BASF Catalysts(Shanghai)Co.,Ltd.,Shanghai 201206,China [3]BASF SE,Ludwigshafen 67056,Germany

出　　处：《Frontiers of Chemical Science and Engineering》2020年第2期267-274,共8页化学科学与工程前沿（英文版）

基　　金：the National Key Research and Development Program of China(Grant No.2017YFC0211101);the National Natural Science Foundation of China(Grant Nos.21333009,21703203 and 21673205).

摘　　要：SSZ-39 zeolite with AEI framework structure is a good catalyst candidate for the methanol-to-olefins(MTO)reaction.However,the diffusion limitation and coke formation often results in fast deactivation of the SSZ-39 zeolite catalyst.One solution for this challenge is to introduce mesoporosity in the SSZ-39 zeolite.Herein,we report the synthesis of mesoporous SSZ-39 zeolite using an organosilane surfactant,,-dimethyl--(3-(trimethoxysilyl)propyl)octan-1-aminium chloride,as a mesopore template and,-dimethyl--2,6-dimethylpiperidinium as a micropore template.The obtained zeolites were characterized by X-ray diffraction,N sorption,scanning electron microscopy,temperature programmed desorption of ammonia,and magic angle spinning nuclear magnetic resonance of Al.The results show that the mesoporous SSZ-39 zeolite has high crystallinity,meso/microporosity,high surface area,cuboid morphology,and abundant acidic sites.More importantly,this mesoporous SSZ-39 zeolite exhibits enhanced catalyst lifetime in the MTO reaction due to the presence of mesoporosity for fast mass transfer,compared with a conventional SSZ-39 zeolite without mesoporosity.

关 键 词：SSZ-39 ZEOLITE MESOPORES ORGANOSILANE surfactant MTO REACTION soft template mass transfer 

分 类 号：O64[理学—物理化学]