Organosilane surfactant-assisted synthesis of mesoporous SSZ-39 zeolite with enhanced catalytic perf

• 作 者: Hao Xu Chi Lei Qinming Wu Qiuyan Zhu Xiangju Meng Daniel Dai Stefan Maurer Andrei-Nicolae Parvulescu Ulrich Müller Fengshou Xiao
• 机 构: Key Laboratory of Applied Chemistry of Zhejiang Province, Department of Chemistry, Zhejiang Universi
• 出 处: 化学科学与工程前沿
• 发表日期: 2004年期
• 关键词: SSZ-39 zeolite mesopores organosilane surfactant MTO reaction soft template mass

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,N,N-dimethyl-N-(3-(trimethoxysilyl)propyl)octan-l-aminium chloride,as a mesopore template and N,N-dimethyl-cis-2,6-dimethylpiperidinium as a micropore template.The obtained zeolites were characterized by X-ray diffraction,N2 sorption,scanning electron microscopy,temperature programmed desorption of ammonia,and magic angle spinning nuclear magnetic resonance of 27Al.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-39zeolite without mesoporosity.