Publication Date:
2019
Description:
〈h3〉Abstract〈/h3〉
〈p〉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, 〈em〉N〈/em〉,〈em〉N〈/em〉-dimethyl-〈em〉N〈/em〉-(3-(trimethoxysilyl)propyl)octan-1-aminium chloride, as a mesopore template and 〈em〉N〈/em〉,〈em〉N〈/em〉-dimethyl-〈em〉cis〈/em〉-2,6-dimethylpiperidinium as a micropore template. The obtained zeolites were characterized by X-ray diffraction, N〈sub〉2〈/sub〉 sorption, scanning electron microscopy, temperature programmed desorption of ammonia, and magic angle spinning nuclear magnetic resonance of 〈sup〉27〈/sup〉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.〈/p〉
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Print ISSN:
2095-0179
Electronic ISSN:
2095-0187
Topics:
Chemistry and Pharmacology
,
Process Engineering, Biotechnology, Nutrition Technology
