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

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...

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Published in:Frontiers of chemical science and engineering Vol. 14; no. 2; pp. 267 - 274
Main Authors: Xu, Hao, Lei, Chi, Wu, Qinming, Zhu, Qiuyan, Meng, Xiangju, Dai, Daniel, Maurer, Stefan, Parvulescu, Andrei-Nicolae, Müller, Ulrich, Xiao, Fengshou
Format: Journal Article
Language:English
Published: Beijing Higher Education Press 01.04.2020
Springer Nature B.V
Subjects:
Alkenes
Ammonia
Catalysts
Chemistry
Chemistry and Materials Science
Deactivation
Diffusion rate
Industrial Chemistry/Chemical Engineering
Mass transfer
Methanol
Microporosity
Morphology
Nanotechnology
NMR
Nuclear magnetic resonance
Research Article
Surfactants
Zeolites
soft template
mesopores
SSZ-39 zeolite
organosilane surfactant
MTO reaction
mass transfer
ISSN:2095-0179, 2095-0187
Online Access:Get full text
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Summary: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-1-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, N 2 sorption, scanning electron microscopy, temperature programmed desorption of ammonia, and magic angle spinning nuclear magnetic resonance of 27 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.
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content type line 14
ISSN:2095-0179
2095-0187
DOI:10.1007/s11705-019-1845-9