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Control of Surface Barriers in Mass Transfer to Modulate Methanol‐to‐Olefins Reaction over SAPO‐34 Zeolites
Author(s) -
Peng Shichao,
Gao Mingbin,
Li Hua,
Yang Miao,
Ye Mao,
Liu Zhongmin
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202009230
Subject(s) - catalysis , mass transfer , zeolite , nanoporous , chemistry , chemical engineering , methanol , selectivity , molecule , mass transport , reaction mechanism , photochemistry , organic chemistry , chromatography , engineering , engineering physics
Mass transfer of guest molecules has a significant impact on the applications of nanoporous crystalline materials and particularly shape‐selective catalysis over zeolites. Control of mass transfer to alter reaction over zeolites, however, remains an open challenge. Recent studies show that, in addition to intracrystalline diffusion, surface barriers represent another transport mechanism that may dominate the overall mass transport rate in zeolites. We demonstrate that the methanol‐to‐olefins (MTO) reaction can be modulated by regulating surface permeability in SAPO‐34 zeolites with improved chemical liquid deposition and acid etching. Our results explicitly show that the reduction of surface barriers can prolong catalyst lifetime and promote light olefins selectivity, which opens a potential avenue for improving reaction performance by controlling the mass transport of guest molecules in zeolite catalysis.