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Excellent Methanol to Olefin Performance of SAPO-34 Crystal Deriving from the Mixed Micropore, Mesopore, and Macropore Architecture
journal contribution
posted on 2020-03-12, 15:04 authored by Ying-Liang Zhu, Haowen Dai, Ying Duan, Qiang Chen, Meng ZhangHierarchical aluminosilicophosphate
SAPO-34 crystals with designed
micropore, mesopore, and macropore architecture are successfully prepared
via a simple in situ base etching; the volume ratio of macropore,
mesopore, and micropore could be appropriately regulated. With the
incorporation of macropore structures into the SAPO-34 zeolites, some
thin walls are formed simultaneously; these larger pores and thin
walls could certainly shorten the diffusion path length and improve
diffusion property, therefore increasing the lifetime as well as ethylene
plus propylene selectivity of SAPO-34 catalysts in methanol to olefin
reaction. The sample, with a volume ratio of micropore, mesopore,
and macropore of about 18:1:87, presents a longer lifetime of 206
min, as well as higher ethylene plus propylene selectivity of 84.35%,
in comparison to the conventional microporous sample of 106 min and
77.53%.