期刊
MEMBRANES
卷 10, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/membranes10020026
关键词
zeolite membrane; MFI-type zeolite; membrane contactor; MTO reaction; silicalite-1 coating; catalyst regeneration
A membrane for controlling methanol-to-olefin (MTO) reactions was developed, which featured an MFI-type zeolite membrane (Si/Al = 25) that was synthesized on a porous alpha-alumina substrate using a secondary growth method. Here, the H-2/SF6 permeance ratios were between 150 and 450. The methanol conversion rate was 70% with 38% ethylene selectivity and 28% propylene selectivity as determined using a cross-flow membrane contactor. In order to improve the olefin selectivity of the membrane, the MFI zeolite layer (Si/Al = infinity) was coated on an MFI-type zeolite membrane (Si/Al = 25). Using this two-layered membrane system, the olefin selectivity value increased to 85%; this was 19% higher than the value obtained during the single-layer membrane system.
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