Abstract
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 α-alumina substrate using a secondary growth method. Here, the H2/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 = ∞) 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.
Highlights
Year after year, the demand for lower olefins, such as ethylene and propylene, increases owing to their popularity as raw materials for various products, including fibers, plastics, and resins
The MTO reaction is a sequential process that transitions all the way from methanol through dimethyl ether (DME), olefins, paraffins, and aromatics via a double-cycle mechanism that was proposed by Olsbye et al [2]
An MFI-type zeolite membrane contactor that was synthesized using the cross-flow method was shown to be effective for MTO reactions
Summary
The demand for lower olefins, such as ethylene and propylene, increases owing to their popularity as raw materials for various products, including fibers, plastics, and resins To close this gap between demand and supply, faster, more efficient production processes must be developed and implemented. The MTO reaction is a sequential process that transitions all the way from methanol through dimethyl ether (DME), olefins, paraffins, and aromatics via a double-cycle mechanism that was proposed by Olsbye et al [2] Zeolites, such as SAPO-34 (Chabazite, CHA) and ZSM-5 (MFI), are used for various commercial applications, for example, as a catalyst for ion exchange reactions, for mesopore production via alkali treatment, and for dealumination via acid treatment [3,4,5,6]. Mohammad et al reported that the ZSM-5 catalyst in an MTO reaction was capable of 99.3% methanol conversion with 48.3% propylene selectivity over the course of 170 h under alkaline conditions [5]
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