Direct conversion of syngas into methyl acetate by relay catalysis: From fabrication of active sites to process control

IF 3.5 3区工程技术 Q2 ENGINEERING, CHEMICAL

AIChE Journal Pub Date : 2024-11-30 DOI:10.1002/aic.18664

Suhan Liu, Gongli Wu, Yuqing Chen, Yaoyao Han, Mingchao Zhang, Jincan Kang, Min Tang, Krijn P. de Jong, Qinghong Zhang, Ye Wang, Kang Cheng

引用次数: 0

Abstract

The direct and selective conversion of syngas into C₂₊ oxygenates is challenging due to the complex reaction network. Here, we report a robust relay system for the direct synthesis of methyl acetate (MA) from syngas, which combines CuZnAlO_x/H-ZSM-5 for syngas to dimethyl ether (DME) with modified H-MOR for DME carbonylation. The dehydration of methanol to DME on H-ZSM-5 significantly enhanced the hydrogenation of CO on CuZnAlO_x, because of high DME equilibrium yields. Blocking of Brönsted acid sites with basic molecules or selective dealumination of 12-membered rings in H-MOR suppressed the zeolite coking. Besides, reaction temperatures above 240°C avoided H₂O poisoning of carbonylation sites inside 8-MR side pockets of H-MOR, further benefiting the catalytic stability. Eventually, this relay system provided a high MA selectivity of 75% and an acetic acid selectivity of 13% at a CO conversion of 65%, outperforming reported catalysts.

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来源期刊

AIChE Journal 工程技术-工程：化工

CiteScore

7.10

自引率

10.80%

发文量

411

审稿时长

3.6 months

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