Cu/ZnO Catalysts Derived from Bimetallic Metal-Organic Framework for Dimethyl Ether Synthesis from Syngas with Enhanced Selectivity and Stability

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Fuping LiShaomin Liu

Abstract

Direct conversion of syngas to dimethyl ether (DME) through the intermediate of methanol allows more efficient DME production in a simpler reactor design relative to the conventional indirect route. Although Cu/ZnO-based multicomponent catalysts are highly active for methanol synthesis in this process, the sintering issue of Cu during the prolonged reaction generally deteriorates their performance. In this work, Cu/ZnO catalysts in a novel octahedron structure are prepared by a two-step pyrolysis of Zn-doped Cu-BTC metal-organic framework (MOF) in N2 and air. The catalyst CZ-350/A, hybrid of MOF-derived Cu/ZnO sample CZ-350 and γ-Al2 O3 for methanol dehydration, displays the best activity for DME formation (7.74% CO conversion and 70.05% DME selectivity) with the lowest deterioration rate over 40 h continuous reaction. Such performance is superior to its counterpart CZ-CP/A made via the conventional coprecipitation method. This is mainly due to the confinement of Cu nanoparticles within the octahedron matrix hindering their migration and aggregation. Besides, partial reduction of ZnO in the activated CZ-350 prompts the formation of Cu+ -O-Zn, further facilitating the DME production with the highest selectivity compared to liter...Continue Reading

References

Apr 21, 2012·Science·Malte BehrensRobert Schlögl
Jun 4, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Manas K BhuniaAlexandra Navrotsky
May 21, 2016·Science·Sebastian KuldJens Sehested
Apr 6, 2018·Chemical Science·Peipei ZhangNoritatsu Tsubaki
Sep 25, 2018·Journal of the American Chemical Society·Fei HuangDing Ma

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