Cu Active Sites Confined In Mgal Layered Double Hydroxide For Hydrogenation Of Dimethyl Oxalate To Ethanol
CATALYSIS TODAY(2021)
摘要
The dimethyl oxalate (DMO) hydrogenation reaction is the key step of indirect synthesis of C2-C4 oxygenates (e. g., ethanol) from syngas. Copper-based catalysts have been extensively explored for DMO hydrogenation. However, the unstable copper active sites induced by metal-particle growth at high rection temperatures (e.g., > 553 K) is an impediment to the stable performance. Herein, we report a facile co-precipitation method to confine Cu active sites in the layered double hydroxide for the hydrogenation of DMO to ethanol. The effects of Mg/Al molar ratio on the catalytic performance were systematically investigated to get insights into the structureactivity relationship. The results indicate that the CuMgAl-LDH-1.25 catalyst possesses regular lamellar structures, highly dispersed Cu active sites, and moderate acidic sites, which synergistically achieves a stable performance with a DMO conversion of ca. 100 % and ethanol selectivity exceeding 83 % at 553 K, 3 MPa.
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关键词
Copper-based catalyst, Hydrotalcite, Dimethyl oxalate, Ethanol
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