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论文类型：期刊论文

发表时间：2014-06-21

发表刊物：JOURNAL OF MATERIALS CHEMISTRY A

收录刊物：SCIE、EI、Scopus

卷号：2

期号：23

页面范围：8637-8643

ISSN号：2050-7488

摘要：One-step conversion of CO and H-2 to dimethyl ether (DME) is still challenging to date. This work describes a promising bifunctional Cu/ZnO/H-ZSM5 catalyst prepared by a novel bimetallic sputtering method for such conversions. The sputtered catalyst consisted of well-dispersed Cu-ZnO nanoparticles of about 5 nm, which were physically anchored on an acidic zeolite support. The weak interaction between the deposited metal and zeolite clearly lowered the reduction temperature by 50 degrees C. After H-2 reduction, a unique Cu-Zn nanoalloy layer was observed on the surface of the Cu-ZnO nanoparticles, reducing the activation energy of CO adsorption. The surface alloy layer and inner Cu-ZnO sites play a cooperative catalytic role in improving the CO conversion and promoting DME selectivity. Compared to conventional impregnated catalysts, the CO conversion was enhanced by almost four times and the DME selectivity was promoted to as high as 92.1%. The proposed concept is beneficial for developing highly-active catalysts with bimetallic components supported on a functional support.