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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Fabrication of active Cu-Zn nanoalloys on H-ZSM5 zeolite for enhanced dimethyl ether synthesis via syngas
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Fabrication of active Cu-Zn nanoalloys on H-ZSM5 zeolite for enhanced dimethyl ether synthesis via syngas

机译：在H-ZSM5沸石上制备活性Cu-Zn纳米合金，以通过合成气增强二甲醚的合成

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摘要

One-step conversion of CO and H2 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 °C. After H2 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.
机译：迄今为止，CO和H2一步转化为二甲醚（DME）仍然具有挑战性。这项工作描述了一种有前途的双功能Cu / ZnO / H-ZSM5催化剂，该催化剂通过新颖的双金属溅射方法制备用于此类转化。溅射的催化剂由分散良好的约5 nm的Cu-ZnO纳米颗粒组成，这些纳米颗粒物理锚固在酸性沸石载体上。沉积的金属与沸石之间的弱相互作用显然将还原温度降低了50°C。 H2还原后，在Cu-ZnO纳米颗粒的表面观察到独特的Cu-Zn纳米合金层，从而降低了CO吸附的活化能。表面合金层和内部Cu-ZnO位点在提高CO转化率和促进DME选择性方面起着协同催化作用。与传统的浸渍催化剂相比，CO转化率提高了近四倍，DME的选择性提高到92.1％。所提出的概念对于开发具有在功能性载体上负载的双金属组分的高活性催化剂是有益的。

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