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首页> 外文期刊>Catalysis science & technology >Cu supported on thin carbon layer-coated porous SiO2 for efficient ethanol dehydrogenation
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Cu supported on thin carbon layer-coated porous SiO2 for efficient ethanol dehydrogenation

机译：铜支持薄碳layer-coated多孔二氧化硅为乙醇脱氢效率

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We report a designed Cu/C/SiO2 composite catalyst, which shows a high acetaldehyde selectivity (up to similar to 98%) and good stability for a 60 h test at 260 degrees C in ethanol dehydrogenation. Various characterization techniques demonstrate that the carbon covers the Si-OH groups on silica and promotes the reduction of Cu+ to Cu-0. This reduces the concentration of active sites for secondary reactions of CH3CHO, which leads to a high initial selectivity (similar to 93%) as compared to that of Cu/SiO2 (similar to 76%). Moreover, the chemical interaction between Cu and SiO2 of the C/SiO2 support, verified by X-ray photoelectron spectroscopy, enhances the interaction between the metal and the support and thus contributes to prevention of the agglomeration of Cu particles, which is the reason for the good catalytic stability of Cu/C/SiO2. Thus, this study is an example of how careful design of the catalyst can strongly improve the catalytic performance.
机译：我们报告一个设计铜/ C /二氧化硅复合催化剂,这显示了一个高乙醛选择性(类似于98%)60 h和稳定性好测试在乙醇脱氢的260摄氏度。各种表征技术演示硅碳颗粒覆盖了组织并促进减少铜+ Cu-0。降低了活性中心的浓度二次反应的浓度,导致最初的高选择性(类似于93%)比铜/二氧化硅(类似于76%)。此外,化学铜和之间的相互作用二氧化硅的C /二氧化矽的支持,验证了x射线光电子能谱,提高金属间的相互作用和支持从而有助于预防的铜粒子的聚集,这是良好的催化稳定性的原因铜/ C /二氧化矽。精心设计的催化剂可以强烈提高催化性能。

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