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CO2 conversion over Cu-Mo2C catalysts: effect of the Cu promoter and preparation method

机译：二氧化碳转换在Cu-Mo2C催化剂:效果铜促进剂及制备方法

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摘要

Mo2C-Based catalysts constitute a promising class of materials for CO2 hydrogenation to high added-value products. In this work, we show that methanol formation can be significantly enhanced by the addition of Cu. Moreover, the preparation method of the Cu-Mo2C catalysts can significantly affect the catalytic performance. Synthesis via the sol-gel auto-combustion route leads not only to the most active material, achieving 30 mol% CO2 conversion at 325 degrees C and 45 bar, but also to the most selective towards methanol (similar to 50 C-mol% at 5 mol% conversion). This performance is slightly inferior for the catalyst prepared with the solvothermal method. Conversely, the catalyst synthesized with the solid state route presents by a long way the worst activity and selectivity in the reaction. We show with spectroscopy and temperature programed studies that Cu addition and the synthesis method modify the population, type and strength of the sites available for CO2 and H-2 activation on the surface and hence the catalytic performance. The results suggest that strong interaction between the Cu and Mo2C phases and formation of Mo2C-Cu+ interfaces are required for the efficient hydrogenation of CO2 to methanol.
机译：Mo2C-Based催化剂构成承诺类对二氧化碳加氢材料高附加值的产品。甲醇形成可以显著增强铜的添加。Cu-Mo2C催化剂可以显著的方法影响催化性能。溶胶-凝胶法燃烧自动路线不仅最活跃的物质,实现30 mol %二氧化碳转换在325摄氏度和45条,但是也最对甲醇选择性(类似于50 C-mol % 5摩尔%转换)。催化剂的性能略差准备与solvothermal方法。相反,合成的催化剂固态的路线是通过很长一段路糟糕的反应活性和选择性。我们用光谱学和温度显示项目研究铜和合成方法修改数量,类型和的网站用于CO2和h2o表面活化,因此催化的性能。铜和Mo2C阶段和之间的交互Mo2C-Cu +接口所需的形成甲醇的高效加氢的二氧化碳。

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