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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >The Nature of the Molybdenum Surface in Iron Molybdate. The Active Phase in Selective Methanol Oxidation
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The Nature of the Molybdenum Surface in Iron Molybdate. The Active Phase in Selective Methanol Oxidation

机译:钼酸铁中钼表面的性质。选择性甲醇氧化中的活性相

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摘要

The surface structure of iron molybdate is of great significance since this is the industrial catalyst for the direct selective oxidation of methanol to formaldehyde. There is a debate concerning whether Fe2(MoO4)3 acts as a benign support for segregated MoO3 or if there is an intrinsic property of the surface structure which facilitates its high catalytic efficacy. This study provides new insights into the structure of this catalyst, identifying a bound terminating layer of octahedral Mo units as the active and selective phase. Here we examine whether only 1 monolayer of Mo on iron oxide alone is efficacious for this reaction. For a 1 ML MoO_x shell—Fe2O3 core catalyst the Mo remains at the surface under all calcination procedures while exhibiting high selectivity and activity. The work highlights how catalyst surfaces are significantly different from bulk structures and this difference is crucial for catalyst performance.
机译:钼酸铁的表面结构具有重要意义,因为这是用于将甲醇直接选择性氧化为甲醛的工业催化剂。关于Fe2(MoO4)3是否充当偏析的MoO3的良性载体,或者表面结构是否具有促进其高催化效率的内在特性,存在争议。这项研究提供了对这种催化剂结构的新见解,确定了八面体Mo单元的一个绑定终止层为活性相和选择性相。在这里,我们检查仅在氧化铁上只有1个单分子层的Mo对于该反应是否有效。对于1 ML MoO_x壳-Fe2O3核心催化剂,在所有煅烧程序中,Mo都保留在表面,同时表现出高选择性和活性。这项工作突出了催化剂表面与本体结构之间的显着差异,这种差异对于催化剂的性能至关重要。

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