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Morphological impact of manganese-cerium oxides on ethanol oxidation

机译:锰氧化物对乙醇氧化的形态影响

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The shape of nanoparticles alters their catalytic performance significantly, but the intrinsic chemical nature of this morphology-dependent phenomenon is still less understood. Here, we report that the morphology of MnO_x-CeO2 nanomaterials that are enclosed by {100} and {111} facets considerably affected the reaction rate and the product selectivity in ethanol oxidation. Kinetic investigation revealed that the {100} and the {111} planes had very close apparent activation energies, indicative of the common manganese active species, but the specific reaction rate on the {100} plane was two times greater than that on the {111} plane because of the intrinsically higher oxygen storage capacity. These results evidence that morphology control of binary oxides at the nanometre level could promote their catalytic properties substantially.
机译:纳米颗粒的形状显着改变了它们的催化性能,但是这种依赖形态的现象的内在化学性质仍然不太了解。 在这里,我们报告说,由{100}和{111}方面包含的MNO_X-CEO2纳米材料的形态极大地影响了乙醇氧化中的反应速率和产物选择性。 动力学研究表明,{100}和{111}平面具有非常接近的明显激活能,表明了公共锰活性物种,但是{100}平面上的特定反应速率是{111的两倍 }平面由于本质上较高的氧气存储能力。 这些结果证明,纳米水平上二元氧化物的形态控制可以大大促进其催化特性。

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