Morphological impact of manganese-cerium oxides on ethanol oxidation
Morphological impact of manganese-cerium oxides on ethanol oxidation
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DOI：
10.1039/c1cy00308a
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发表时间：
2011-01-01
影响因子：
5
通讯作者：
Shen, Wenjie
中科院分区：
文献类型：
--
作者：
Li, Huaju;Qi, Gongshin;Shen, Wenjie
纳米粒子的形状会显著改变其催化性能，但这种形态依赖现象的内在化学性质仍然不太清楚。在这里，我们报告的{100}和{111}面包围的MnOx-CeO 2纳米材料的形态显着影响乙醇氧化的反应速率和产物选择性。动力学研究表明，{100}面和{111}面具有非常接近的表观活化能，表明共同的锰活性物种，但由于固有的更高的储氧能力，{100}面上的比反应速率比{111}面上的大两倍。这些结果表明，在纳米水平上控制二元氧化物的形貌可以显著提高其催化性能。
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 MnOx-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.