Size and diffusion effects on the oxidation of formic acid and ethanol on platinum nanoparticles
Size and diffusion effects on the oxidation of formic acid and ethanol on platinum nanoparticles
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DOI：
10.1016/j.elecom.2011.08.046
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发表时间：
2011-11
影响因子：
5.4
通讯作者：
S. Chumillas;Carlos Busó-Rogero;J. Solla-Gullón;F. Vidal-Iglesias;E. Herrero;J. Feliu
中科院分区：
文献类型：
--
作者：
S. Chumillas;Carlos Busó-Rogero;J. Solla-Gullón;F. Vidal-Iglesias;E. Herrero;J. Feliu
研究了不同负载量的球形铂纳米粒子对甲酸和乙醇的氧化反应。催化剂负载量的增加导致反应物在催化层内部的扩散通量降低，从而导致表观活性降低。在某些情况下，就像乙醇氧化一样，它还可能影响产物的扩散。因此，应优化支撑层的结构和催化剂的装载量，以获得最大的催化剂利用率。最后，这些扩散效应可能掩盖了纳米粒子的一些重要的催化活性增加。在甲酸的情况下，非常小的纳米颗粒的活性得到了显著的提高。
Formic acid and ethanol oxidations on spherical platinum nanoparticles dispersed on carbon with different loadings have been studied. The increasing loading of the catalyst leads to a lower diffusion flux of reactants in the internal parts of the catalyst layer, resulting in a lower apparent activity. In some cases, as in ethanol oxidation, it may also affect the diffusion of the products. As a practical consequence, the structure of the supporting layer and the catalyst loading should be optimized so that the maximum catalyst utilization is obtained. Finally, these diffusion effects may mask some important catalytic activity increase of the nanoparticles. In the case of formic acid, a significant increase in the activity is obtained for very small nanoparticles.