Abstract—

An increase in the rate of catalytic CO oxidation for platinum nanocoatings was measured when the electrical stress of various polarity and value was applied to a coating from an external source. Under conditions of the experiment at 250°C, atmospheric pressure and the starting composition mixture of 4.8% CO + 10.2% O₂ + Ar, applying the positive stress of +10 or +30 V on a coating leads to increase in the rate of CO oxidation by 18 or 54%, respectively. Applying the negative stress of –10 or –30 V leads to small acceleration in oxidation by 4 or 8%. It is shown that the effect of applied stress does not depend on particle size in a coating and grows linearly with stress. Quantum-chemical calculations of heats of association of CO and O₂ with electrically neutral or electrically charged platinum cluster were performed. It was found that the creation of the positive charge on Pt₂ leads to decrease in the heat of CO association by 6.4 kcal/mol and increase in the heat of O₂ association by 4.7 kcal/mol, while the creation of the negative charge on Pt₂ leads to a small effect of decrease in the heat of CO association by 3.0 kcal/mol and increase in the heat of O₂ association by 4.2 kcal/mol. From the results, it is proposed to explain increase in the rate of catalytic CO oxidation on platinum electrically charged with the help of the external stress source.

中文翻译：

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电刺激铂纳米涂层在CO氧化中的催化活性

摘要-

当从外部来源向涂层施加各种极性和值的电应力时，测量了铂纳米涂层的催化CO氧化速率的增加。在250°C，大气压和4.8％CO + 10.2％O ₂ + Ar的起始成分混合物的实验条件下，在涂层上施加+10或+30 V的正应力会导致涂层速率的增加。 CO氧化分别增加18％或54％。施加–10或–30 V的负应力会导致4或8％的小氧化加速。结果表明，施加应力的效果不取决于涂层中的粒径，而是随应力线性增长。CO和O ₂缔合热的量子化学计算用电中性或带电的铂簇进行。发现在Pt _2上产生正电荷会导致CO缔合热降低6.4 kcal / mol，而在O ₂缔合热方面增加4.7 kcal / mol，而在Pt _2上产生负电荷Pt ₂导致CO缔合热降低3.0 kcal / mol以及O ₂缔合热增加4.2 kcal / mol的影响很小。从结果可以提出，借助于外部应力源可以解释带电的铂上的催化CO氧化速率的增加。