The oxidation of carbon monoxide on Pt/Al2O3 containing a metal oxide.

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概要

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• By using a three-way catalyst containing a metal oxide, CO is removed as CO<SUB>2</SUB> even in the "rich" region of the air/fuel ratio. In order to elucidate the mechanism of this action of the added metal oxide, the reaction of CO with O<SUB>2</SUB> on a Pt–V<SUB>2</SUB>O<SUB>5</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB> catalyst was investigated using a rectangular pulse-reaction apparatus. In the CO–O<SUB>2</SUB> reaction on a Pt/Al<SUB>2</SUB>O<SUB>3</SUB> catalyst, a significant amount of unreacted CO was exhausted in the "rich" region of the reactants. Furthermore, the conversion of CO decreased markedly with an increase in the CO/O<SUB>2</SUB> ratio in the reactants. In the CO–O<SUB>2</SUB> reaction on the Pt–V<SUB>2</SUB>O<SUB>5</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB> catalyst, on the other hand, the conversion of CO was high and did not decrease markedly with an increase in the CO/O<SUB>2</SUB> ratio in the "rich" region. As for the reaction on the Pt–V<SUB>2</SUB>O<SUB>5</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB> at 558 K and above, the CO was completely removed as CO<SUB>2</SUB> at any of the CO/O<SUB>2</SUB> ratios examined. These effects of the added V<SUB>2</SUB>O<SUB>5</SUB> were found to be due to: (i) the reaction of CO with an oxygen of V<SUB>2</SUB>O<SUB>5</SUB> in the Pt–<SUB>2</SUB>O<SUB>5</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB> catalyst and (ii) the enhanced oxidation of CO with a gaseous O<SUB>2</SUB> on the Pt/Al<SUB>2</SUB>O<SUB>3</SUB> catalyst upon the addition of V<SUB>2</SUB>O<SUB>5</SUB>. On the basis of the kinetics of the oxidation of CO with the oxygen of V<SUB>2</SUB>O<SUB>5</SUB> in the Pt–V<SUB>2</SUB>O<SUB>5</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB> and Pt black–V<SUB>2</SUB>O<SUB>5</SUB> mixtures, its mechanism was proposed to be as follows; the oxygen of V<SUB>2</SUB>O<SUB>5</SUB> at the Pt–V<SUB>2</SUB>O<SUB>5</SUB> interface is activated by contact with Pt (this activated oxygen is denoted by [Pt···O···V]). The oxidation of CO with the oxygen of the Pt–V<SUB>2</SUB>O<SUB>5</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB> and Pt black–V<SUB>2</SUB>O<SUB>5</SUB> mixtures proceeds according to the following two steps. Step I is the reaction of a gaseous CO with the active oxygen at the Pt–V<SUB>2</SUB>O<SUB>5</SUB> interface, [Pt···O···V], to form CO<SUB>2</SUB> and a reduced site, [Pt V]. Step II is the oxidation of the reduced site with the bulk oxygen in V<SUB>2</SUB>O<SUB>5</SUB> to reproduce [Pt···O···V]. The enhanced oxidation of CO with a gaseous O<SUB>2</SUB> caused by the addition of V<SUB>2</SUB>O<SUB>5</SUB> to Pt/Al<SUB>2</SUB>O<SUB>3</SUB> was found also to be understandable in terms of the active site, [Pt···O···V], where the reduced site, [Pt V], is oxidized by the gaseous O<SUB>2</SUB> to reproduce [Pt···O···V] instead of the bulk oxygen in V<SUB>2</SUB>O<SUB>5</SUB>.

• 公益社団法人 日本化学会の論文

著者

• MURAKAMI Yuichi

  Department of Applied Chemistry, School of Engineering, Nagoya University

• Miyamoto Akira

  Department Of Applied Chemistry Graduate School Of Engineering Tohoku University

• Kosaki Yukio

  Department of Synthetic Chemistry, Faculty of Engineering, Nagoya University

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