Bifunctional oxidation of ammonia with metal oxide-Pt/Al2O3 mechanical mixtures.

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概要

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• Selectivity to N<SUB>2</SUB> in the reaction of NH<SUB>3</SUB> with metal oxides has been markedly increased by the addition of Pt/Al<SUB>2</SUB>O<SUB>3</SUB> to the metal oxides, whereas the activity of the metal oxides has not been changed. The metal oxides on their own have oxidized NH<SUB>3</SUB> to NO, NO<SUB>2</SUB>, and N<SUB>2</SUB>O as well as N<SUB>2</SUB>, and furthermore, the selectivities in the reaction with metal oxides have depended markedly on the reaction temperature and inlet concentration of NH<SUB>3</SUB> in the pulse. In the oxidation of NH<SUB>3</SUB> with metal oxide–Pt/Al<SUB>2</SUB>O<SUB>3</SUB> mechanical mixtures, N<SUB>2</SUB> has been selectively produced irrespective of the reaction temperature and the inlet concentration of NH<SUB>3</SUB> in the pulse. The activity of the mixtures has been shown, on the other hand, to be the same as that of the metal oxides. All of the experimental data have been explained in terms of the following scheme: In the oxidation of NH<SUB>3</SUB> with metal oxide–Pt/Al<SUB>2</SUB>O<SUB>3</SUB> mixtures, NH<SUB>3</SUB> is at first oxidized by metal oxides to form NO<I><SUB>x</SUB></I>(NO, NO<SUB>2</SUB>, and N<SUB>2</SUB>O) and N<SUB>2</SUB>, then the NO<I><SUB>x</SUB></I> components is transfered through the gas phase from the metal oxides to Pt particles on Al<SUB>2</SUB>O<SUB>3</SUB>, and finally the NO<I><SUB>x</SUB></I>. components react with NH<SUB>3</SUB> on Pt particles to form N<SUB>2</SUB> selectively.

• 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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