Reduction Rate of NO, NO<SUB>2</SUB> and Equimolal Mixture of NO-NO<SUB>2</SUB> with NH<SUB>3</SUB> over Various Metal Oxide Catalysts Supported on TiO<SUB>2</SUB>
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For the purpose to establish the reduction mechanism of NO<SUB>x</SUB> with NH<SUB>3</SUB>, the higher activity catalysts and the operation conditions, the reduction rates of NO<SUB>x</SUB> (NO+NO<SUB>2</SUB>) of different compositions over the various metal oxide (V<SUB>2</SUB>O<SUB>5</SUB>, WO<SUB>3</SUB>, MoO<SUB>3</SUB>, Cr<SUB>2</SUB>O<SUB>3</SUB>, Mn<SUB>2</SUB>O<SUB>3</SUB>, Fe<SUB>2</SUB>O<SUB>3</SUB>, Co<SUB>3</SUB>O<SUB>4</SUB>, NiO, CuO, ZnO) catalysts supported on TiO<SUB>2</SUB> (average diameter: 1.0mm) were investigated together with the examination of the oxidation of NO to NO<SUB>2</SUB>with O<SUB>2</SUB> the decomposition of NO<SUB>2</SUB> to NO, etc.. The experiments were carried out using a flow reactor (I. D.: 12.0mm) at 250, 550°C. Inlet gas concentrations were 500ppmNO<SUB>x</SUB> (NO, NO<SUB>2</SUB>, NO-NO<SUB>2</SUB> equimolal mixture)-0 or 350-4140ppmNH<SUB>3</SUB> (mainly 667ppmNH<SUB>3</SUB>)-5%O<SUB>2</SUB>-0 or 10%H<SUB>2</SUB>O-N<SUB>2</SUB> for the reduction of NO<SUB>x</SUB>, the oxidation of NO and the decomposition of NO<SUB>2</SUB>. The apace velocity was mainly 1.1×10<SUP>5</SUP>hr<SUP>-1</SUP>.<BR>It was found that the reduction rate of equimolal mixture of NO and NO<SUB>2</SUB> over every metal oxide catalysts employed was markedly high and that the catalysts (V<SUB>2</SUB>O<SUB>5</SUB>, WO<SUB>3</SUB>, MoO<SUB>3</SUB>) with higher reduction activity for NO than that for NO<SUB>2</SUB>, the catalysts (Mn<SUB>2</SUB>O<SUB>3</SUB>, Co<SUB>3</SUB>O<SUB>4</SUB>, Cr<SUB>2</SUB>O<SUB>3</SUB>, NiO) with higher reduction activity for NO<SUB>2</SUB> than that for NO and catalysts (Fe<SUB>2</SUB>O<SUB>3</SUB>, CuO, ZnO) with the similar activity for reduction of both NO and NO<SUB>2</SUB> existed. However, the overall reactions were given by the following equations for every metal oxide catalyst.<BR>For NO system: NO+NH<SUB>3</SUB>+ (1/4) O<SUB>2</SUB>→N<SUB>2</SUB>+ (3/2) H<SUB>2</SUB>O<BR>For NO<SUB>2</SUB> system: NO<BR>2+ (4/3) NH<SUB>3</SUB>→ (7/6) N<SUB>2</SUB>+2H<SUB>2</SUB>O<BR>For equirnolal mixture of NO-NO<SUB>2</SUB> system: NO+NO<SUB>2</SUB>+2NH<SUB>3</SUB>→2N<SUB>2</SUB>+3H<SUB>2</SUB>O<BR>Also, the correlation between the activity for NO-reduction with NH<SUB>3</SUB> and that for NO-oxidation with O<SUB>2</SUB> was not found from the apparent rate of NO<SUB>2</SUB> gas-formation, but the correlation between the activity for NO<SUB>2</SUB>-reduction with NH<SUB>3</SUB> and that for NO<SUB>2</SUB>-decomposition to NO was found.
- 一般社団法人 日本エネルギー学会の論文
一般社団法人 日本エネルギー学会 | 論文
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