A Study of Catalysis by Uranium Oxide and Its Mixed Catalysts. IX. A Catalytic Reduction of Nitric Oxide with Carbon Monoxide
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概要
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The reduction of NO with CO over the uranium oxide catalyst and its mixed catalysts with alkali metal oxide or alkaline earth metal oxide has been investigated using conventional flow and pulse reactors at temperatures of 250 to 450 °C under atmospheric pressure. The activity of the uranium oxide catalyst without any additive was higher than that of the Fe<SUB>2</SUB>O<SUB>3</SUB> catalyst, although it was inferior to that of the CuO–Cr<SUB>2</SUB>O<SUB>3</SUB> catalyst. The addition of alkali metal oxide or alkaline earth metal oxide to uranium oxide, particularly in the case of Cs<SUB>2</SUB>O or K<SUB>2</SUB>O, was effective in enhancing the catalyst activity. The W/F-conversion curves revealed that the reduction of NO to N<SUB>2</SUB> proceeds consecutively, passing through N<SUB>2</SUB>O as a gas-phase intermediate. The reaction rates were formulated as <I>r</I>=<I>kP</I><SUB>CO</SUB><SUP>1.0</SUP><I>P</I><SUB>NO</SUB><SUP>0.4</SUP>. The kinetic study suggested a redox reaction sequence. The oxidation states of the catalysts were discussed on the basis of X-ray diffractograms.
- 公益社団法人 日本化学会の論文
著者
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Nozaki Fumio
Department Of Applied Chemistry Faculty Of Engineering Chiba University
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Mano Yoshikazu
Department of Industrial Chemistry, Faculty of Engineering, Chiba University
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Matsukawa Fumio
Department of Industrial Chemistry, Faculty of Engineering, Chiba University
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- A Study of Catalysis by Uranium Oxide and Its Mixed Catalysts. IX. A Catalytic Reduction of Nitric Oxide with Carbon Monoxide