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Direct Decomposition of NO into N<sub>2</sub> and O<sub>2</sub> Over C-type Cubic Y<sub>2</sub>O<sub>3</sub>-Tb<sub>4</sub>O<sub>7</sub>-ZrO<sub>2</sub>
Department of Applied Chemistry, Faculty of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, Japan
Department of Applied Chemistry, Faculty of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, Japan
Department of Applied Chemistry, Faculty of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, Japan
Department of Applied Chemistry, Faculty of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, Japan
- 1 Department of Applied Chemistry, Faculty of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, Japan
- 2 Department of Applied Chemistry, Faculty of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, Japan
- 3 Department of Applied Chemistry, Faculty of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, Japan
- 4 Department of Applied Chemistry, Faculty of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, Japan
Materials Sciences and Applications·Volume 03 (2012)·Pages 733–738·Published 19 October 2012·DOI10.4236/msa.2012.310107
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Abstract
Catalytic activities for direct NO decomposition were investigated over C-type cubic Y 2 O 3 –Tb 4 O 7 –ZrO 2 prepared by a coprecipitation method. The NO decomposition activity was enhanced by partial substitution of the yttrium sites with terbium in a (Y 0.97 Zr 0.03 ) 2 O 3.03 catalyst, which shows high NO decomposition activity. Among the catalysts synthesized in this study, the (Y 0.67 Tb 0.30 Zr 0.03 ) 2 O 3.33 catalyst exhibited the highest NO decomposition activity; NO conversion to N2 was as high as 67% at 900℃ in the absence of O 2 (NO/He atmosphere), and a relatively high conversion ratio was observed even in the presence of O 2 or CO 2 , compared with those obtained over conventional direct NO decomposition catalysts. These results indicate that the C-type cubic Y 2 O 3 –Tb 4 O 7 –ZrO 2 catalyst is a new potential candidate for direct NO decomposition.
KeywordsNitrogen MonoxideDirect DecompositionCatalystRare Earth OxideC-type Cubic Structure
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