Author(s)

Toshiyuki Masui, Shunji Uejima, Soichiro Tsujimoto, Nobuhito Imanaka

Department of Applied Chemistry, Faculty of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, Japan.

Catalytic activities for direct NO decomposition were investigated over C-type cubic Y₂O₃–Tb₄O₇–ZrO₂ prepared by a coprecipitation method. The NO decomposition activity was enhanced by partial substitution of the yttrium sites with terbium in a (Y_0.97Zr_0.03)₂O_3.03 catalyst, which shows high NO decomposition activity. Among the catalysts synthesized in this study, the (Y_0.67Tb_0.30Zr_0.03)₂O_3.33 catalyst exhibited the highest NO decomposition activity; NO conversion to N2 was as high as 67% at 900℃ in the absence of O₂ (NO/He atmosphere), and a relatively high conversion ratio was observed even in the presence of O₂ or CO₂, compared with those obtained over conventional direct NO decomposition catalysts. These results indicate that the C-type cubic Y₂O₃–Tb₄O₇–ZrO₂ catalyst is a new potential candidate for direct NO decomposition.

Nitrogen Monoxide; Direct Decomposition; Catalyst; Rare Earth Oxide; C-type Cubic Structure

T. Masui, S. Uejima, S. Tsujimoto and N. Imanaka, "Direct Decomposition of NO into N₂ and O₂ Over C-type Cubic Y₂O₃-Tb₄O₇-ZrO₂," Materials Sciences and Applications, Vol. 3 No. 10, 2012, pp. 733-738. doi: 10.4236/msa.2012.310107.