Decomposition of nitrous oxide over supported rhodium catalysts and dependency on feed gas composition |
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Authors: | Junko Oi Akira Obuchi Gratian R. Bamwenda Atsushi Ogata Hiroshi Yagita Satoshi Kushiyama Koichi Mizuno |
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Affiliation: | aAtmospheric Environmental Protection Department, National Institute for Resources and Environment, 16-3 Onogawa, Tsukuba, Ibaraki 305, Japan |
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Abstract: | The catalytic decomposition of nitrous oxide to nitrogen and oxygen was studied overRh/ZnO, Rh/CeO2, Rh/ZSM-5, CuZSM-5 and CoAlCO3HT (hydrotalcite). The effects of metal loading and calcination conditions upon the catalytic performance were examined on Rh/ZnO. A 0.5 wt.% Rh/ZnO catalyst was found to be the most active catalyst, whose reaction rate was 4.0 × 104 μmol(N2O) · g−1 · h−1 under the conditions of 950 ppm N2O and 5% O2 at 300°C. The oxidized Rh/ZnO showed a higher activity than that calcined in a reducing atmosphere. The TEM and EDX observations revealed the formation of particles of ca. 50Åin diameter. They consisted of rhodium and zinc oxides as major and minor components, respectively. The activities of all these catalysts decreased when NO2 and H2O were added to the feed. |
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Keywords: | Rhodium Nitrous oxide Decomposition ZnO CeO2 ZSM-5 Hydrotalcite |
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