N₂O decomposition catalyzed by K⁺-doped Bi_0.02Co

Abstract

K⁺-doped Bi_0.02Co was investigated as catalyst for N₂O decomposition. It was found that the catalytic performance of the Bi_0.02Co catalyst, which was prepared by coprecipitation method, can be effectively modified by potassium cations via impregnation. The optimized K_0.01Bi_0.02Co catalyst exhibited much higher activity compared with Bi_0.02Co and K_0.01Co for the reaction in feed gas 0.2% N₂O/Ar, irrespective of the presence or absence of impurity gas(volume fraction) 5%O₂, 2%H₂O, 0.12%NO and 10%CO₂. Characterization of the catalysts with H₂ temperature programmed reduction(H2-TPR) and O₂ temperature programmed desorption(O₂-TPD) indicate that the Co―O bond in Bi_0.02Co was weakened by the K⁺ doping, and hence the K_0.01Bi_0.02Co catalyst has much higher turnover frequency(TOF) than Co₃O₄ spinel and Bi_0.02Co for the reaction.

Keywords

N₂O / Turnover frequency / Reaction order / H₂ temperature programmed reduction / O₂ temperature programmed desorption

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