Effect of Cesium Modification on CuO/CeO₂ Catalysts for the Catalytic Decomposition of N₂O

Abstract

A series of Cs-modified CuO/CeO₂ mixed oxide catalysts was prepared for enhancing the stable activity of N₂O decomposition. It was found that Cs modification promoted the catalytic performance of CuO/CeO₂ catalysts significantly. The 1%Cs-CuO/CeO₂ catalyst exhibited the best activity, and the conversion of N₂O reached 100% at 380 °C in the presence of 2% O₂. The catalytic behaviors were investigated by means of XRD, N₂ adsorption iso-therms, XPS, H₂-TPR(TPR: temperature-programmed reduction), CO-IR, O₂-TPD(TPD: temperature-programmed desorption) and diffused reflectance infrared Fourier transform spectorscopy(DRIFTs). The results revealed that Cs modification promoted the activity and the oxygen resistance by enhancing the desorption of surface oxygen species and increasing the content of Ce³⁺. CO-DRIFTs revealed that Ce³⁺ could efficiently facilitate the regeneration of active Cu⁺ sites by an oxygen migration step. The possible reaction mechanism was also discussed.

Keywords

Cs-Modified CuO/CeO₂ / N₂O decomposition / Reaction mechanism

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