制备方法对CuO/CeO2-ZrO2催化CO低温氧化活性的影响

doi:10.3866/PKU.WHXB20101210

Abstract

Abstract:

CuO/CeO₂-ZrO₂ catalysts were prepared by microwave heating decomposition (one-step approach) and by microwave heating treatment of co-precipitation followed by impregnation (two-step approach). The catalysts were characterized by X-ray diffraction (XRD), low temperature N2 adsorption/ desorption, and H₂-temperature-programmed reduction (H₂-TPR). The catalytic activities of the catalysts for low temperature CO oxidation were investigated using a microreactor-gas chromatograph. The results showed that the one-step approach was more beneficial to CuO dispersion on the catalyst surface because of a strong interaction between CuO and CeO₂-ZrO₂ and to the improved reducibility of CuO, which resulted in higher catalytic activity. We conclude that finely dispersed and small CuO particles strongly interact with CeO₂-ZrO₂ are responsible for the high catalytic activity toward CO oxidation and that large CuO particles that do not interact with CeO₂-ZrO₂ inhibit the catalytic activity.

Key words: Catalytic activity, CuO/CeO₂-ZrO₂, CO oxidation, Microwave heating

YANG Zhi-Qiang, MAO Dong-Sen, GUO Qiang-Sheng, GU Lei. Effect of Preparation Method on the Activity of CuO/CeO₂-ZrO₂ Catalysts for Low Temperature CO Oxidation[J]. Acta Phys. -Chim. Sin. 2010, 26(12), 3278-3284. doi: 10.3866/PKU.WHXB20101210

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Effect of Preparation Method on the Activity of CuO/CeO₂-ZrO₂ Catalysts for Low Temperature CO Oxidation

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Effect of Preparation Method on the Activity of CuO/CeO2-ZrO2 Catalysts for Low Temperature CO Oxidation

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Effect of Preparation Method on the Activity of CuO/CeO₂-ZrO₂ Catalysts for Low Temperature CO Oxidation