Citation:
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 Physico-Chimica Sinica,
;2010, 26(12): 3278-3284.
doi:
10.3866/PKU.WHXB20101210
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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.
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Keywords:
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Catalytic activity
, - CuO/CeO2-ZrO2,
- CO oxidation,
- Microwave heating
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