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Effect of Mg Addition on the Physical and Catalytic Properties of Cu/CeO2 for NO + CO Reduction

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Abstract

Copper catalysts supported on magnesia promoted ceria are synthesized and used for NO reduction by CO. The supports and the subsequent Cu catalysts are prepared by citric acid sol–gel and impregnation methods, respectively. The results of N2-physisorption, XRD, EPR and TPR measurements indicate that the Mg addition promotes not only the dispersion of CuO, but also the formation of Cu–O–Ce solid solution. The highest amount of Cu–O–Ce solid solution is found in catalyst modified with 5 wt.% MgO. Based on the catalytic performance, two active sites for the reduction NO by CO are proposed: copper matrix and Cu–O–Ce solid solution. The former does not require the involvement of oxygen vacancy and is more active at low temperature range (T < 200 °C), while the latter shows higher NO conversion at temperature above 200 °C, due to the easy regeneration of oxygen vacancy. Also, it is found that the NO conversion over copper matrix is suppressed, while that over Cu–O–Ce solid solution is stimulated in high CO concentration.

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Acknowledgments

The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (20771025), the Nature Science Foundation of Fujian Province of China (2007J0221) and the Education Department of Fujian province of China (JB06050).

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Authors and Affiliations

  1. National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Gongye Road 523, Fuzhou, 350002, Fujian, China

    Jinfa Chen, Chongqi Chen, Yingying Zhan, Yanning Cao, Xingyi Lin & Qi Zheng

  2. Laboratory of Catalysis and Materials Department of Chemical Engineering Faculty of Engineering, University of Porto, 4200-465, Porto, Portugal

    Junjiang Zhu

Authors
  1. Jinfa Chen
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  2. Junjiang Zhu
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  3. Chongqi Chen
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  7. Qi Zheng
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Correspondence to Qi Zheng.

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Chen, J., Zhu, J., Chen, C. et al. Effect of Mg Addition on the Physical and Catalytic Properties of Cu/CeO2 for NO + CO Reduction. Catal Lett 130, 254–260 (2009). https://doi.org/10.1007/s10562-009-9878-1

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  • DOI: https://doi.org/10.1007/s10562-009-9878-1

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