Chinese Journal of Catalysis ›› 2016, Vol. 37 ›› Issue (8): 1369-1380.DOI: 10.1016/S1872-2067(15)61098-1

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Preparation, characterization, and catalytic performance of high efficient CeO2-MnOx-Al2O3 catalysts for NO elimination

Xiaojiang Yaoa, Lulu Lib,c, Weixin Zoub,c, Shuohan Yub,c, Jibin And, Hongli Lia, Fumo Yanga, Lin Dongb,c   

  1. a. Key Laboratory of Reservoir Aquatic Environment of CAS, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China;
    b. Key Laboratory of Mesoscopic Chemistry of MOE, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, Jiangsu, China;
    c. Jiangsu Key Laboratory of Vehicle Emissions Control, Center of Modern Analysis, Nanjing University, Nanjing 210093, Jiangsu, China;
    d. Chongqing Key Laboratory of Environmental Materials and Remediation Technology, Chongqing University of Arts and Sciences, Chongqing 402160, China
  • Received:2016-02-16 Revised:2016-03-20 Online:2016-07-29 Published:2016-08-01
  • Contact: Xiaojiang Yao, Fumo Yang, Lin Dong
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21507130), the Open Project Program of Chongqing Key Laboratory of Environmental Materials and Remediation Technology from Chongqing University of Arts and Sciences (CEK1405), the Open Project Program of Beijing National Laboratory for Molecular Sciences (20140142), the Open Project Program of Jiangsu Key Laboratory of Vehicle Emissions Control (OVEC001), the Open Project Program of Chongqing Key Laboratory of Catalysis and Functional Organic Molecules from Chongqing Technology and Business University (1456029), and the Chongqing Science & Technology Commission (cstc2014pt-gc20002).

Abstract:

A series of CeO2-MnOx-Al2O3 mixed oxide catalysts (Ce:Mn:Al mole ratio = 6:4:x, x = 0.25, 0.5, 1, 2) were prepared by a simple one-step inverse co-precipitation method to investigate the influence of the incorporation of Al3+ into CeO2-MnOx mixed oxides. CeO2-MnOx, CeO2-Al2O3, and MnOx-Al2O3 mixed oxides, and CeO2 were prepared by the same method for comparison. The samples were characterized by XRD, Raman, N2 physisorption, H2-TPR, XPS, and in situ DRIFTS. The catalytic reduction of NO by CO was chosen as a model reaction to evaluate the catalytic performance. The incorporation of a small amount of Al3+ into CeO2-MnOx mixed oxides resulted in a decrease of crystallite size, with the increase of the BET specific surface area and pore volume, as well as the increase of Ce3+ and Mn4+. The former benefits good contact between catalyst and reactants, and the latter promotes the adsorption of CO and the desorption, conversion and dissociation of adsorbed NO. All these enhanced the catalytic performance for the NO+CO model reaction. A reaction mechanism was proposed to explain the excellent catalytic performance of CeO2-MnOx-Al2O3 catalysts for NO reduction by CO.

Key words: Ceria-based mixed oxide, Incorporation, Electron interaction, Adsorption property, NO elimination