Chinese Journal of Catalysis ›› 2016, Vol. 37 ›› Issue (2): 300-307.DOI: 10.1016/S1872-2067(15)60977-9

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Promotional effect of H3PO4 on ceria catalyst for selective catalytic reduction of NO by NH3

Ting Yia, Yibo Zhanga,b, Jingwei Lia, Xiangguang Yanga,b   

  1. a State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China;
    b Laboratory of Green Chemistry and Process, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China
  • Received:2015-07-24 Revised:2015-09-24 Online:2016-01-30 Published:2016-01-31
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21177120), and the Open Fund of Key Laboratory of Functional Inorganic Material Chemistry (Heilongjiang University), Ministry of Education.

Abstract:

A series of H3PO4-modified CeO2 samples were prepared by impregnation of CeO2 with H3PO4 solution, and evaluated for the selective catalytic reduction of NOx by NH3. The samples were characterized by X-ray diffraction, N2 adsorption-desorption, infrared spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, temperature-programmed desorption of NH3, and temperature-programmed reduction of H2. The results showed that more than 80% NO conversion was achieved in the temperature range 250-550℃ over the H3PO4-CeO2 catalyst. The enhanced catalytic performance could be ascribed to the increase in acidic strength, especially Brönsted acidity, and reduction in redox properties of the CeO2 after H3PO4 modification.

Key words: Ammonia, Selective catalytic reduction, Ceria, Phosphoric acid, Redox, Acidity