Chinese Journal of Catalysis ›› 2017, Vol. 38 ›› Issue (8): 1423-1430.

• Articles • Previous Articles    

Support effect of the supported ceria-based catalysts during NH3-SCR reaction

Xiaojiang Yaoa,b,c, Li Chenc,d, Tingting Konga,c, Shimin Dinga, Qiong Luoc, Fumo Yanga,b,c,d   

  1. a Collaborative Innovation Center for Green Development in Wuling Mountain Areas, Yangtze Normal University, Chongqing 408100, China;
    b Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, Fujian, China;
    c Research Center for Atmospheric Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China;
    d School of Urban Construction and Environmental Engineering, Chongqing University, Chongqing 400045, China
  • Received:2017-05-15 Revised:2017-06-07 Online:2017-08-18 Published:2017-08-04
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21507130), the Chongqing Science and Technology Commission (cstc2016jcyjA0070, cstc2014pt-gc20002, cstc2014yykfC20003, cstckjcxljrc13), and the Open Project Program of Chongqing Key Laboratory of Catalysis and Functional Organic Molecules from Chongqing Technology and Business University (1456029).

Abstract:

To investigate how the physicochemical properties and NH3-selective catalytic reduction (NH3-SCR) performance of supported ceria-based catalysts are influenced as a function of support type, a series of CeO2/SiO2, CeO2/γ-Al2O3, CeO2/ZrO2, and CeO2/TiO2 catalysts were prepared. The physicochemical properties were probed by means of X-ray diffraction, Raman spectroscopy, Brunauer-Emmett-Teller surface area measurements, X-ray photoelectron spectroscopy, H2-temperature programmed reduction, and NH3-temperature programmed desorption. Furthermore, the supported ceria-based catalysts' catalytic performance and H2O + SO2 tolerance were evaluated by the NH3-SCR model reaction. The results indicate that out of the supported ceria-based catalysts studied, the CeO2/γ-Al2O3 catalyst exhibits the highest catalytic activity as a result of having a high relative Ce3+/Ce4+ ratio, optimum reduction behavior, and the largest total acid site concentration. Finally, the CeO2/γ-Al2O3 catalyst also presents excellent H2O + SO2 tolerance during the NH3-SCR process.

Key words: Support effect, Supported ceria-based catalyst, Reduction behavior, Surface acidity, Ammonia-selective catalytic reduction