Acta Phys. -Chim. Sin. ›› 2013, Vol. 29 ›› Issue (06): 1289-1296.doi: 10.3866/PKU.WHXB201304162

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Effects of Preparation Methods on the Catalytic Performance of Selective Catalytic Reduction of NO with CH4 over Co-MOR Catalysts

LI Bin1,2, WANG Hong1, DING Fu-Chen1, LI Cui-Qing1, SONG Yong-Ji1, KE Ming2, REN Cui-Tao1   

  1. 1 Beijing Institute of Petrochemical Technology, Beijing 102617, P.R.China;
    2 China University of Petroleum, Beijing 102249, P. R. China
  • Received:2013-02-18 Revised:2013-04-15 Published:2013-05-17
  • Supported by:

    The project was supported by the Science and Technology Development of Bejing Education Committee, China (KM200910017002) and Academic Human Resources Development in Institutions of Higher Learning under the Jurisdiction of Beijing Municipality, China (PHR200907129, PHR20110517).

Abstract:

A series of Co-mordenite (MOR) catalysts prepared by ion-exchange or impregnation methods were used in the selective catalytic reaction of NO with methane (CH4-SCR). The structure and physicochemical properties of the catalysts were examined by X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM), UV-Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and temperature-programmed desorption of NO (NO-TPD). The Co species in the catalyst prepared by impregnation is present as Co3O4, whereas in the catalyst prepared by an ion-exchange method, the Co species enter in the mordenite skeleton with the ion form, and the more Co2+ and [Co-O-Co]2+ formed in the catalysts, the more uniform the adsorption of NO centers and the active centers of CH4-SCR. The catalysts prepared by different methods exhibited different activities for CH4-SCR. The catalysts prepared by ion-exchange exhibited activity over a wide activity temperature region, and NO conversion was over 50% at 327-450℃ on the Co(0.30)-MOR catalyst.

Key words: Co, Mordenite, Ion-exchange, CH4, NO

MSC2000: 

  • O643