Synergetic catalysis of ceria and titania for selective reduction of NO

The promotional effect of the interaction between titania and ceria on the catalytic performance for selective reduction of NO was studied. The catalysts, CeO2, TiO2, CeO2/TiO2 and TixCe1-xO2, were synthesized and tested in NH3-Selective catalytic reduction (SCR) of NO, and the samples were characterized by the Brunaller, Emmett and Teller (BET absorbed gas N-2), X-ray diffraction (XRD), high resolution transmission electron microscopy (HR-TEM), and temperature programmed desorption (TPD NH3) techniques. The improvement mechanism of the interaction between the titania and ceria had been explored and discussed from two aspects of micro-structure and surface acidity. The interaction between the titania and ceria greatly improved the catalytic activity but had little effect on the active temperature. It was first reported that the acid amount determined the catalytic activity and the acid strength determined the active temperature for NH3-SCR of NO.