Powder Characteristics and Catalytic Activity of CeCVTiCh Catalysts Prepared by the Sol-gel Method for SCR of NOX

摘要

nano powders for the low-temperature selective catalytic reduction (SCR) of NO_X prepared by the sol-gel method were characterized by structural, morphological, and physico-chemical techniques. The catalysts based on 10 wt%-CeO2/TiO2 were synthesized using a sol-gel method and their characteristics were compared with the catalyst prepared by the impregnation method. The XRD peaks of all the samples were assigned to a TiO_2 phase (anatase). The sample synthesized by the sol-gel method had a very fine particle size and a higher specific surface area than the CeOa/TiCb catalyst prepared by the impregnation method, 123.4 m2/g and 47.9 m2/g, respectively. The CeO_2/TiO_2 catalyst made by sol-gel method had stronger catalytic acid sites according to Fourier transform infrared spectroscopy, showing NOx conversion of 80% at 250 °C and 98% at 300 °C. The CeO_2/TiO_2 catalyst prepared by the sol-gel method showed excellent SCR activities and resistance to SO_2, even with a relatively small ceria (CeO_2) content.