Characterization of CeO2-WO3/TiO2 Catalysts Prepared by Adding PEO for Selective Catalytic Reduction of NOx with NH3

A series of the CeO2-WO3/TiO2 catalysts doping polyethylene oxide (PEO) were synthesized by coprecipitation method and applied to selective catalytic reduction of NOx with NH3. The PEO doping catalysts showed better low-temperature activity, which demonstrated a prominent wide operation window ranging from 220 to 526 degrees C. A series of characterization methods were performed to demonstrate the influence of PEO addition on the internal structure, physical and chemical properties and catalytic reaction mechanism for the CeO2-WO3/TiO(2 )catalysts. More importantly, the addition of PEO could significantly modify and optimize the pore structure of catalysts, meanwhile, it was verified that the addition of PEO can enhance the content of Ce3+, adsorbed oxygen and the Bronsted and Lewis acid sites on the catalyst surface, thereby affecting the redox abilities, nitrogen oxides and ammonia adsorption capacity of catalysts. [GRAPHICS] .