Low-Temperature NH3-SCR on Cex-Mn-Tiy Mixed Oxide Catalysts: Improved Performance by the Mutual Effect between Ce and Ti

A series of Cex-Mn-Tiy catalysts were synthesized using the coprecipitation method, and sodium carbonate solution was used as a precipitant. The various assessed by selective catalytic reduction NOx with NH3, characterized X-ray diffraction, Raman spectroscopy, H2 temperature-programmed reduction, NH3 desorption, photoelectron spectroscopy to investigate physicochemical properties, surface acidity, redox abilities catalysts. Ce0.1-Mn-Ti0.1 catalyst exhibited best performance (more than 90% conversion in range 75 225 °C), result proper ability, abundant acid sites, high content Mn4+ Ce3+, surface-adsorbed oxygen (OS). results situ DRIFT showed that NH3-SCR reaction followed both E-R L-H paths over catalyst, it occurred faster more sharply when mainly abided mechanism.