Abstract
By annealing the self-assembled Mn3[Co(CN)6]2·nH2O@Ti(OH)4, MnCoOx@TiO2 double-walled nanocage catalysts were obtained. Excellent low-temperature NH3-SCR performance (above 90 % NO conversion efficiency at 200–325 °C), acceptable stability, and exceptional SO2 resistance were demonstrated. According to a series of characterizations, the MnCoOx@TiO2 catalysts were found to have an enlarged specific surface area, improved surface acidity and redox ability, enhanced dispersion of active components, and abundantly formed adsorbed oxygen (Oads) species, which consequently exhibited the improved deNOx performance. Meanwhile, the coating of the TiO2 shell reduced the basic sites to adsorb SO2, hence leaving a certain proportion of active metal oxides preserved. Apparently, the MnCoOx@TiO2 catalysts were observed to have an enhanced SO2-resistant ability.
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