Abstract
A series of phosphorus-doped CeO2/TiO2 catalysts were prepared by impregnation method and the effects of P on NH3-SCR performance over CeO2/TiO2 were investigated. The P-doped catalysts showed much better deNOx performance than Ce10/Ti catalyst. It was found that the optimal phosphorus loading was 3 wt.% (calculated as P2O5). The Ce10P3/Ti catalyst also exhibited excellent resistance to H2O. The samples were characterized by BET, XRD, XPS, NH3-TPD, H2-TPR and in-situ DRIFT studies. It was found that the ratio of surface Ce3+ and surface adsorbed oxygen species were promoted by phosphorus doping, thus the transfer of surface oxygen and the regeneration of active sites could be accelerated accordingly. Moreover, it was confirmed that the amorphous CePO4 appeared with excellent redox property after the doping of phosphorus. The amorphous CePO4 species could promote NH3-SCR activity by activating NH4+ species on the Brønsted acid sites of phosphate radical, forming NH2 intermediates to react with gaseous NO via an Eley–Rideal mechanism.
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