The promotional effect of Ce on CuFe/beta monolith catalyst for selective catalytic reduction of NOx by ammonia

Abstract The Cu 3 Fe 3 /beta and Cu 3 Fe 3 /Ce/beta catalysts were prepared by incipient wetness impregnation method, their activity, hydrothermal stability and C 3 H 6 resistance for selective catalytic reduction of NO x with ammonia (NH 3 -SCR) were investigated systematically. The experimental results indicated that Cu 3 Fe 3 /Ce/beta performed better NH 3 -SCR performance, because the dispersion of Fe and/or Cu species of Cu 3 Fe 3 /Ce/beta was higher than that of Cu 3 Fe 3 /beta. In addition, the hydrothermal stability of Cu 3 Fe 3 /beta was improved by the addition of Ce. The results of N 2 adsorption-desorption, XRD and NH 3 -TPD, showed that the change of the texture, structure and acid density of Cu 3 Fe 3 /Ce/beta was slighter than that of Cu 3 Fe 3 /beta after hydrothermal aging, the results of UV–vis DRS indicated that the aggregation of metal ions during hydrothermal aging process was inhibited by the introduction of Ce. Furthermore, compared to Cu 3 Fe 3 /beta, less amount of C 3 H 6 /O 2 was adsorbed on Cu 3 Fe 3 /Ce/beta, thus, the C 3 H 6 resistance of Cu 3 Fe 3 /Ce/beta was better than that of Cu 3 Fe 3 /beta. In conclusion, the catalytic activity, hydrothermal stability and C 3 H 6 resistance of Cu 3 Fe 3 /beta were improved by the addition of Ce.