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

摘要

The Cu3Fe3/beta and Cu3Fe3/Ce/beta catalysts were prepared by incipient wetness impregnation method, their activity, hydrothermal stability and C3H6 resistance for selective catalytic reduction of NOx with ammonia (NH3-SCR) were investigated systematically. The experimental results indicated that Cu3Fe3/Ce/beta performed better NH3-SCR performance, because the dispersion of Fe and/or Cu species of Cu3Fe3/Ce/beta was higher than that of Cu3Fe3/beta. In addition, the hydrothermal stability of Cu3Fe3/beta was improved by the addition of Ce. The results of N-2 adsorption-desorption, XRD and NH3-TPD, showed that the change of the texture, structure and acid density of Cu3Fe3/Ce/beta was slighter than that of Cu3Fe3/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 Cu3Fe3/beta, less amount of C3H6/O-2 was adsorbed on Cu3Fe3/Ce/beta, thus, the C3H6 resistance of Cu3Fe3/Ce/beta was better than that of Cu3Fe3/beta. In conclusion, the catalytic activity, hydrothermal stability and C3H6 resistance of Cu3Fe3/beta were improved by the addition of Ce. (C) 2016 Elsevier B.V. All rights reserved.