Denitrification performance of Cu and Ce doped hexaaluminate catalysts
铜铈掺杂六铝酸盐的脱硝性能

Hexaaluminate catalysts LaMxAl12-xO19 (M=Cu, Ce, CuCe) for NO removal were prepared by the co-precipitation method. The catalysts were characterized by the means of XRD, H2-TPR and BET. The catalyst efficiency for selective catalytic reduction of NO by CO was evaluated in a catalytic microreactor. The results show that Cu ions can easily enter the hexaaluminate crystal lattice to form a good hexaaluminate phase. Ce ions are hard to enter hexaaluminate skeleton, exist mainly in the form of CeO2. Under the condition of CO+NO, all of the three catalysts have a good denitrification activity. Due to the synergistic effect between Cu ions and Ce ions, catalyst LaCuCeAl10O19 has a better denitrification activity. With the introduction of SO2, the denitrification activities of all the three catalysts decline to different levels. Catalyst LaCuAl11O19 is poisoned by SO2 most seriously, while catalyst LaCuCeAl10O19 has the best denitrification activity among them.