主要讨论在不同反应温度和不同水蒸汽浓度下,新型的NOx储存-还原催化剂12CaO·7Al2O3／10％K(简称C12A7／K)中水的存在对NO还原性能的影响．研究结果表明,当存在1．2％水蒸汽,并低于500℃时,NO转化率和N2的选择性均降低,水蒸汽的存在对催化剂低温区的活性起到较明显的抑制作用;而温度高于500℃时,此抑制作用则基本消失,说明此时C12A7／K催化剂的水热稳定性较好．FT-IR结果证明储存NOx后的C12A7／K样品小形成了NO3／NO2的反应中间物种,用H2还原则可消除中间物种,以N2等形式放出。 The effect of water on NO reduction performance of NO x storage-reduction catalyst 12CaO · 7Al 2 O 3/10% K (C12A7 / K) under different reaction temperatures and different water vapor concentrations was mainly discussed. The results show that when there is 1.2% water vapor and less than 500 ℃, the NO conversion and N2 selectivity decrease. The presence of water vapor can significantly inhibit the activity of the catalyst in the low temperature region. When the temperature is higher than 500 ℃, the inhibition basically disappears, indicating that the hydrothermal stability of C12A7 / K catalyst is better at this time. The result of FT-IR shows that the sample of C12A7 / K after the storage of NOx forms small reaction intermediate of NO3 / NO2, and H2 can eliminate the intermediate species and release as N2.