氮氧化物储存还原反应中还原时间的控制方法

Regeneration Period Control in NO_x Storage/Reduction Reaction

使用H_2作为还原剂,采用NO_x存储还原循环的试验方法,在石英反应器上研究了还原时间、反应温度和还原剂体积分数对NO_x存储还原(NSR)催化剂Pt/Ba/Ce/γ-Al_2O_3存储还原特性的影响.结果表明:存在一个最佳还原时间,在此处可取得最高的循环转化率;最佳还原时间与反应温度和还原剂体积分数相关,提高反应温度或者降低还原剂体积分数,最佳还原时间延长.

Comprehensive NOx storage/reduction （NSR） experiments were conducted in a quartz flow reac- tor to investigate the influence of regeneration period, temperature and volume fraction of reductant on NSR performance of Pt/Ba/Ce/γ-A12O3 when H2 was used as a reducing agent. It is found that the highest conversion ratio in the optimum regeneration time can be obtained, and it is dependent on the temperature and the volume fraction of the reducing agent. As the temperature increases, the optimum regeneration time increases. As the volume fraction of the reducing agent increases, the optimum regeneration time decreases.