【摘要】 利用程序升温反应(TPR)技术,对同时催化去除柴油机炭黑和氮氧化物反应进行了研究.结果表明稀土金属氧化物及其负载金属氧化物能在富氧条件下使炭黑(C)和氮氧化物(NOx)互为氧化还原,主要生成CO2和N2,达到C-NOx两者的同时催化去除.在Nd2O3等稀土氧化物上负载K和Mn等金属氧化物能降低炭黑的起燃温度,提高NO的还原转化率,其中K/Mn/Nd2O3上的催化反应同无催化反应相比,其炭黑起燃温度降低了170℃,最大NO→N2转化率达到75.4%.K能显著降低起燃温度,并存在最佳负载量(2mmol.g-1).K负载量过多,可能导致稀土金属氧化物上原有活性位的覆没.更多还原

【Abstract】 Simultaneous catalytic removal of soot particulate and NO_x in the presence of excess oxygen was investigated over Nd₂O₃-based metal oxides by using temperature programmed reaction （TPR）.The catalytic performance depended significantly on loaded metal oxides, in which the catalyst containing potassium oxide-and manganese oxide-supported neodymium oxide（K/Mn/Nd₂O₃） was the best catalyst in the study. As a result, the ignition temperature of soot was reduced from 500℃ to 330℃, and the conversion efficiency of NO x to N₂ was increased to 75.4%. Potassium oxide promoted obviously the catalytic activities, especially in decreasing the ignition temperature of soot. The amount of potassium oxide had an optimum [2 mmol·（g rare earth oxide） -1 ], and too much loading of potassium oxide might cause the covering of active sites of the rare earth oxide.更多还原