六铝酸盐负载CuO催化还原NO性能

采用共沉淀法制备了LaAl12O19六铝酸盐载体,采用等体积浸渍法制备了不同负载量的CuO/LaAl12O19催化剂,并对其进行了XRD、H2-TPR和BET表征,考察了催化剂对CH4选择催化还原NO的性能.结果表明,CuO的负载并未改变六铝酸盐载体的结构,Cu在载体上以Cu2+的形式存在,活性组分CuO与载体LaAl12O19之间存在协同作用;CuO/LaAl12O19催化剂对CH4选择催化还原NO表现出良好活性,所制备的催化剂均能使NO的转化率达到99%;其中负载量为1.0 wt%的CuO/LaAl12O19催化剂的活性最好,完全反应温度T99%为560℃,且在80 h稳定性试验中表现出了良好的高温活性和热稳定性.

Catalytic reduction of NO over CuO/LaAl12O19 catalysts

LaAl12O19 hexaaluminate was prepared as the support by co-precipitation method.CuO was loaded on the support by using aqueous solution of copper nitrate as precursor and then the samples were calcinated to obtain the catalysts.The catalysts were characterized by means of XRD,H2-TPR and BET technique.And NO selective catalytic reduction activities were studied over the synthesized samples with the CH4 as reducer.The results showed that the structure of LaAl12O19 was unchanged after CuO loading and the active component existed as the Cu2+ state.There was synergistic reaction between the active component(CuO) and the support(LaAl12O19).The results also indicated that all the samples showed high catalytic activity,and the conversion of NO over all the catalysts reached 99%.The 1.0 wt% CuO/LaAl12O19 catalyst possessed the highest catalytic activity,over which the 99% NO conversion temperature was 560 ℃.It also showed thermal activity and stability during the 80 h stability test at 560 ℃.