负载型钴锰复合金属氧化物催化剂催化分解N_2O

以ZrO_2为载体,采用浸渍法制备负载型钴锰复合金属氧化物催化剂,研究催化剂活性组分负载量、Co与Mn物质的量比、焙烧条件及含H_2O气氛对N_2O转化率的影响。结果表明,催化剂最佳制备条件为:活性组分Co负载质量分数3%,Co与Mn物质的量比为1∶1,焙烧升温速率2℃·min-1,焙烧温度900℃。该条件制备的负载型钴锰复合金属氧化物催化剂在反应温度850℃时,N_2O转化率达98.7%。当反应气氛中H_2O体积分数小于20%条件下,850℃时N_2O转化率高于90%,表明催化剂具有较强的抗水性能。

Catalytic decomposition of N2O on supported Co-Mn complex oxide catalysts

Using ZrO₂ as the carrier,supported Co-Mn complex oxide catalysts were prepared by impregnation method.The influence of loading amounts of active components of the catalysts,n(Co)∶n(Mn),calcination condition and H₂O contents in reaction atmosphere on N₂O decomposition rates was studied.The experimental results showed that the optimal catalyst preparation condition was as follows:active component Co loading mass fraction 3%,n(Co)∶n(Mn)=1∶1,calcination heating rate 2 ℃·min^-1 and calcination temperature 900 ℃.The as-prepared catalyst possessed higher activity of N₂O decomposition,and N₂O decomposition rate reached 98.7% at reaction temperature 850 ℃.Under the condition of H₂O volume fraction less than 20% of reaction atmosphere and reaction temperature 850 ℃,N₂O decomposition rate was higher than 90%,which indicated that the catalyst had good performance of water-resistance.