负载型钴锰复合金属氧化物催化剂催化分解N_2O

Catalytic decomposition of N_2O on supported Co-Mn complex oxide catalysts

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。

Using ZrO2 as the carrier, supported Co - Mn complex oxide catalysts were prepared by impreg- nation method. The influence of loading amounts of active components of the catalysts, n （Co） ： n （ Mn ）, calcination condition and H20 contents in reaction atmosphere on N20 decomposition rates was studied. The experimental results showed that the optimal catalyst preparation condition was as follows：active com- ponent Co loading mass fraction 3% ,n（ Co）： n（Mn） = 1： 1, calcination heating rate 2 ℃ min-I and calcination temperature 900 ℃. The as - prepared catalyst possessed higher activity of N2O decomposi- tion, 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 decom- position rate was higher than 90% , which indicated that the catalyst had good performance of water - resistance.