纳米级TiO_2多元催化剂对NH_3选择性催化还原NO_X试验研究

Experiment Study on Multi-component Selective Catalysts Reaction of NOx over Nano-meter TiO_2 Particles

通过以纳米级锐钛型TiO2为载体制备多元V2O5-WO3(MoO3、CeO2)/TiO2脱氮催化剂,并进行脱氮性能对比,研究和讨论了反应温度、NH3/NO比以及不同助催化剂情况下对NO、NO2和N2O转化的影响。试验结果表明:MoO3较WO3、CeO2对NO、NO2的脱除效果更明显,但其生成的N2O也高于后者;不混合其它族系金属氧化物的CeO2催化剂低温效应不明显,但其对N2O选择性低;混合催化剂中当W/Mo=1/2时,能获得较好的催化效果。

An experimental research was carried on making selective catalysts of V2O5-WO3(MoO3?CeO2) over nano-meter anatase TiO2.The paper focus on how some operation parameters such as temperature,NH3/NO ration and catalytic component affect the conversion of NO,NO2and N2O.The result indicates that the effect of DeNOx in MO3-V2O5/TiO2 was more obvious than catalysts contain WO3 and CeO2,while its selectivity for N2O was higher.Compared with the experimental data,the effect of DeNOx of CeO2-V2O5/TiO2 was not obvious without mixing with other metal-oxides in lower temperature.As W/Mo mole equal to 1/2 in catalysts of WO3-MO3-V2O5/TiO2,better effect of DeNOx was obtained.