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研究以纳米TiO2为载体,浸渍负载过渡金属氧化物,以CO为还原剂的脱硝催化剂的脱硝性能。实验中以计算量的Ni(NO3)2和Fe(NO3)3混合溶液浸渍纳米TiO2粉末,室温下搅拌30 min至混合均匀,放入旋转蒸发器中,70℃下至水分蒸干为止;所得粉末在550℃下、空气气氛中焙烧4 h即得所需催化剂。用以上方法分别制备2%Fe2O3-10%Cr2O3/TiO2、4%Fe2O3-8%Cr2O3/TiO2、6%Fe2O3-6%Cr2O3/TiO2、8%Fe2O3-4%Cr2O3/TiO2与10%Fe2O3-2%Cr2O3/TiO2等5种催化剂样品。实验结果表明,制备的催化剂具有较好的结构,分散较为均匀。对于CO+NO反应,Fe2O3-Cr2O3/TiO2系列催化剂具有较好的催化活性,NO的转化率都达到了100%。其中,10%Fe2O3-2%Cr2O3/TiO2样品具有最好的低温活性,H2-TPR结果表明,这是由于10%Fe2O3-2%Cr2O3/TiO2催化剂更易于被CO预还原。
The effect of denitration on denitrification catalysts loaded with transition metal oxide and CO as reductant was studied using nano-TiO2 as carrier. In the experiment, nano-TiO2 powder was impregnated with a mixed solution of Ni (NO3) 2 and Fe (NO3) 3 in a calculated amount, stirred at room temperature for 30 min to mix well, placed in a rotary evaporator and evaporated to dryness at 70 ° C. until The powder was calcined at 550 ° C for 4 h in air to obtain the desired catalyst. 2% Fe2O3-10% Cr2O3 / TiO2, 4% Fe2O3-8% Cr2O3 / TiO2, 6% Fe2O3-6% Cr2O3 / TiO2, 8% Fe2O3-4% Cr2O3 / TiO2 and 10% Fe2O3-2 % Cr2O3 / TiO2 five kinds of catalyst samples. The experimental results show that the prepared catalyst has better structure and more uniform dispersion. For the CO + NO reaction, the Fe2O3-Cr2O3 / TiO2 series catalyst has good catalytic activity, and the conversion of NO reaches 100%. Among them, 10% Fe2O3-2% Cr2O3 / TiO2 samples had the best low temperature activity. The results of H2-TPR showed that the 10% Fe2O3-2% Cr2O3 / TiO2 catalyst was easier to be pre-reduced by CO.