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选用CO还原剂及负载不同比例In、Ag活性组分的CeO_2-γ-Al_2O_3催化剂进行脱硝实验,发现8%In-8%Ag具有较高的催化活性,在300~450℃温度区间内NO的转化率达到80%以上。研究了不同浓度CO、CO_2和H_2O对8%In-8%Ag/CeO_2-γ-Al_2O_3催化剂的影响,结果显示CO与NO体积比为1.5时,NO脱除率最高,且该催化剂具有较强的抗H_2O、抗CO_2存在性能,在有H_2O和CO_2的环境下催化剂仍有较强的脱硝活性。BET实验研究结果表明,8%In-8%Ag/CeO_2-γ-Al_2O_3催化剂具有较高的比表面积和较大的孔容,XRD和XPS分析揭示了In、Ag主要以In_2O_3与Ag_2O形式存在,且二者之间具有强相互作用而促使AgInO_2形成,从而使得8%In-8%Ag/CeO_2-γ-Al_2O_3催化剂具有高催化活性。
The results show that 8% In-8% Ag has a high catalytic activity for the removal of NO from CeO_2-γ-Al_2O_3 catalysts loaded with different concentrations of In and Ag active components. Conversion rate of more than 80%. The effects of different concentrations of CO, CO_2 and H_2O on 8% In-8% Ag / CeO_2-γ-Al_2O_3 catalysts were studied. The results showed that the removal rate of NO was the highest when the volume ratio of CO to NO was 1.5, Anti-H_2O and anti-CO_2. In the presence of H_2O and CO_2, the catalyst still has strong denitrification activity. The BET experimental results show that the 8% In-8% Ag / CeO_2-γ-Al_2O_3 catalyst has high specific surface area and large pore volume. XRD and XPS analysis reveal that In and Ag exist mainly in the form of In 2 O 3 and Ag 2 O, And the strong interaction between them led to the formation of AgInO 2, which made the 8% In-8% Ag / CeO 2 -γ-Al 2 O 3 catalyst have high catalytic activity.