【摘要】 选用CO还原剂及负载不同比例In、Ag活性组分的CeO₂-γ-Al₂O₃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300⁴50℃温度区间内NO的转化率达到80%以上。研究了不同浓度CO、CO₂和H₂O对8%In-8%Ag/CeO₂-γ-Al₂O₃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H₂O、抗CO₂存在性能,在有H₂O和CO₂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/CeO₂-γ-Al₂O₃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In₂O₃与Ag₂O形式存在,且二者之间具有强相互作用而促使AgInO₂形成,从而使得8%In-8%Ag/CeO₂-γ-Al₂O₃催化剂具有高催化活性。更多还原

【Abstract】 Denitration experiment was conducted with CO reducing agent and CeO₂-γ-Al₂O₃ catalyst loaded with In and Ag active components of different proportion.The results show that the catalyst with 8%In-8% Ag has the highest catalytic activity,and the conversion rate of NO is over 80% at 300⁴50 ℃.The effects were studied of the concentration of CO,CO₂ and H₂O on 8% In-8%Ag/CeO₂-γ-A_l2O₃ catalytic activity.The results show that when volume ratio of CO to NO is equal to 1.5,NO removal rate is the highest,and the catalyst also has strong H₂O and CO₂ resistance with strong denitration activity in an environment containing H₂O and CO₂.BET experiment shows that 8%In-8%Ag/CeO₂-γ-Al₂O₃ catalyst has large specific surface area and pore volume.Data from XRD and XPS show that In and Ag exist mainly in the forms of In₂O₃ and Ag₂O in the catalyst,and they strongly interact to promote the formation of AgInO₂,resulting in the high catalytic activity of 8%In-8%Ag/CeO₂-γ-Al₂O₃.更多还原