摘要

以納米m-ZrO2為載體(ti),用浸(jin)漬(zi)法制備出MnOx-CeO2/m-ZrO2催(cui)化(hua)劑(ji)(ji),考(kao)察反應(ying)溫度、活性(xing)(xing)組分負載量對(dui)催(cui)化(hua)劑(ji)(ji)NH3-SCR脫硝(xiao)(xiao)活性(xing)(xing)影響,探討催(cui)化(hua)劑(ji)(ji)表(biao)(biao)面(mian)織(zhi)(zhi)構(gou)特征,分析催(cui)化(hua)劑(ji)(ji)脫硝(xiao)(xiao)活性(xing)(xing)機制.結(jie)果表(biao)(biao)明,在低溫脫硝(xiao)(xiao)溫度范圍,提高反應(ying)溫度、增(zeng)加(jia)活性(xing)(xing)組分負載量,有(you)(you)利于催(cui)化(hua)劑(ji)(ji)脫硝(xiao)(xiao)效率(lv)的(de)增(zeng)加(jia).110℃時,2.5%MnOx-CeO2/m-ZrO2脫硝(xiao)(xiao)效率(lv)為55.5%,15%MnOx-CeO2/m-ZrO2脫硝(xiao)(xiao)效率(lv)達93.5%.XRD、BET、XPS、H2-TPR表(biao)(biao)征結(jie)果表(biao)(biao)明,催(cui)化(hua)劑(ji)(ji)表(biao)(biao)面(mian)具有(you)(you)良好的(de)氧化(hua)還(huan)原(yuan)能力,表(biao)(biao)面(mian)織(zhi)(zhi)構(gou)對(dui)脫硝(xiao)(xiao)反應(ying)有(you)(you)利.NH3-TPD測試(shi)顯示,MnOx-CeO2/m-ZrO2催(cui)化(hua)劑(ji)(ji)的(de)脫硝(xiao)(xiao)反應(ying)機制為:NH3吸附在催(cui)化(hua)劑(ji)(ji)表(biao)(biao)面(mian)的(de)Lewis酸性(xing)(xing)位(wei)和(he)Brönsted酸性(xing)(xing)位(wei)上,通過反應(ying)生成相應(ying)中(zhong)間產物(wu)NH2NO或(huo)NH4NO2,中(zhong)間產物(wu)進一步分解(jie)最終(zhong)轉變為N2和(he)H2O;催(cui)化(hua)劑(ji)(ji)總脫硝(xiao)(xiao)反應(ying)效率(lv)中(zhong),在Lewis酸性(xing)(xing)位(wei)上的(de)脫硝(xiao)(xiao)反應(ying)占(zhan)比(bi)較大.

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