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γFe2O3的选择性催化还原脱硝性能及其对NH3和NO的表面吸附行为研究

DOI: 10.13334/j.0258-8013.pcsee.2014.32.006, PP. 5734-5740

Keywords: γFe2O3催化剂,选择性催化还原(SCR),脱硝,原位红外漫反射光谱,吸附

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Abstract:

采用γFe2O3纳米粉末制备选择性催化还原(selectivecatalysisreduction,SCR)脱硝催化剂,通过XRD、BET对催化剂进行表征,并对此催化剂的低温SCR脱硝性能在一固定床反应器中进行考察;此外通过原位红外漫反射光谱法(diffusereflectanceinfraredFouriertransformspectroscopy,DRIFTS)研究了反应物在催化剂表面的吸附活化。结果表明,实验所采用的Fe2O3为纯γ相,具有较高的热稳定性和脱硝效率。DRIFTS实验研究表明,NH3主要吸附到γFe2O3催化剂表面L酸位形成吸附态的NH3,在小于270℃时有部分NH3吸附到B酸位生成NH4+;O2的存在能促进吸附到L酸位上的NH3发生脱氢反应生成NH2,并能够大大促进NO在催化剂表面吸附生成硝酸盐和吸附态的NO2,从而促进低温下的SCR反应。在90~360℃的温度区间内可能遵循两种反应途径,主要反应是吸附在L酸位的NH3脱氢生成NH2,然后和气态的NO反应生成N2和H2O;在低于240℃时,可能存在另外一种反应途径,中间产物NO2(NH4+)2与NO反应生成N2、H2O和H+。

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