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OALib Journal期刊
ISSN: 2333-9721
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酸性金属氧化物对锰铈氧化物催化剂脱硝温度窗口的调控作用
DOI: 10.1016/S1872-2067(14)60106-6, PP. 1281-1288
Keywords: 选择性催化还原,锰铈复合氧化物,酸性金属氧化物,温度窗口,氧化还原位,酸性位
Abstract:
？利用溶胶-凝胶法，采用三种酸性金属氧化物（氧化铌、氧化钨和氧化钼）对锰铈复合氧化物催化剂进行了改性.测试了催化剂的氮氧化物选择性催化还原（SCR）活性，以筛选对应不同温度窗口的合适酸性氧化物改性剂.同时评价了催化剂的NO氧化和NH3氧化活性.利用X射线衍射、BET比表面积测试、H2程序升温还原、NH3/NOx程序升温脱附和NH3/NOx吸附红外光谱等手段对催化剂进行了表征.MnOx-CeO2催化剂表现出良好的低温（100-150℃）活性.酸性金属氧化物的添加削弱了催化剂的氧化还原特性，从而抑制了NH3的活化和NO2辅助的快速SCR反应.与此同时，相对高温（250-350℃）区NH3的氧化也受到了抑制，B酸和L酸上的NH3吸附得以增强.因此，催化剂的SCR脱硝温度窗口向高温移动，改性效果Nb2O5
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