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催化学报  2014 

非晶Ce-Ti氧化物用于NH3选择性催化还原NO的原位红外研究

DOI: 10.1016/S1872-2067(14)60154-6, PP. 1289-1298

Keywords: 选择性催化还原,一氧化氮,氨气,非晶Ce-Ti氧化物,原位红外,机理

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Abstract:

?采用原位红外光谱研究了在具有短程有序Ce-O-Ti结构的非晶Ce-Ti氧化物上NH3选择性催化还原(SCR)NOx反应.在反应条件下,催化剂表面主要被NH3吸附物种覆盖,而检测不到NOx吸附物种.经测定,NO的反应级数为0.5-0.6,表明Langmuir-Hinshelwood机理和Eley-Rideal机理同时存在.可能的机理是NH3吸附物种和弱吸附的NOx反应,生成NHyNO3(y=0-4)活性中间物种,并通过GAUSSIAN计算和原位红外结果证实了它们的存在.Ce-O-Ti结构中Ce与Ti之间表现出原子尺度的相互作用,所以在SCR反应的活性温度窗口下,催化剂的氧化还原活性提高.

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