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采用自蔓延燃烧法制备了Ti0.9Mn0.05Fe0.05O2-δ催化剂,运用原位漫反射傅里叶变换红外光谱对该催化剂的NO和NH3稳态吸附以及NO和NH3瞬态反应进行了详细地分析与讨论.结果表明,相比于Lewis酸性位,150 oC时Brnsted酸性位吸附的NH3更具有SCR活性;与双齿硝酸盐和桥式硝酸盐相比,NO吸附产生的单齿硝酸盐是主要的中间物种;该SCR反应遵循Eley-Rideal和Langmuir-Hinshelwood机理,但以后者为主.另外,O2的存在有利于NO的氧化和配位态NH3的活化.
The Ti0.9Mn0.05Fe0.05O2-δ catalyst was prepared by the self-propagating combustion method. The steady-state adsorption of NO and NH3 and the transient reaction of NO and NH3 were investigated by in situ diffuse reflectance Fourier transform infrared spectroscopy Analysis and discussion.The results show that compared with the Lewis acidic sites, NH3 adsorbed by Brnsted acidic sites at 150 oC has more SCR activity than monozotized nitric acid and bridged nitrates Salt is the main intermediate species and the SCR reaction follows the Eley-Rideal and Langmuir-Hinshelwood mechanisms, but the latter is dominant. In addition, the presence of O2 favors the oxidation of NO and the activation of the coordinated NH3.