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中文摘要：
采用活性测试和氮气吸附、X射线衍射、X射线光电子能谱、紫外-可见漫反射吸收光谱、高倍透射电镜、原位漫反射傅里叶变换红外光谱和O2脉冲吸附等研究了铈添加对Ag/Al2O3催化剂低温氨氧化性能的影响.结果表明,适量铈的添加可以明显促进Ag/Al2O3催化剂的低温氨氧化活性,且对催化剂的选择性影响不大.添加铈不仅可以促进Ag/Al2O3催化剂表面吸附和活化O2的能力,而且可促进催化剂表面对氨的解离吸附和活化.这是铈促进Ag/Al2O3催化剂低温氨氧化活性的主要原因.
英文摘要：
The effects of adding CeO2 to Ag/Al2O3 on the selective catalytic oxidation of ammonia to nitrogen were investigated by activity test and N2 physisorption,X-ray diffraction,X-ray photoelectron spectroscopy,UV-Vis diffuse-reflectance spectroscopy,high resolution transmission electron microscopy,in situ diffuse reflectance infrared Fourier transform spectroscopy of NH3 adsorption,and O2-pulse adsorption.Adding a suitable amount of CeO2 improved the catalytic activity of Ag/Al2O3 for NH3 oxidation at temperatures below 160 o C,and slightly influenced N2 selectivity by improving the catalyst’s ability to adsorb and activate O2 and the adsorption and activation of NH3.
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