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.
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.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
2011年第5期727-735,共9页
基金
国家重点基础研究发展计划(973计划,2010CB732304)
国家高技术研究发展计划(863计划2009AA064802)
国家自然科学基金委员会创新研究群体科学基金(50921064)~~
关键词
氨
银
铈
氧化铝
负载型催化剂
氧气吸附
高倍透射电镜
原位漫反射傅里叶变换红外光谱
ammonia
silver
cerium
alumina oxide
supported catalyst
oxygen uptake
high resolution transmission electron microscopy
in situ diffuse reflectance infrared Fourier transform spectroscopy
