CAJ | 학술논문

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/A12O3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.
채용활성측시화담기흡부、X사선연사、X사선광전자능보、자외.가견만반사흡수광보、고배투사전경、원위만반사부리협변환홍외광보화O2맥충흡부등연구료시첨가대Ag/Al2O3최화제저온안양화성능적영향.결과표명,괄량시적첨가가이명현촉진Ag/A12O3최화제적저온안양화활성,차대최화제적선택성영향불대.첨가시불부가이촉진Ag/Al2O3최화제표면흡부화활화O2적능력,이차가촉진최화제표면대안적해리흡부화활화.저시시촉진Ag/Al2O3최화제저온안양화활성적주요원인.
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 ℃, and slightly influenced N2 selectivity by improving the catalyst's ability to adsorb and activate O2 and the adsorption and activation of NH3.