LaMO_3(M=Fe,Co,Ni)氧吸附性能与CO氧化催化活性

THE ABILITY OF ADSORBING O 2 AND CO OXIDATIVE ACTIVITY OF LaMO 3(M=Fe,Co,Ni)

以ＸＰＳ表征了ＬａＭＯ３（Ｍ＝Ｆｅ，Ｃｏ，Ｎｉ）晶体表面氧的性质，区分了ＸＰＳ谱中二种Ｏ１ｓ峰．由Ｏ吸峰的相对强度获得了ＬａＭＯ３表面吸附Ｏ２性能的变化规律，并得到了Ｏ２吸附量（脉冲法）实验结果的映证．ＣＯ氧化反应活性测定发现：３００℃下，ＬａＭＯ３活性顺序为ＬａＣｏＯ３＞ＬａＮｉＯ３＞ＬａＦｅＯ３，与其Ｏ２吸附量大小顺序相一致．

The surface oxygen of LaMO 3(M=Fe,Co,Ni) crystallites are characterized by X ray photoelectron spectroscopy(XPS). It was shown by XPS patterns,that two O 1s peaks were distingwished,one is crystal O 1s and another is adsorbing O 1s . The ability of the adsorbing O 2 was compared according to the relative strongth of O 吸 peak in the pattern,and proved by the experimental results of O 2 adsorbed.It was found that the activity order for catalysing CO oxidation is LaCoO 3>LaNiO 3>LaFeO 3,which corresponds to that of their amount of O 2 adsorbed.