用uPS和XPS等表面分析方法，研究了CH＿3OH、CO和CO＿2等小分子在Pd（1111）单晶及其预氧化表面的吸附性质。室温下，CH＿3OH在清洁的Pd（111）表面以CH＿3O￣-的形态被吸附，部分分解为CH＿2；CO在Pd（111）表面首先以分子形式被吸附，尔后部分解离成C￣（8-）；CO＿2在Pd（111）表面分解C￣（8-）.CO＿（2b）和C-O键的活化与Pd表面的电子密度有关，氧化使Pd表面断裂C-O键的活性降低，而断裂O-H和C-H键的活性仍然存在。The interactions of CH_3OH,CO,CO_2 on clean and preoxidised Pd(111)sur-Faces were studied by both UPS and XPS,At room-temperature,CH_3 OH adsorption on clean Pd(111) surFace was Found to methoxy,CH_3O(ad)species,subsequently, C-O bond was activated toform adsorbed methyl, CH_x.Only C(ad)and CO(ad)species were observed when CO adsorbed on theclean Pd(111) surFace, but C(ad),CO(ad) and speciesl were observed when CO_2 adsorbed onthe clean Pd(111) surFace.On preoxidised Pd(111)surFace, methanol adsorbed as CH_3O(ad) andCHx (ad ),CO adsorbed only as CO(ad ).There were not any activation that CO_2 on preoxidised Pd(111)surFace.It were Found that the activation of C-H and C-O bonds depended on surFace electronintensity.On preoxidised surFaces the activation of C-O bonds decreased , but the activation of O-Hand C-H bonds still existed
