用表面反应改性法制备了ＭｏＯ３ＳｉＯ２表面复合物，用等体积浸渍法制备了ＭｏＯ３ＳｉＯ２担载ＣｕＰｄ金属催化剂．用ＩＲ和ＴＰＤ研究了ＣＯ２在其上的吸附，考察了ＣＯ２吸附产生ＣＯ和Ｏ的ＴＰＤＭＳ结果，讨论了ＣＯ２在ＣｕＰｄ／ＭｏＯ３ＳｉＯ２上的表面反应机理．结果表明：ＣＯ２在催化剂上具有良好的化学吸附性能，形成线式吸附态、剪式吸附态和卧式吸附态；ＣＯ２卧式吸附态具有良好的表面反应活性，一定温度下可解离为吸附的ＣＯ和Ｏ，这种新生态Ｏ有良好的选择氧化性能． MoO3  SiO2 surface composites were prepared by the surface reaction modification method and the Mo3SiO2 supported CuPd metal catalysts were prepared by the same volume impregnation method. The adsorption of CO2 on it was investigated by IR and TPD. The TPDMS results of CO and O adsorption by CO2 adsorption were investigated. The surface reaction mechanism of CO2 on CuPd / MoO3SiO2 was discussed. The results show that CO2 has good chemisorption performance on the catalyst, forming linear adsorption state, scission adsorption state and horizontal adsorption state. The CO2 horizontal adsorption state has a good surface reactivity and can be dissociated to a certain temperature The CO and O, this new ecosystem O has a good choice of oxidation properties.