采用XPS技术对氧化态及还原态超细Mo Co K催化剂进行了研究 .结果表明 ,在氧化态超细Mo Co K催化剂中 ,钼和钴分别以Mo6 +和Co2 +物种存在 ,催化剂中各物种之间存在着相互作用 ;随着Co/Mo比的增大 ,还原态催化剂中Mo4+物种的含量逐渐增大并出现极大值 ;催化剂上合成低碳醇反应性能与其表面的Mo4+物种有关 .将催化剂表面的Mo4+物种含量与其合成低碳醇选择性进行关联 ,发现二者存在着很好的对应关系 .此外 ,对超细Mo Co K催化剂上合成低碳醇反应的活性中心进行了初步探讨 XPS was used to study the oxidation state and the reduction of ultrafine Mo Co K catalyst.The results show that molybdenum and cobalt exist as Mo6 + and Co2 + species respectively in the ultrafine Mo Co K catalyst, and the species of catalyst With the increase of Co / Mo ratio, the content of Mo4 + species in the reduced catalyst gradually increases and reaches a maximum value; the reaction performance of the catalyst on the synthesis of lower alcohols is related to the surface Mo4 + species. The content of Mo4 + species on the surface of the catalyst was correlated with the selectivity of the synthesized lower alcohols, and found that there was a good correspondence between them.In addition, the active centers for the synthesis of lower alcohol alcohols over the ultrafine Mo Co K catalyst were discussed