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采用类凝胶法和超临界流体干燥技术制备了超细Mo -Co -K催化剂。通过BET、TEM、XRD和TPR等表征手段比较分析了不同制备参数尤其是Co/Mo比对超细Mo-Co -K催化剂性能的影响。结果表明 ,制得的催化剂为大比表面积、小粒径、大孔超细粒子。超细催化剂中Mo、Co、K之间具有较强的相互作用 ,形成了CoMoO4 和K2 Mo4 O13 物种。超细Mo基催化剂中加入Co和K均可降低催化剂的还原温度。合成低碳醇反应评价结果表明 ,超细Mo -Co-K催化剂具有很高的催化活性、选择性以及生成碳二以上醇的选择性。
Ultrafine Mo-Co-K catalyst was prepared by gel-like method and supercritical fluid drying technology. The effects of different preparation parameters, especially Co / Mo ratio, on the properties of the ultra-fine Mo-Co-K catalyst were analyzed by BET, TEM, XRD and TPR. The results show that the prepared catalyst is a large specific surface area, small particle size, macroporous ultrafine particles. The ultrafine catalyst Mo, Co, K has a strong interaction between the formation of CoMoO4 and K2 Mo4 O13 species. The addition of Co and K to the ultrafine Mo-based catalyst can reduce the reduction temperature of the catalyst. The results of the evaluation of the synthesis of lower alcohols show that the ultrafine Mo-Co-K catalyst has high catalytic activity, selectivity and selectivity for the production of alcohols above carbon dioxide.