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采用类凝胶法和超临界流体干燥技术制得了一组具有不同Co/Mo比的超细非负载型Mo Co K催化剂 ,考察了其合成低碳醇性能 ,并运用EXAFS技术对还原态催化剂的局域结构进行了研究。结果表明 ,还原态催化剂中Co以CoMoO4的形式存在 ,Co的配位数低于标样CoMoO4的配位数 ,且随着Co/Mo比的减小而减小。由于催化剂中Mo与Co之间的相互作用 ,使得Co O键长被不同程度地拉长。研究表明 ,催化剂中具有低配位Co且较弱的Mo、Co之间相互作用的类CoMoO4结构物相可以促进低碳醇的生成。
A series of ultrafine unsupported Mo Co K catalysts with different Co / Mo ratios were prepared by gel-like and supercritical fluid drying techniques. The properties of the synthesized low-carbon alcohol were investigated. The effect of the reduced-state catalyst Local structure has been studied. The results show that Co exists in the form of CoMoO4 in the reduced catalyst, the coordination number of Co is lower than that of the standard sample CoMoO4, and decreases with the decrease of Co / Mo ratio. Due to the interaction between Mo and Co in the catalyst, Co O bond length is elongated to some extent. It has been found that the CoMoO4-like phase of CoMoO4, which has a low Co coordinate and a weak interaction between Mo and Co, can promote the formation of lower alcohols.