以超细ＳｉＯ２为载体，用ＫＢＨ４还原Ｃｕ２＋盐溶液制备了非负载型Ｃｕ和负载型Ｃｕ／ＳｉＯ２催化剂．ＸＲＤ，ＴＥＭ和电子衍射分析结果表明，负载型Ｃｕ／ＳｉＯ２为完全非晶态，而非负载型Ｃｕ中存在着少量晶态Ｃｕ．ＤＳＣ结果表明，非晶态Ｃｕ／ＳｉＯ２的热稳定性明显高于非负载型Ｃｕ，说明超细ＳｉＯ２具有稳定非晶结构的作用．ＸＰＳ结果表明，还原产物中的铜原子呈Ｃｕ０状态．ＩＣＰ分析结果表明，样品中的Ｂ含量均低于０１％，只得到超细ＳｉＯ２负载的单质非晶态Ｃｕ．甲酸甲酯氢解反应结果表明，非晶态Ｃｕ几乎无活性，非晶态Ｃｕ／ＳｉＯ２在８０℃即表现出较高的活性． The unsupported Cu and supported Cu / SiO2 catalysts were prepared by the reduction of Cu2 + salt solution with KBH4 using ultrafine SiO2 as carrier. The results of XRD, TEM and EDA show that the supported Cu / SiO2 is completely amorphous, whereas the Cu is not present in the unsupported Cu. The DSC results show that the thermal stability of amorphous Cu / SiO2 is significantly higher than that of unsupported Cu, which indicates that the ultrafine SiO2 has a stable amorphous structure. XPS results show that the copper atom in the reduction product is Cu0 state. The results of ICP analysis showed that the content of B in the samples was less than 0.1%, and only the uncoated amorphous Cu supported by SiO2 was obtained. Hydrogenolysis of methyl formate showed that amorphous Cu showed almost no activity, and that amorphous Cu / SiO2 showed higher activity at 80 ℃.