【摘要】 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．更多还原

【Abstract】 Amorphous Cu and Cu/SiO 2 catalysts are prepared by chemical reduction of Cu²⁺ with KBH 4. Their phase structures are verified by XRD, TEM and electron diffraction. It is found that Cu/SiO 2 is in amorphous state, but amorphous Cu is partially in crystalline one. The DSC indicates that amorphous Cu/SiO 2 has higher stability. ICP analysis shows that Cu and B do not form amorphous Cu B during chemical reduction, and only single amorphous Cu is got. The hydrogenolysis results of methyl formate exhibit that, the amorphous Cu can not hydrogenate methyl formate to methanol, the amorphous Cu/SiO 2 show higher catalytic activity at 80℃.更多还原