纳米晶Cu_30Al_70合金的形成及其催化活性

FORMATION AND CATALYTIC ACTIVITY OF NANOCRYSTALLINE Cu_(30)Al_(70) ALLOY CATALYST

本文利用机械球磨的方法将工业上广泛应用的传统的ＲａｎｅｙＣｕ催化剂的前体Ｃｕ３０Ａｌ７０合金制成了纳米晶合金催化材料，并研究了它在木糖加氢反应中的催化活性．结果表明，制成的纳米晶合金ＣｕＡｌ２相的平均晶粒尺寸为１２ｎｍ，球料比和球磨时间极大地影响形成的纳米晶Ｃｕ３０Ａｌ７０合金的晶粒尺寸，纳米晶Ｃｕ３０Ａｌ７０合金组织较均匀，元素分布均匀，活化后的催化剂具有较高的催化活性．

A nanocrystalline Cu30Al70 alloy catalyst precursor was produced by mechanically milling the conventional Raney copper catalyst precursor Cu30Al70 which is widly used in industry. The weight ratio of balls to sample and the milling time have significant effects on the grain size of the Cu30Al70 alloy. The mean grain size of the CuAl2 phase in the Cu30Al70 alloy is about 12 nm after 20 h ball milling. The element Cu is homogeneously distributed in the ball-milled nanocrystalline Cu30Al70 alloy. The activity of the ball-milled Raney Cu is much higher than that of the conventional Raney Cu in hydrogenation of xylose.