真空烧结对纳米铜粒子性能的影响

Effects of sintering in vacuum on properties of nanometer copper particles

用 ＴＥＭ、ＸＲＤ等方法研究了蒸发法制备的纳米铜粒子真空烧结后粒子尺寸及晶相的变化。将烧结处理后的铜粒子负载于低温氧化铝上，考察了对ＣＯ氧化反应的催化活性。结果表明，随处理温度的增加，纳米铜粒子烧结程度增加，尺寸变大，催化活性下降，晶相也由ＣＵ、ＣｕＯ变为Ｃｕ２Ｏ。

TEM, XRD were used to study the changes on particle size and crystal phase of nanometer copper after sintering in vacuum. The activities for CO oxidation over catalysts supported alumina were studied, in which active component nanometer copper particles were sintering in vacuum. The results show that with the increasing of sintering temperature, sintering degree and particle size of nanometer copper increase, while catalytic activities decrease, and crystal phase consisting of Cu and CuO changes into Cu2O.