纳米Au/C催化剂在乙二醛转化为乙醛酸反应中的尺寸效应

用化学还原及晶种媒介生长法制备不同尺寸的金纳米粒子,将其负载在活性炭上获得Au/C催化剂,应用于液相催化氧化乙二醛制备乙醛酸的反应。用TEM表征金粒子的尺寸,研究金纳米粒子尺寸因素对反应速率、产率及选择性等催化性能的影响。结果表明,金纳米催化剂存在着明显的尺寸效应,其中金纳米粒子尺寸在3.5 nm负载形成的1%Au/C催化剂的催化活性最高。

Dimension Effect of Nano-Au/C Catalysts in the reaction ofGlyoxal into Glyoxalic Acid

Different sizes of Au nanoparticies were prepared by chemical reduction and method, and then were supported on activated carbon, respectively. The catalysts obtained were used for the liquid phase catalytic oxidation of glyoxal to glyoxalic acid. Based on the characterizations of Au nanoparticles sizes by TEM.The effect of the sizes of Au nanoparticies in the process of preparing catalysts on reaction velocity, yield and selectivity of glyoxalic acid etc. was investigated. Test results show that there was a visible dimension effect of gold nanoparticles in the Au/C catalyst. When the gold nanoparticles with approximately 3.5 nm average diameters were supported on activated carbon, the 1% Au/C catalyst had high catalytic activity.