摘要
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。
The Au nanoparticles with different sizes are prepared by chemical reduction and seed media growth,and then are supported on activated carbon to prepared catalysts. The obtained catalysts are used for the liquid phase catalytic oxidation of glyoxal to glyoxalic acid. The size of Au nanoparticles is characterized by TEM. The effects of the Au nanoparticies sizes on the reaction velocity,yield and selectivity of glyoxalic acid in the catalysts preparing process are investigated. The results show that there is a visible dimensional effect of the gold nanoparticles in the Au / C catalyst,and 1% Au / C catalyst with the gold nanoparticles in approximately 3. 5 nm average diameter supported on the activated carbon is of the optimal catalytic activity.
出处
《有色金属工程》
CSCD
北大核心
2016年第2期6-10,共5页
Nonferrous Metals Engineering
基金
稀贵金属综合利用新技术国家重点实验室项目(SKL-SPM-201543)
关键词
材料化学
纳米粒子
尺寸效应
Au/C催化剂
乙二醛氧化
乙醛酸
materials chemistry
nanoparticies
dimensional effect
Au/C catalyst
glyoxal oxidation
glyoxalic acid
