催化学报

催化学报 ›› 2011, Vol. 32 ›› Issue (2): 374-378.DOI: 10.3724/SP.J.1088.2011.01004

• 研究论文 • 上一篇    下一篇

吸附柱色谱法制备负载型纳米金催化剂

翟新磊, 徐金光, 徐秀峰, 邹旭华, 齐世学, 祁彩霞, 安立敦   

  1. 烟台大学应用催化研究所, 山东省黄金工业应用研究开发中心, 山东烟台 264005
  • 收稿日期:2010-10-08 修回日期:2010-12-03 出版日期:2011-01-26 发布日期:2014-06-25

Preparation of Supported Nano-gold Catalyst by Adsorption Column Chromatography

ZHAI Xinlei, XU Jinguang*, XU Xiufeng, ZOU Xuhua, QI Shixue, QI Caixia, AN Lidun   

  1. Institute of Applied Catalysis, Yantai University, Shandong Gold Industrial Applied Research and Development Center, Yantai 264005, Shandong, China
  • Received:2010-10-08 Revised:2010-12-03 Online:2011-01-26 Published:2014-06-25

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1091

被引次数

3

摘要： 采用吸附柱色谱新方法制备 Au/Al2O3 催化剂, 并用于低温 CO 氧化反应, 考察了 Au 盐溶液 pH 值及其与载体的液固比、载体比表面积和竞争吸附质等对 Au 催化剂性能的影响. 结果表明, Au 前驱体溶液的 pH 值为 9, 液固比为 6, 优先吸附丙酮制得的催化剂 Au 颗粒大小分布均匀, 粒径为 5 nm 左右, 在25 oC 即可实现 CO 完全转化. 载体 Al2O3 比表面积对催化剂性能影响也较大. 另外, 优先加入的竞争吸附质的极性越低, 所制催化剂上 Au 颗粒的分布越均匀. 该法可提高 Au 利用率, 有效去除有毒 Cl-, 为大规模制备 Au 催化剂提供了一条有效途径.

关键词: 吸附柱色谱法, 金, 一氧化碳, 氧化, 纳米结构, 液固比

Abstract: A new method called adsorption column chromatography for the preparation of supported nano-gold catalysts was proposed. Au/Al2O3 was used as the model catalyst, and low-temperature CO oxidation was used as the model reaction. Effects of pH value of gold precursor solution, liquid-to-solid ratio of the gold precursor solution to the support, specific surface area of the support, and competition adsorbates such as water, ethanol, isopropanol, and acetone on the nano-structure of the gold catalyst were investigated. The optimal conditions are the pH value of gold precursor solution of 9, the liquid-to-solid ratio of 6:1, and acetone as the preferential adsorbate. Gold particles on the prepared Au/Al2O3 catalyst are well distributed and about 5 nm in diameter. The temperature for CO complete conversion is -25 oC. The specific surface area of Al2O3 has great impact on the Au/Al2O3 catalyst. The lower the polarity of the preferential adsorbate, the better the distribution of gold particles on the support. This method can improve the utilization ratio of gold and effectively remove toxic chlorine ions, and therefore it provides an effective way for the large-scale preparation of gold catalysts.

Key words: adsorption column chromatography, gold, carbon monoxide, oxidation, nano-structure, liquid-to-solid ratio