催化学报

催化学报 ›› 2007, Vol. 28 ›› Issue (7): 657-661.

• 研究论文 • 上一篇    下一篇

纳米金催化剂的抗水性能和抗硫中毒性能

王东辉,董同欣,史喜成,张忠良   

  1. 中国人民解放军防化研究院, 北京 100083
  • 收稿日期:2007-07-25 出版日期:2007-07-25 发布日期:2011-07-25

Resistance of Nano-Sized Gold Catalysts to Water and Sulfur Poisoning

WANG Donghui, DONG Tongxin, SHI Xicheng*, ZHANG Zhongliang   

  1. Research Institute of Chemical Defence, The Chinese People′s Liberation Army, Beijing 100083, China
  • Received:2007-07-25 Online:2007-07-25 Published:2011-07-25

PDF

1204

被引次数

32

摘要： 与Au/Al2O3相比,复合载体负载的Au/FeOx/Al2O3具有更高的催化CO氧化的低温活性和稳定性,且表现出湿度增强效果,水分压为550～1600Pa时催化剂活性较高. 在完全无水的环境中,催化剂发生快速不可逆失活; 在饱和水汽的环境中,催化剂发生缓慢可逆失活. 在水汽作用下的失活与纳米金粒子的粒径长大有关. 助剂对催化剂抗水性能影响不大,但对抗硫中毒性能的影响较大. Au/CeO2/Al2O3催化剂显示有最佳的抗硫中毒性能. 催化剂表面硫化物和硫酸盐的生成是导致催化剂不可逆硫中毒失活的主要原因.

关键词: 纳米粒子, 金, 复合载体, 负载型催化剂, 一氧化碳, 氧化, 湿度, 硫, 中毒

Abstract: Au/FeOx/Al2O3 showed more active and stable than Au/Al2O3 in CO oxidation at low temperature. Moisture enhanced the activity of the nano-sized gold catalyst, and higher CO conversion appeared at water partial pressure of 550-1600 Pa in the feed gas. The catalyst was deactivated fast and irreversibly in dry feed gas but slow and reversibly in saturated vapor. The gold particle size increased in the catalyst that was deactivated by saturated vapor. The promoters had no effect on water resistance but had a visible effect on the resistance to H2S or SO2. The main reason of deactivation was the appearance of sulfide or sulfate on the catalyst surface.

Key words: nano-sized particle, gold, composite support, supported catalyst, carbon monoxide, oxidation, moisture, sulfur, poison