物理化学学报 >> 1985, Vol. 1 >> Issue (02): 200-204.doi: 10.3866/PKU.WHXB19850213

研究简报 上一篇    

氨氧化钴催化剂的表面研究

张知廉; 戴新鹤   

  1. 化学工业部化肥工业研究所
  • 收稿日期:1984-08-21 修回日期:1985-01-10 发布日期:1985-04-15

SURFACE RESEARCH OF COBALT CATALYSTS FOR OXIDATION OF AMMONIA

Zhang Zhilian; Dai Xinhe   

  1. Institute of Fertilizer Industry; Ministry of Chemical Industry
  • Received:1984-08-21 Revised:1985-01-10 Published:1985-04-15

Abstract: The surface morphology,crystallite size distribution, and the surface and depth analyses for the coneentratons of impurity elements and cobalt oxide ions of several samples of Co_3O_4 catalyst for ammonia oxidation, which were obtained under various conditions for preparation, calination,usage,and regeneration, were observed by means of a transmission electron microscopy(TEM), a scanning electron microscopy(SEM),and an ion microprobe mass analyzer (IMMA). The observed results are discussed in relating with the experimental activity of the catalyt. It is concluded that the possible causes of the decline in the activity of the catalyst are that the impurity elements transport from the bulk phase and enrich onto the surface and the cobalt oxide ions on the surface decrease when the catalyst has been used at the high temperature for a long time.