Acta Phys. -Chim. Sin. ›› 1991, Vol. 7 ›› Issue (05): 543-548.doi: 10.3866/PKU.WHXB19910506

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Preparation of Highly Dispersed Supported Metal Catalyst VIA Solvated Metal Atom Impregnation II. Dispersions and Catalytic Properties of Supported Fe,Co,Ni Catalysts

Wu Shi-Hua; Zhao Wei-Jun; Yang Shu-Jun; Wang Xu-Kun; Zhang Shu-Ji; Fang Yan-Quan   

  1. Laboratory of Elemento-Organic Chemistry and Department of Chemistry, Nankai University, Tianjin 300071
  • Received:1990-06-12 Revised:1990-11-23 Published:1991-10-15
  • Contact: Wu Shi-Hua

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Abstract: A new method, Solvated Metal Atom Impregnation (SMAI) technique, was em- ployed to prepare Fe/γ-Al_2O_3, Fe/SiO_2, Co/γ-Al_2O_3, Co/SiO_2, Ni/γ-Al_2O_3 and Ni/SiO_2 catalysts. The results of TEN, XRD and H_2 chemisorption measurements showed that the average particle dimensions of Fe, Co, Ni in these catalysts were <3.0 nm and the dispersions of the metals were >500%. The catalytic behavior of Fe/γ-Al_2O_3, Co/γ-Al_2O_3 and Ni/γ-Al_2O_3 for CO+H_2 reaction was studied. Hydrocarbon product distributions and specifie activities were determined. It showed that, as the H_2/CO ratio and reaction temperature increased, the percentage yield of higher molecular weight molecules decreased and methane formation was favored. The specific activites of these catalysts was in the order as Fe>Ni>Co.

Key words: Metal vapour synthesis, Solvated metal atom, Fe,Co,Ni catalysts, CO+H2 reaction