物理化学学报 >> 1990, Vol. 6 >> Issue (03): 263-268.doi: 10.3866/PKU.WHXB19900303

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MoO3和CuCl在γ-Al2O3表面分散速度和分散机理的研究

徐献平; 谢有畅; 赵璧英; 唐有祺   

  1. 北京大学物理化学研究所
  • 收稿日期:1990-01-04 修回日期:1990-02-14 发布日期:1990-06-15
  • 通讯作者: 徐献平

Study on Dispersion Speed and Mechanism of MoO3 and CuCl on the Surface of γ-Al2O3

Xu Xian-Ping; Xie You-Chang; Zhao Bi-Ying; Tang You-Qi   

  1. Institute of Physical Chemistry, Peking University
  • Received:1990-01-04 Revised:1990-02-14 Published:1990-06-15
  • Contact: Xu Xian-Ping

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Abstract: It has been shown that many oxides and salts can disperse spontaneously onto supports with large surface area~[1]. A typical example studied widely is the dispersion of MoO_3 on γ-Al_2O_3. However, the research work about the dispersion mechanism and kinetics is quite few.
Knozinger etc.~[2] suggested that the dispersion of MoO_3 onto the surface of γ-Al_2O_3 may occur through a "gas phase transport" mechanism mainly by assuming an intermediate MoO_2(OH)_2(g), and the presence of water is necessary. Their conclusion was based on a fact that after heating a mixture of MoO_3 and γ-Al_2O_3 in the presence of H_2O vapour at 450 ℃, the characteristic peak at 950 cm~(-1) of monolayer dispersed MoO_3 in Laser Raman Spectrum (in situ) appears, but after heating the mixture in dry oxygen, it can not be observed...