物理化学学报 >> 1997, Vol. 13 >> Issue (01): 52-55.doi: 10.3866/PKU.WHXB19970110

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用化学动力学方法估算颗粒表面的分维

郭向云,钟炳,彭少逸   

  1. 中国科学院山西煤炭化学研究所，太原 030001
  • 收稿日期:1996-05-02 修回日期:1996-08-08 发布日期:1997-01-15
  • 通讯作者: 郭向云

Determination of the Fractal Dimension of Particle Surface by Chemical Kinetic Method

Guo Xiang-Yun,Zhong Bing,Peng Shao-Yi   

  1. Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001
  • Received:1996-05-02 Revised:1996-08-08 Published:1997-01-15
  • Contact: Guo Xiang-Yun

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关键词: 分形表面, 谱维数, 化学动力学方法, 氢脱附, Monte Carlo模拟

Abstract:

A chemical kinetic method based on the kinetic expression of the second-order reaction on fractals is used to determine the spectral dimension of fractal surfaces. The method can conveniently give the spectral dimension by analyzing the relation between reactant concentration and reaction time (ct～t). The spectral dimension of the Diffusion-Limited Aggregate (DLA) is obtained by Monte Carlo simulation of the desorption process of chemisorbed hydrogen from DLA, and it is in agreement, with that in literature. Also, the spectral dimension of a real catalyst 12% Ni/Al2O3 is obtained by the method.

Key words: Fractal surface, Spectral dimension, Chemical kinetic method, Hydrogen desorption, Monte Carlo simulation