Abstract
A flux equation of diffusion for bi-disperse porous catalyst pellets was proposed by modifying the previously developed model equation over fractal trajectories. The proposed fractal model equation considered the same tortuous degree for both micro-and macro-pores. The experimental data of diffusion over a bi-disperse Ni/gamma-alumina pellet were obtained with a standard Wicke-Kallenbach diffusion cell for both carbon monoxide-ethylene and carbon dioxide-ethylene binary mixtures. The fitting between experimental results and the fractal model equation leads to a fractal dimension of 1.11. The prediction of diffusion flux over the bi-disperse Ni/gamma-alumina pellet by the proposed fractal model equation is much better than the traditional tortuosity-based model equation by comparison with the measured flux through the pellet.
Original language | English (US) |
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Pages (from-to) | 471-476 |
Number of pages | 6 |
Journal | Chinese Journal of Chemical Engineering |
Volume | 13 |
Issue number | 4 |
State | Published - Aug 2005 |
Keywords
- Catalyst
- Diffusion
- Fractal
- Porous media
ASJC Scopus subject areas
- Environmental Engineering
- Biochemistry
- General Chemistry
- General Chemical Engineering