화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.19, No.3, 835-840, May, 2013
DOI10.1016/j.jiec.2012.10.028  Export Citation
Direct measurements of gas diffusivity in a washcoat layer under steady state conditions at ambient temperature
Satoru Kato†, Hironobu Ozeki1, Hiroshi Yamada1, Tomohiko Tagawa1, Naoki Takahashi, and Hirofumi Shinjoh
  • Toyota Central R & D Labs., Inc., Nagakute, Aichi 480-1192, Japan
  • 1Deparment of Chemical Engineering, Nagoya University, Chikusa Ku, Nagoya, Aichi 464-8603, Japan
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A method for directly measuring gas diffusivity in a washcoat layer was established by preparing a simulated washcoat layer and modifying a Wicke-Kallenbach type counter-current diffusion cell. Three pairs of gases, N2-Ar, CO2-Ar and C3H8-Ar, were used in the measurements. It was found to be possible to evaluate the pore-transport parameters of the washcoat layer based on the mean transport pore model and the modified Stefan.Maxwell equation. Analysis of the gas diffusion mechanism in the washcoat layer showed that bulk and Knudsen diffusion took place simultaneously, and the percentage value of the contribution by Knudsen transport to net diffusion transport was evaluated.
Keywords:Catalyst;Diffusion;Porous material;Pore size distribution;Washcoat layer
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