- 作者: Wan, Chung-Zong
- 作者服務機構: Department of Chemical Engineering National Taiwan University, Taipei, Taiwan, R.O.C.
- 中文摘要: --
- 英文摘要:
Gas mixtures such as argon, CO2 or hydrocarbon gases in helium
diffused through a porous pellet with bimodal distribution were studied by the
modified Wiche-Kallenbach method which measurements of isothermal, isobaric
counter-diffusion fluxes were made when one of the components, helium, in the
gas mixtures were in excess amount. Transition diffusion region i.e. compromise
between Knudsen diffusion flow and ordinary diffusion flow existed within the
pores at all experimental conditions. The results showed that the diffusion fluxes
could be greatly affected by the pore structure during the diffusion process and
inhibited by the presence of strongly irreversibly adsorbable species such as water
in the gas stream. This reduction was not only caused by pore blockage from the
presence of strongly adsorbable species but also was caused by the re-distribution
of the pore size. With the absence of the strongly irreversibly adsorbable
species, the significant contribution of surface migration through the micropores
of pellet to the total diffusion flux was observed. The gas-adsorbed phase interac-
tion in the counterdiffusion of helium-ethylene and helium--argon system was also
found in the micropores of the pellet. - 中文關鍵字: --
- 英文關鍵字: --