Analysis of Counter-diffusion of Aromatic Compounds on Alumina by Spectrophotometry

알루미나에서 방향족화합물의 분광광도법에 의한 역확산 해석

  • Ko, Tae-Seog (Department of Inorganic Materials Engineering, Dongshin University) ;
  • Chung, Kyeong-Hwan (Department of Petrochemical Engineering, Hanlyo Sanup University)
  • 고태석 (동신대학교 무기재료공학과) ;
  • 정경환 (한려산업대학교 석유화학과)
  • Received : 1995.05.18
  • Published : 1995.06.25

Abstract

Counter-diffusion of coronene desorbed from alumina with addition of tetra-phenylporphine was studied by spectrophotometry. The counter-diffusion processes of adsorbing and desorbing materials in liquid phase were simulated by counter-diffusion model based on Fritz's binary component isotherm under an assumption of equimass diffusion. The counter-diffusivities of desorbed coronene with addition of tetra-phenylporphine were as ${\sim}10^{-15}m^2/sec$ and that of adsorbed tetra-phenylporphine as ${\sim}10^{-11}m^2/sec$. The counter-diffusivity of coronene determined from desorption process was smaller by ${\sim}10^5$ times than the diffusivity determined from adsorption process of a single species. The reduction of the determined counter-diffusivity of coronene in desorption process was explained by the cross of diffusion fluxes and build-up of high gradient of coronene in pore.

Keywords

diffusion;alumina;spectrophotometry