CO2 Adsorption on HZSM-5 Zeolite : Mass Transport Study in A Packed Bed Adsorber

Sang Kompiang Wirawan (Department of Chemical Engineering, Gadjah Mada University, 55281 Yogyakarta, Indonesia Chemical Reaction Engineering, Chalmers University of Technology, SE-412 96, Göteborg, Sweden)
Ihda Novia Indrajati (Department of Chemical Engineering, Gadjah Mada University, 55281 Yogyakarta, Indonesia)
Wahyudi Budi Sediawan (Department of Chemical Engineering, Gadjah Mada University, 55281 Yogyakarta, Indonesia)
Panut Mulyono (Department of Chemical Engineering, Gadjah Mada University, 55281 Yogyakarta, Indonesia)
Derek Creaser (Chemical Reaction Engineering, Chalmers University of Technology, SE-412 96 Göteborg, Sweden)

ASEAN Journal of Chemical Engineering
Vol 8, No 1 & 2 (2008)

Experimental and modeling have been done to study and to determine the diffusion parameters of CO2 adsorption on HZSM-5 zeolite in a packed­bed adsorber. Experiment works consisted of tracer and adsorption experiments. The feed gas concentrations were 40 and 80% CO2 in helium within various temperatures of 373, 423 and 473 K. The experiments were conducted by using transient step change adsorption. Tracer experiments using 20% Ar/He were conducted to measure dispersion and time lag effect of the packed bed system. A model of CO2 adsorption on HZSM­5 had been set up for transient packed­bed adsorber by assuming plug flow, isothermal and isobaric, single site Langmuir physisorption, no gas film mass transport resistance and Maxwell­Stefan mass transport in micropore applied. All the data were then optimized to get the best value of modified fitted parameter. The results indicated that at higher temperature, the quantities of gas adsorbed were decrease. This was due to lower adsorption capacity which occurs at higher temperature. The model was in a good agreement with the experiment data. Diffusivity tended to increase by increasing temperatures.