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Derek Creaser
Chemical Reaction Engineering, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry

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Adsorption of CO, CO2 and H2 in Silicalite-1: measurements and simulations Sang Kompiang Wirawan; Martin Petersson; Derek Creaser
ASEAN Journal of Chemical Engineering Vol 8, No 1 & 2 (2008)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (296.713 KB) | DOI: 10.22146/ajche.50113

Abstract

Single component and mixture adsorption of CO2, CO and H2 in Silicalite-1 was studied with the step response experiments and through molecular simulations. Experiments were performed at 323.15, 373.15 and 473.15 K, and in the pressure range 10.13 to 81.06 kPa. CO2 adsorption was favored over CO during all studied conditions. The adsorption enthalpies were -24.3 and -13.5 kJ/mol for CO2 and CO respectively. Adsorption simulations were performed using the Grand Canonical Monte Carlo method. A new zeolite framework potential was derived, and was shown to give good agreement with the experimental results. The major reason for the higher saturation loading of CO2 compared to CO is however the stronger sorbate-zeolite attraction for CO2. The affinity for CO2 also causes a decrease in the adsorbed molar fraction of CO due to the competition with CO2.
CO2 Adsorption on HZSM-5 Zeolite : Mass Transport Study in A Packed Bed Adsorber Sang Kompiang Wirawan; Ihda Novia Indrajati; Wahyudi Budi Sediawan; Panut Mulyono; Derek Creaser
ASEAN Journal of Chemical Engineering Vol 8, No 1 & 2 (2008)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (173.145 KB) | DOI: 10.22146/ajche.50116

Abstract

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.
Co-Authors Ihda Novia Indrajati Martin Petersson Panut Mulyono Sang Kompiang Wirawan Wahyudi Budi Sediawan