Measurement of CO₂ adsorption kinetics on activated carbons suitable for gas storage systems

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• 作者：Vinod Kumar Singh and E. Anil Kumar
• 刊名：Greenhouse Gases: Science and Technology
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：7
• 期：1
• 页码：182-201
• 全文大小：2029K
• ISSN：2152-3878

文摘

The adsorption kinetics of CO₂ on three commercially available activated carbons namely Norit RB3 (steam activated rod) (RB3), Norit Darco 100 mesh size (Darco 100 mesh), and Norit Darco 12 × 20 US mesh size (Darco 12 × 20) are measured using Sievert's apparatus at different supply pressures (1, 5, 10, and 20 bar) and temperatures (298, 308, 318, and 338 K). Extracts of experimental results of CO₂ adsorption kinetics are used for mathematical modelling using different standard models, such as pseudo-first order, pseudo-second order, Elovich, and intra-particle diffusion kinetics models. The adsorbate-adsorbent interactions and kinetics behavior of CO₂ adsorption on adsorbents are deduced from the best-fitted kinetics model. Based on coefficient of correlation and normalized standard deviation, it has been found that pseudo-second order kinetics model very well suits with the experimental data of CO₂ adsorption kinetics. Activation energies at different pressures are calculated by fitting the Arrhenius equation to the adsorption kinetics data. Analysis of the mechanism of interaction between CO₂ molecules and adsorbents during the adsorption process is attempted using interparticle and Boyd's diffusion models. It has been found that the film-diffusion is an important rate controlling step in CO₂ adsorption process.