Study on the Effect of Preparation Parameters of K₂CO₃/Al₂O₃ Sorbent on CO₂ Capture Capacity at Flue Gas Operating Conditions

Javad Esmaili, Mohammad Reza Ehsani

Department of Chemical Engineering, Isfahan University of Technology, Isfahan, Iran.

DOI: 10.4236/jeas.2013.32007                

Abstract

In this paper, study on the effect of preparation conditions of K₂CO₃/Al₂O₃ sorbent was done. Box-Behnken design was applied to study the influence of four parameters involve initial solution concentration, impregnation time and calcination step temperature and time. A quadratic model was used to correlate the sorbent capture capacity. The model was used to calculate the optimum conditions for preparing sorbent. From the analysis of variance (ANOVA), the most influential factor on each experimental design response was identified. The potassium-based sorbents used in this study were prepared by impregnating K₂CO₃ on Al₂O₃ support. The CO₂ capture capacity was measured in the presence of H₂O in a fixed-bed reactor at CO₂ capture temperature of 60°C using breakthrough curves. The optimum sorbent prepared by this method showed CO₂ capture capacity of 77.21 mg CO₂/g sorbent. It was observed that the experimental values obtained were in good agreement with the values predicted by the model, with relatively small errors between the predicted and the actual values. The results obtained in this study can be used as basic data for study on design and operating condition optimization of CO₂ capture process using these sorbents.

Keywords

CO₂ Capture; K₂CO₃/Al₂O₃ Sorbent; Response Surface Method; Box-Behnken Design

Conflicts of Interest

The authors declare no conflicts of interest.

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