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.
Highlights
Global warming increasingly thought to be associated with the atmospheric emission of greenhouse gases
The second order polynomial model (Equation (1)), which characterizes the relationship between sorbent capture capacity and studied variables, was obtained
The sorbent capacity for carbon dioxide capture from a gas stream is important for the industrial application of solid sorbents
Summary
Global warming increasingly thought to be associated with the atmospheric emission of greenhouse gases. Carbon Dioxide is a major greenhouse gas that is released into the atmosphere due to the use of fossil fuels. It can be removed from flue gas by various methods such as membrane separation, amine scrubbing, and using molecular sieves [1,2,3]. These methods are costly and energy intensive. The use of solid sorbents can be a highly cost-effective and energy efficient way to remove CO2 [4,5,6,7]. Sorbents containing alkali and alkaline-earth metals like potassium carbonate and calcium oxide are investigated for this commercial feasibility [8]
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