The present paper is the first part of a series of papers about a systematical investigation on the application of the K 2 CO 3 /Al 2 O 3 sorbent for capturing CO 2 in flue gas. It was focused on the carbonation behaviors of K 2 CO 3 /Al 2 O 3 in a thermogravimetric analyzer. The effects of the temperature, gas composition, and pressure on the reactions were studied by analyzing the experimental breakthrough data. It was found that K 2 CO 3 /Al 2 O 3 shows a high CO 2 capture capacity and its carbonation conversion reaches 68.3–91.8% in 20 min when the reaction temperature is in the range of 55–75 °C, the CO 2 concentration is in the range of 5–20%, the H 2 O concentration is in the range of 12–21%, and the pressure is 0.1 MPa. The total carbonation conversion mainly depends upon the reaction in the first 5 min, and the reaction rate reaches the maximum in about 2 min. The total carbonation conversion increases with the increase of CO 2 and H 2 O concentrations but decreases with the increase of the temperature and pressure. Among the factors studied, the H 2 O concentration and pressure were found to have a significant impact on the carbonation. Moreover, water pretreatment of the sorbent plays an important role in the carbonation reaction.
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Zhao et al. (2012) studied this question.
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