Acidic Treatment of CaO-Based Materials for Medium-High Temperature CO2 Capture

Kuo Hsin Lin; Po Hsueh Chang; Ching Tsung Yu; San Yuan Chen

doi:10.4028/www.scientific.net/KEM.656-657.18

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Acidic Treatment of CaO-Based Materials for Medium-High Temperature CO₂Capture

Abstract:

In this work, a series of CaO-based materials for medium-high temperature (500-800 °C) CO₂ capture were synthesized from limestone by acidic treatment. In order to enhance its thermal stability, CaO-based materials were modified with Al(NO₃)₃. With various stirring time of 24, 48 and 72 hours, three types of CO₂ capture sorbent were synthesized, named LA24, LA48 and LA72, respectively. TGA results showed the CaO-based materials were activated in the CO₂ capture reaction of temperature range of 500-800 °C. LA24 exhibited the best CO₂ capture capacity of 53.8 wt % as well as stability of 93.2 % after 10 cycles test. Furthermore, all of the modified CaO-based materials showed good thermal resistance upon 900 °C. It was consistent with expectation by the contributions of alumina coexistence with calcium oxide. XRD results indicated that CaO dominated in the diffraction spectrum before capturing CO₂, and a side diffraction peak of Al₂O₃ was also observed. The characterization of CaO-based materials was also investigated by BET and SEM, respectively.