التفاصيل البيبلوغرافية
| العنوان: |
Influence of additives on CaCO3 precursors and multicycle CO2 capture performance of CaO sorbents. |
| المؤلفون: |
Yue, Wenfei, Fan, Chuigang, Song, Wenli, Li, Songgeng |
| المصدر: |
Journal of Environmental Chemical Engineering; Jun2022, Vol. 10 Issue 3, pN.PAG-N.PAG, 1p |
| مصطلحات موضوعية: |
CHEMICAL-looping combustion, CARBON sequestration, SORBENTS, CETYLTRIMETHYLAMMONIUM bromide, VATERITE, CARBON dioxide |
| مستخلص: |
Calcium looping based on alternation between uptake and release of CO 2 is a promising technology for high-temperature CO 2 capture. In this study, CaO sorbents were obtained from different precipitated CaCO 3 precursors. Two additives, cetyltrimethyl ammonium bromide (CTAB) and triblock copolymer (P123), were used to modify CaCO 3 precursors. Physical properties (morphology, crystal structure and porosity) of CaCO 3 precursors, as well as CO 2 capture performance of CaO sorbents were investigated. It was found that the presence of different concentration of additive would affect crystal composition and porosity of CaCO 3 precursor. Experimental data showed that CaO sorbents derived from CaCO 3 modified with 8 mmol/L CTAB exhibited higher CO 2 capture capacity than other CaO sorbents after multiple cycles. Furthermore, the relationship between CO 2 capture performance and properties of CaCO 3 precursors was established. BET surface area and pore volume of CaCO 3 precursors were positive correlated to average carbonation conversion. For CTAB cases, molar ratio of vaterite to calcite was negatively correlated to average carbonation conversion; and for P123 cases, molar ratio of vaterite to calcite was positively correlated to average conversion. [Display omitted] • Additives affected crystal composition and physical properties of CaCO 3 precursor. • Excellent cycle stability and CO 2 capture capacity were obtained from CaO sorbent derived from CaCO 3 with 8 mmol/L CTAB. • BET surface area and pore volume of CaCO 3 precursors were positive correlated to CO 2 capture performance of CaO sorbents. • Crystal composition of CaCO 3 precursors modified with CTAB and P123 affected CO 2 capture performance of CaO sorbents. [ABSTRACT FROM AUTHOR] |
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