Abstract
Using aluminum nitrate (AlN) and bauxite tailings (BTs) as different dopants, and lime mud (LM) as calcium source, a series of CaO-based sorbents were prepared for CO2 capture by dry mixing method; then, the carbonation conversions of multiple carbonation/calcination cycles were detected in a thermogravimetric analyzer (TGA). Effects of different dopants, dopant contents, precalcination conditions, and a long series of cycles on CO2 absorption properties were scrutinized, and the phase composition and morphologies were tested by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Durability studies show that the sample doped with AlN remains a higher absorption conversion (30.88%) after 30 carbonation/calcination cycles. In the meantime, the sorbent doped with BTs showed a lower conversion, which is probably resulted from the impurities from waste BTs. However, the sample BT has a better cyclic absorption stability. In addition, the incorporation of BTs, as a kind of solid waste, not only decreases the preparation cost but also is good for environment. The occurrence of Ca12Al14O33 phase is considered to provide a stable framework inhibiting inactivation of CaO, and improve the CO2 adsorption stability.
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This work has been sponsored by National Natural Science Foundations of China (21766016, 21566014, and 51364023) and the Yunnan Talent Reserve Project (2015HB014).
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Zhang, Y., He, L., Ma, A. et al. CaO-based sorbent derived from lime mud and bauxite tailings for cyclic CO2 capture. Environ Sci Pollut Res 25, 28015–28024 (2018). https://doi.org/10.1007/s11356-018-2825-1
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DOI: https://doi.org/10.1007/s11356-018-2825-1