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Efficient MgO-doped CaO sorbent pellets for high temperature CO2 capture

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Abstract

Novel MgO-doped CaO sorbent pellets were prepared by gel-casting and wet impregnation. The effect of Na+ and MgO on the structure and CO2 adsorption performance of CaO sorbent pellets was elucidated. MgO-doped CaO sorbent pellets with the diameter range of 0.5–1.5 mm exhibited an excellent capacity for CO2 adsorption and adsorption rate due to the homogeneous dispersion of MgO in the sorbent pellets and its effects on the physical structure of sorbents. The results show that MgO can effectively inhibit the sintering of CaO and retain the adsorption capacity of sorbents during multiple adsorption-desorption cycles. The presence of mesopores and macropores resulted in appreciable change of volume from CaO (16.7 cm3·mol−1) to CaCO3 (36.9 cm3·mol−1) over repeated operation cycles. Ca2Mg1 sorbent pellets exhibited favorable CO2 capture capacity (9.49 mmol·g−1), average adsorption rate (0.32 mmol·g−1·min−1) and conversion rate of CaO (74.83%) after 30 cycles.

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Acknowledgements

Financial support by the National Key Research and Development Program of China (Grant No. 2017YFB0603300), the Program for New Century Excellent Talents in University (Grant No. NCET-13-0411) are gratefully acknowledged.

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Authors and Affiliations

  1. Key Laboratory for Green Chemical Technology (Ministry of Education), Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China

    Zhihong Xu, Tao Jiang, Hao Zhang, Yujun Zhao, Xinbin Ma & Shengping Wang

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  1. Zhihong Xu
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  2. Tao Jiang
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Correspondence to Shengping Wang.

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Xu, Z., Jiang, T., Zhang, H. et al. Efficient MgO-doped CaO sorbent pellets for high temperature CO2 capture. Front. Chem. Sci. Eng. 15, 698–708 (2021). https://doi.org/10.1007/s11705-020-1981-2

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