Abstract
CaO-based sorbents are widely used to capture CO2 in calcium looping (Ca-L) and chemical looping gasification (CLG) processes due to its relatively low material cost, high availability, fast kinetics and high theoretical CO2 capture capacity. However, a major challenge for Ca-L technology is the rapid decay of CaO during successive carbonation/calcination cycles. To overcome this loss-in-capacity defect, a novel self-assembly template synthesis (SATS) method is proposed to manufacture a hierarchical structure CaO-based sorbent (CaO/TiO2–Al2O3 sorbent). In this study, CaO sorbent (made by calcination method), CaO/Al2O3 sorbent (made by impregnation method), and CaO/TiO2–Al2O3 sorbent (made by SATS method) are manufactured to evaluate their performance on a laboratory scale. The carbonation/calcination cyclic tests of CaO-based sorbents are conducted in batch fluidized bed; in addition, the morphology features and mechanical strength before and after cyclic tests are also researched. After 10 successive cycles, it can be found that CaO/TiO2–Al2O3 sorbent achieves high CO2 capture capacity of 0.78 mol CO2/mol CaO, which is 46 and 36 % higher than those of CaO and CaO/Al2O3, respectively. Meanwhile, CaO/TiO2–Al2O3 sorbent shows high mechanical strength with an appreciable crushing strength of 1.46 N and high sintering resistance with a rich and uniform porous structure. Therefore, it can be concluded that CaO/TiO2–Al2O3 sorbent performs high and durable capture capacity, stable thermal stability, strong mechanical strength and sintering resistance compared with CaO and CaO/Al2O3 sorbents in batch fluidized bed.
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Acknowledgment
This work was funded by the National Natural Science Foundation of China (Grant No. 51390494 and 51276077). The authors are grateful to the Analytical and Testing Center of HUST for ESEM measurements.
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© 2016 Springer Science+Business Media Singapore and Tsinghua University Press
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Peng, W., Xu, Z., Zhao, H. (2016). High-Performance of SATS-Derived CaO/TiO2–Al2O3 Sorbent for CO2 Capture in Batch Fluidized Bed. In: Yue, G., Li, S. (eds) Clean Coal Technology and Sustainable Development. ISCC 2015. Springer, Singapore. https://doi.org/10.1007/978-981-10-2023-0_45
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DOI: https://doi.org/10.1007/978-981-10-2023-0_45
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