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Effects of alumina phases on CO2 sorption and regeneration properties of potassium-based alumina sorbents

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Abstract

A range of potassium-based alumina sorbents were fabricated by impregnation of alumina with K2CO3 to examine the effects of the structural and textural properties of alumina on the CO2 sorption and regeneration properties. Alumina materials, which were used as supports, were prepared by calcining alumina at various temperatures (300, 600, 950, and 1,200 °C). The CO2 sorption and regeneration properties of these sorbents were examined during multiple tests in a fixed-bed reactor in the presence of 1 vol% CO2 and 9 vol% H2O. The regeneration capacities of the potassium-based alumina sorbents increased with increasing calcination temperature of alumina. The formation of KHCO3 increased with increasing calcination temperature during CO2 sorption, whereas the formation of KAl(CO3)(OH)2, which is an inactive material, decreased. These results is due to the fact that the structure of alumina by the calcination temperature is related directly to the formation of the by-product [KAl(CO3)(OH)2]. The structure of alumina plays an important role in enhancing the regeneration capacity of the potassium-based alumina sorbent. Based on these results, a new potassium-based sorbent using δ-Al2O3 as a support was developed for post-combustion CO2 capture. This sorbent maintained a high CO2 capture capacity of 88 mg CO2/g sorbent after two cycles. In particular, it showed a faster sorption rate than the other potassium-based alumina sorbents examined.

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Acknowledgments

This work was supported by R&D program under Agency for Defense Development, Republic of Korea. We acknowledge the financial support by grants from Korea CCS R&D Center, funded by the Ministry of Education, Science and Technology of Korean government. This work was supported by the Energy Efficiency & Resources of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Knowledge Economy (2010201020007A).

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Authors and Affiliations

  1. Research Institute of Advanced Energy Technology, Kyungpook National University, Daegu, 702-701, Korea

    Soo Chool Lee & Suk Yong Jung

  2. Department of Chemical Engineering, Kyungpook National University, Daegu, 702-701, Korea

    Min Sun Cho & Jae Chang Kim

  3. Korea Electric Power Research Institute, Daejon, 305-380, Korea

    Chong Kul Ryu

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  1. Soo Chool Lee
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  2. Min Sun Cho
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Correspondence to Jae Chang Kim.

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Lee, S.C., Cho, M.S., Jung, S.Y. et al. Effects of alumina phases on CO2 sorption and regeneration properties of potassium-based alumina sorbents. Adsorption 20, 331–339 (2014). https://doi.org/10.1007/s10450-013-9596-2

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