期刊
JOURNAL OF ENVIRONMENTAL SCIENCES
卷 76, 期 -, 页码 80-88出版社
SCIENCE PRESS
DOI: 10.1016/j.jes.2018.03.028
关键词
MgO-TiO2 composite; Elevated temperature CO2 capture; Eutectic mixture promoter; MgO stability
资金
- National Research Foundation of Korea (NRF) - Ministry of Education
- NRF [2017R1D1A1B03036324]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea [20174010201160]
- National Research Foundation of Korea [2017R1D1A1B03036324] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The development of carbon dioxide (CO2) sorbents that can operate at elevated temperatures is significant for the advancement of pre-combustion capture technologies. Recently, promoter-based systems composed of alkali/alkaline earth metal nitrates and/or carbonates have been considered as next-generation solid sorbents due to their improved CO2 uptake and kinetics. However, obtaining stable MgO sorbents against temperature swing regeneration still remained challenging. Herein, we report MgO-Ti-2 solid sorbents promoted by eutectic mixture (KNO3 and LiNO3) for elevated temperature CO2 sorption. The developed sorbents show improved CO2 sorption capacity, which may be attributed to the alternative CO2 sorption pathway provided by the ionization of highly dispersed MgO in the eutectic mixture. The MgO-TiO2 framework was also shown to assist in retaining the MgO configuration by constraining its interaction with CO2. Furthermore, it is demonstrated that constructing composite structures is essential to improve the CO2 sorption characteristics, mainly recyclability, at elevated temperatures. The developed promoter integrated sorbents showed exceptionally high CO2 sorption capacity of >30 wt.% at an elevated temperature (300 degrees C) with pronounced stability under temperature swing operation. (C) 2018 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
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