Journal
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 260, Issue -, Pages -Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2019.110054
Keywords
CO2 capture; Carbonation; Decarbonation; Mg compounds
Categories
Funding
- National Key Research and Development Project [2018YFE0107400]
- Ministry of Science and Technology of the People's Republic of China
- Fundamental Research Fund for the Central Universities [buctrc201726]
- Beijing University of Chemical Technology
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering of Beijing University of Chemical Technology
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The abatement of CO2 emitted from combustion is a hot research topic. Current CO2 capture techniques of adsorption, absorption, membrane separation and cryogenics involve high investment and operation costs. For moderate and high temperature exhaust gas, carbonation/decarbonation cycles offer an attractive alternative. An objective assessment method (screening index) was applied to select the most appropriate chemical reactions, with MgO and Mg(OH)(2) being screened as having the highest potential. Macro-thermogravimetric experiments determined a CO2 capture yield between 60 and 70% for Mg(OH)(2) at temperatures between 260 and 330 degrees C, and from 85 to 98% for MgO at temperatures of 400-440 degrees C. Reaction rates were measured for both MgO-CO2 and Mg(OH)(2)-CO2. The reaction kinetics are best fitted by the Jander 3D-diffusion approach. The Arrhenius equation is applied to the reaction rate constant, and both its activation energy and pre-exponential factor are determined. Integrating the Jander expression in the reaction rate equation enables to predict the CO2-capture conversion for any selected temperature and/or contact time.
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