Advancing the carbonate looping concept for applications in post-combustion CO2 capture and Η2 production via intensified reforming of CH4 processes
Abstract
Carbonate looping, employing a solid metal oxide that undergoes continuous carbonation and carbonates decomposition cycles, comprises a promising CO2 capture technology. This thesis delved into four distinct topics that fall within the scope of carbonate looping and its application in post-combustion CO2 capture and intensified reforming processes. The first topic dealt with the preparation of MgO-based materials for intermediate-temperature (275-375 °C) CO2 capture, promoted with a ternary mixture of alkali nitrates (Li/Na/K= 30/18/52), which were found to reinforce the CO2 capture kinetics. Mineral limestone was also tested as promoter, enabling the formation of CaMg(CO3)2 in addition to MgCO3. The material with optimum composition of alkali salts and CaCO3 to MgO molar ratios of 0.20 and 0.05 respectively attained a capture of 7.2 mols CO2/kg of material at 300 °C with 30% CO2 feed and a negligible activity loss (~6%) after 50 cycles. Τhis material also attained a ~80% CO2 stripping ...
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