Name
Enabling low-temperature chemical looping CO2 splitting using cerium-modified calcium ferrite oxygen carrier
Date & Time
Monday, September 30, 2024, 3:30 PM - 3:50 PM
Description

Human’s overdependence on the fossil fuels has led to the continual increase in the atmospheric CO2 concentration, resulting in severe environmental issues. For efficiently utilizing CO2, this paper proposes a cerium-modified oxygen carrier, as a strong electron donor, which realizes low-temperature CO2 splitting via a chemical looping-based reverse water-gas shift. Experimental results indicate that the resulting CO yield with applied 0.5CeO2-x∙Fe∙CaO oxygen carrier increases by 536 μmol∙min-1∙g-1, whose CO2 conversion is 4.26 times higher than that of Fe∙CaO at 700℃. Moreover, the oxygen carrier remains admirable redox durability after 100 CO2 splitting cycles. Characterizations (CO2-TPD-MS, in situ EPR, etc.) results show that the satisfied performance originates from the generation of more medium-strong basic sites and oxygen vacancies, synergistically promoting the adsorption of CO2 and lowering the energy barrier of C=O dissociation. In situ XAFS measurements further demonstrate the existence of Fe-O-Ce structure, which could be the nature to dominant the electron donation capability of the oxygen carriers. These findings provide valid strategies for the design and developing of new-generation oxygen carriers with strong reducing ability and satisfied redox stability.

Location Name
Max Bell 252
Full Address
Banff Centre for Arts and Creativity
107 Tunnel Mountain Dr
Banff AB T1L 1H5
Canada
Session Type
Oral Presentation
Abstract ID
1077