The Trade-Off between Combustion and Partial Oxidation during Chemical Looping Conversion of Methane

Francesco Miccio (), Mauro Mazzocchi, Mattia Boscherini, Alba Storione, Matteo Minelli and Ferruccio Doghieri
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Francesco Miccio: Institute of Science, Technology and Sustainability for Ceramics (ISSMC), National Research Council of Italy, Via Granarolo 64, 48018 Faenza, Italy
Mauro Mazzocchi: Institute of Science, Technology and Sustainability for Ceramics (ISSMC), National Research Council of Italy, Via Granarolo 64, 48018 Faenza, Italy
Mattia Boscherini: Department of Civil, Chemical, Environmental and Materials Engineering (DICAM), Alma Mater Studiorum, University of Bologna, Via U. Terracini 28, 40131 Bologna, Italy
Alba Storione: Department of Civil, Chemical, Environmental and Materials Engineering (DICAM), Alma Mater Studiorum, University of Bologna, Via U. Terracini 28, 40131 Bologna, Italy
Matteo Minelli: Department of Civil, Chemical, Environmental and Materials Engineering (DICAM), Alma Mater Studiorum, University of Bologna, Via U. Terracini 28, 40131 Bologna, Italy
Ferruccio Doghieri: Department of Civil, Chemical, Environmental and Materials Engineering (DICAM), Alma Mater Studiorum, University of Bologna, Via U. Terracini 28, 40131 Bologna, Italy

Energies, 2024, vol. 17, issue 11, 1-15

Abstract: The chemical looping reforming and combustion of methane have attracted increasing interest as processes for clean energy and syngas production, with potential to reduce carbon dioxide emissions. Previous literature on the development of oxygen carriers evidenced the effects that oxygen availability exerts on the selectivity of the oxidation reaction. In the present paper, we evaluate the performance of chromite sand (Chro), cerium dioxide (CeO 2 ), and mixed cerium–copper oxide (Ce–Cu) as oxygen carriers for either reforming or combustion according to their oxygen availability. The oxides are tested in 2 to 5 min reduction intervals in a CH 4 /N 2 mixture (5, 10 and 20% vol.) followed by regeneration in O 2 /N 2 (3, 5, or 21% vol.), with redox cycles conducted either at 850 °C or 950 °C. The obtained rank of selectivity towards complete CH 4 combustion is Ce–Cu > CeO 2 > Chro. Another relevant finding is the role of the degree of carrier conversion in promoting partial or total oxidation. In particular, the selectivity towards CO 2 markedly decreases at increasing carrier conversion, disclosing new strategies for process design and optimization by controlling the carrier conversion degree.

Keywords: chemical looping; combustion; reforming; methane; oxygen carrier (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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