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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Francesco Miccio & Mauro Mazzocchi & Mattia Boscherini & Alba Storione & Matteo Minelli & Ferruccio Doghieri, 2024. "The Trade-Off between Combustion and Partial Oxidation during Chemical Looping Conversion of Methane," Energies, MDPI, vol. 17(11), pages 1-15, June.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:11:p:2764-:d:1409158
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    References listed on IDEAS

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    1. Fosheim, Jesse R. & Hathaway, Brandon J. & Davidson, Jane H., 2019. "High efficiency solar chemical-looping methane reforming with ceria in a fixed-bed reactor," Energy, Elsevier, vol. 169(C), pages 597-612.
    2. Miccio, Francesco & Natali Murri, Annalisa & Landi, Elena, 2017. "Synthesis and characterization of geopolymer oxygen carriers for chemical looping combustion," Applied Energy, Elsevier, vol. 194(C), pages 136-147.
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