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Kinetics and Reactor Design Aspects of Selective Methanation of CO over a Ru/γ-Al 2 O 3 Catalyst in CO 2 /H 2 Rich Gases

Author

Listed:
  • Panagiota Garbis

    (Chair of Chemical Engineering, Center of Energy Technology, University Bayreuth, 95440 Bayreuth, Germany)

  • Christoph Kern

    (Chair of Chemical Engineering, Center of Energy Technology, University Bayreuth, 95440 Bayreuth, Germany)

  • Andreas Jess

    (Chair of Chemical Engineering, Center of Energy Technology, University Bayreuth, 95440 Bayreuth, Germany)

Abstract

Polymer electrolyte membrane fuel cells (PEMFCs) for household applications utilize H 2 produced from natural gas via steam reforming followed by a water gas shift (WGS) unit. The H 2 -rich gas contains CO 2 and small amounts of CO, which is a poison for PEMFCs. Today, CO is mostly converted by addition of O 2 and preferential oxidation, but H 2 is then also partly oxidized. An alternative is selective CO methanation, studied in this work. CO 2 methanation is then a highly unwanted reaction, consuming additional H 2 . The kinetics of CO methanation in CO 2 /H 2 rich gases were studied with a home-made Ru catalyst in a fixed bed reactor at 1 bar and 160–240 °C. Both CO and CO 2 methanation can be well described by a Langmuir Hinshelwood approach. The rate of CO 2 methanation is slow compared to CO. CO 2 is directly converted to methane, i.e., the indirect route via reverse water gas shift (WGS) and subsequent CO methanation could be excluded by the experimental data and in combination with kinetic considerations. Pore diffusion may affect the CO conversion (>200 °C). The kinetic equations were applied to model an adiabatic fixed bed methanation reactor of a fuel cell appliance.

Suggested Citation

  • Panagiota Garbis & Christoph Kern & Andreas Jess, 2019. "Kinetics and Reactor Design Aspects of Selective Methanation of CO over a Ru/γ-Al 2 O 3 Catalyst in CO 2 /H 2 Rich Gases," Energies, MDPI, vol. 12(3), pages 1-15, February.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:3:p:469-:d:202654
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    Citations

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    Cited by:

    1. Eun-Shin Bang & Myoung-Hwan Kim & Sang-Kyun Park, 2022. "Options for Methane Fuel Processing in PEMFC System with Potential Maritime Applications," Energies, MDPI, vol. 15(22), pages 1-16, November.
    2. Panagiota Garbis & Andreas Jess, 2020. "Selective CO Methanation in H 2 -Rich Gas for Household Fuel Cell Applications," Energies, MDPI, vol. 13(11), pages 1-11, June.
    3. Sorrenti, Ilaria & Harild Rasmussen, Theis Bo & You, Shi & Wu, Qiuwei, 2022. "The role of power-to-X in hybrid renewable energy systems: A comprehensive review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 165(C).
    4. Sukhe Badmaev & Vladimir Sobyanin, 2020. "Production of Hydrogen-Rich Gas by Oxidative Steam Reforming of Dimethoxymethane over CuO-CeO 2 /γ-Al 2 O 3 Catalyst," Energies, MDPI, vol. 13(14), pages 1-10, July.

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