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The role of activated carbon size in the catalytic cracking of naphthalene

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  • Parrillo, F.
  • Ruoppolo, G.
  • Arena, U.

Abstract

Activated carbons are efficient catalysts for tar cracking, suitable for hot cleaning of the syngas produced during biomass- and waste-to-energy gasification processes. This study investigates the conversion of naphthalene, utilised as reference for tar compounds, when catalysed by a coal-derived activated carbon. The attention focuses on the influence of the operating temperature, in the range 750–900 °C, and the size of selected activated carbon, which has been used under form of pellets, granules and powders. The conversion efficiency improves when the temperature raised from 750 °C to 900 °C (from 79% to 99%, for the pellets), and when the catalyst size reduced from pellets to powders (from 79% to 97%, at 750 °C). The diffusional resistance in the catalyst particles has been then quantified in terms of Thiele modulus and internal effectiveness factor. A gradual reduction of catalyst surface area has been also observed for longer tests, due to the progressive deposition of soot from naphthalene decomposition over and inside the porous structure of the activated carbon. The carbon content of these deposits has been quantified, showing larger percentages on the surface of granules and powders.

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  • Parrillo, F. & Ruoppolo, G. & Arena, U., 2020. "The role of activated carbon size in the catalytic cracking of naphthalene," Energy, Elsevier, vol. 190(C).
    • Handle: RePEc:eee:energy:v:190:y:2020:i:c:s0360544219320808
    DOI: 10.1016/j.energy.2019.116385
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    References listed on IDEAS

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    Cited by:

    1. Parrillo, Francesco & Ardolino, Filomena & Calì, Gabriele & Marotto, Davide & Pettinau, Alberto & Arena, Umberto, 2021. "Fluidized bed gasification of eucalyptus chips: Axial profiles of syngas composition in a pilot scale reactor," Energy, Elsevier, vol. 219(C).
    2. Hu, Fan & Xiong, Biao & Huang, Xiaohong & Liu, Zhaohui, 2023. "Theoretical analysis and experimental verification of diminishing the diffusion influence on determination of char oxidation kinetics by thermo-gravimetric analysis," Energy, Elsevier, vol. 275(C).
    3. Ali Abdelaal & Vittoria Benedetti & Audrey Villot & Francesco Patuzzi & Claire Gerente & Marco Baratieri, 2023. "Innovative Pathways for the Valorization of Biomass Gasification Char: A Systematic Review," Energies, MDPI, vol. 16(10), pages 1-24, May.

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