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On the Role of Support in Metallic Heterogeneous Catalysis: A Study of Unsupported Nickel–Cobalt Alloy Nanoparticles in Ethanol Steam Reforming

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Abstract

(Co, Ni) bimetallic nanoparticles have been prepared by reducing Ni and Co chloride solutions with sodium borohydride. The obtained materials have been characterized as cast and/or after annealing by means of XRD, magnetic measurements, IR spectroscopy, FE-SEM and TEM microscopies. The resulting nanomaterials, originally amorphous, crystallize into the cubic structure cF4-Cu as homogeneous (Co, Ni) solid solution alloy and with the additional presence of Boron containing phases due to the residual preparation impurities. The bimetallic nanoparticles are active in ethanol conversion in the presence of steam. For low Boron catalysts, the addition of Nickel to Cobalt nanoparticles improves the catalytic activity in ethanol steam reforming allowing yields as high as 87% at 773 K, at high space velocities (GHSV 324,000 h−1). The performances of the catalytic unsupported nanoparticles with a Ni/Co atomic ratio equal to 0.26 appear to be better than those of conventional supported catalysts. The state of Boron impurities affect catalytic activity of bimetallic (Co, Ni) NPs. Carbonaceous materials, such as carbon nanotubes and graphitic carbon, form on the catalyst surface upon reaction.

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Acknowledgements

The collaboration of Elena Reghitto and Lea Pasquale during the preparation of their master theses is gratefully acknowledged.

Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Authors and Affiliations

  1. Dipartimento di Ingegneria Civile, Chimica e Ambientale (DICCA), Laboratorio di Chimica Delle Superfici e Catalisi, Università Degli Studi di Genova, Via all’Opera Pia 15, 16145, Genova, Italy

    Gabriella Garbarino & Guido Busca

  2. INSTM, UdR Genova, Via Dodecaneso, 31, 16146, Genova, Italy

    Gabriella Garbarino, Paola Riani & Guido Busca

  3. Dipartimento di Chimica e Chimica Industriale (DCCI), Università Degli Studi di Genova, Via Dodecaneso, 31, 16146, Genova, Italy

    Tullio Cavattoni & Fabio Canepa

  4. Dipartimento di Farmacia (DIFAR), Università Degli Studi di Genova, Viale Cembrano 4, 16148, Genova, Italy

    Paola Riani

  5. Electron Microscopy Facility, Istituto Italiano di Tecnologia (IIT), Via Morego 30, 16163, Genova, Italy

    Rosaria Brescia

Authors
  1. Gabriella Garbarino
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  2. Tullio Cavattoni
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  3. Paola Riani
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  4. Rosaria Brescia
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  5. Fabio Canepa
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  6. Guido Busca
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Corresponding author

Correspondence to Paola Riani.

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Garbarino, G., Cavattoni, T., Riani, P. et al. On the Role of Support in Metallic Heterogeneous Catalysis: A Study of Unsupported Nickel–Cobalt Alloy Nanoparticles in Ethanol Steam Reforming. Catal Lett 149, 929–941 (2019). https://doi.org/10.1007/s10562-019-02688-9

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  • DOI: https://doi.org/10.1007/s10562-019-02688-9

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