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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

  • Gabriella Garbarino
  • Tullio Cavattoni
  • Paola RianiEmail author
  • Rosaria Brescia
  • Fabio Canepa
  • Guido Busca
Article
  • 13 Downloads

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.

Graphical Abstract

Keywords

Ethanol steam reforming Bimetallic nanoparticles Cobalt Nickel Heterogeneous catalysts 

Notes

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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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Dipartimento di Ingegneria Civile, Chimica e Ambientale (DICCA), Laboratorio di Chimica Delle Superfici e CatalisiUniversità Degli Studi di GenovaGenovaItaly
  2. 2.INSTM, UdR GenovaGenovaItaly
  3. 3.Dipartimento di Chimica e Chimica Industriale (DCCI)Università Degli Studi di GenovaGenovaItaly
  4. 4.Dipartimento di Farmacia (DIFAR)Università Degli Studi di GenovaGenovaItaly
  5. 5.Electron Microscopy FacilityIstituto Italiano di Tecnologia (IIT)GenovaItaly

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