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New Insights into the Role of the Synthesis Procedure on the Performance of Co-Based Catalysts for Ethanol Steam Reforming

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Abstract

Co/SiO2 catalysts with two Co contents of 10 and 30 mol% were prepared and used in ethanol steam reforming. With the aim of tailoring the materials features by varying the synthesis parameters, two different sol–gel procedures were designed, namely a modified hydrolytic alkoxide sol–gel synthesis and a (non-ionic) surfactant assisted one. Effect of the synthesis procedure on the physico-chemical properties of the prepared catalysts is in the focus of the present investigation. The obtained Co/SiO2 catalysts were characterized by means of X-rays powder diffraction, diffuse reflectance UV–Vis spectroscopy, N2 adsorption/desorption isotherms at − 196 °C, field emission scanning electron microscopy equipped with energy dispersive X-ray probe, temperature-programmed reduction and CO adsorption at nominal − 196 °C as followed by IR spectroscopy. The oxidation state of Co species within the SiO2 matrix was affected by the synthesis method. In particular, the non-ionic surfactant, acting both as pores template and as chelating agent of Co ions during the synthesis, prevented the formation of Co3O4 phase leading to a higher dispersion and higher temperature reducibility of Co species with respect to samples with same Co content synthesized without surfactant. The fine balance between Co dispersion and reducibility was the fundamental parameter governing the activity of the Co/SiO2 catalysts in terms of H2 production, CO/CO2 ratio and C balance during ethanol steam reforming.

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Acknowledgements

Authors thank Dr. Mauro Raimondo (Politecnico di Torino, Italy) for FESEM measurements.

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Authors and Affiliations

  1. Dipartimento di Chimica, Università Degli Studi di Milano, INSTM Unit Milano-Università and CNR-ISTM, Via C. Golgi, 19, 20133, Milano, Italy

    Ilenia Rossetti & Elnaz Bahadori

  2. Dipartimento di Scienza Applicata e Tecnologia, Politecnico di Torino, INSTM Unit of Torino-Politecnico, Corso Duca degli Abruzzi 24, 10129, Torino, Italy

    Barbara Bonelli & Roberto Nasi

  3. Dipartimento di Ingegneria Civile, Chimica e Ambientale, Università degli Studi di Genova and INSTM Unit Genova, Via all’Opera Pia 15A, Genova, Italy

    Gianguido Ramis

  4. Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli Federico II, Piazzele Tecchio, 80, 80125, Napoli, Italy

    Antonio Aronne

  5. Dipartimento di Ingegneria Civile e Meccanica and INSTM Unit, Università degli Studi di Cassino e del Lazio Meridionale, Via G. Di Biasio 43, 03043, Cassino, Fr, Italy

    Serena Esposito

Authors
  1. Ilenia Rossetti
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  2. Barbara Bonelli
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  3. Gianguido Ramis
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  4. Elnaz Bahadori
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  5. Roberto Nasi
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  6. Antonio Aronne
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  7. Serena Esposito
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Correspondence to Serena Esposito.

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Rossetti, I., Bonelli, B., Ramis, G. et al. New Insights into the Role of the Synthesis Procedure on the Performance of Co-Based Catalysts for Ethanol Steam Reforming. Top Catal 61, 1734–1745 (2018). https://doi.org/10.1007/s11244-018-0969-3

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  • DOI: https://doi.org/10.1007/s11244-018-0969-3

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