Improved synthesis and hydrothermal stability of Pt/C catalysts based on size-controlled nanoparticles

Lemus J, Bedia J, Calvo L, Simakova IL, Murzin DY, Etzold BJ, Rodriguez JJ, Gilarranz MA (2016)

Publication Type: Journal article

Publication year: 2016

Journal

Catalysis: Science and Technology Royal Society of Chemistry

Book Volume: 6

Pages Range: 5196-5206

Journal Issue: 13

DOI: 10.1039/c6cy00403b

Abstract

A novel method for the preparation of stable Pt/C catalysts with size-controlled nanoparticles has been developed. The method is based on in situ synthesis of the nanoparticles (reduction with NaBH4 in the presence of a support and PVP). Compared to the conventional ex situ route (colloidal synthesis followed by impregnation), this in situ route yields smaller nanoparticles (2.5-3.9 nm) of narrower size distribution. The catalysts prepared by the in situ synthesis showed a higher stability in water at 80 °C, indicating a stronger interaction between the support and the metallic phase. Hydrothermal stability tests were also conducted under conditions equivalent to those of aqueous phase reforming (200 °C, 17 bar and water and diluted acetic acid). Hydrothermal treatment proved to be an excellent method to improve the resistance to leaching of the catalysts. Metal loss was negligible while PVP was almost completely removed from the catalyst; hence, most of the porosity was recovered and the dispersion measured by CO chemisorption increased from 5 to 34-75%. Water at 200 °C was more effective than diluted acetic acid for the removal of PVP. TEM images confirmed that the Pt nanoparticles did not undergo significant changes either in size or morphology upon the hydrothermal treatment, and XPS analysis showed a homogeneous distribution of Pt nanoparticles within the catalyst granules.

Authors with CRIS profile

Bastian Etzold

Involved external institutions

Universidad Autónoma de Madrid (UAM) ES Spain (ES) Åbo Akademi University FI Finland (FI) Boreskov Institute of Catalysis / Институт катализа им. Г.К. Борескова RU Russian Federation (RU) Technische Universität Darmstadt DE Germany (DE)

How to cite

APA:

Lemus, J., Bedia, J., Calvo, L., Simakova, I.L., Murzin, D.Y., Etzold, B.J.,... Gilarranz, M.A. (2016). Improved synthesis and hydrothermal stability of Pt/C catalysts based on size-controlled nanoparticles. Catalysis: Science and Technology, 6(13), 5196-5206. https://doi.org/10.1039/c6cy00403b

MLA:

Lemus, J., et al. "Improved synthesis and hydrothermal stability of Pt/C catalysts based on size-controlled nanoparticles." Catalysis: Science and Technology 6.13 (2016): 5196-5206.

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