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• Gil, S
• Romero, A
• Lucas, A
• Sánchez, P
• Dorado, F
• Osa, A
• García-Vargas, J
• Valverde, J
• [+] on Google Scholar
• Gil, S
• Romero, A
• Lucas, A
• Sánchez, P
• Dorado, F
• Osa, A
• García-Vargas, J
• Valverde, J
• [+] on PubMed
• Gil, S
• Romero, A
• Lucas, A
• Sánchez, P
• Dorado, F
• Osa, A
• García-Vargas, J
• Valverde, J

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Catalysts 2011, 1(1), 155-174; doi:10.3390/catal1010155

Article

Nano-Scale Au Supported on Carbon Materials for the Low Temperature Water Gas Shift (WGS) Reaction

Sonia Gil ¹ , Amaya Romero ^2,* , Antonio de Lucas ¹ , Paula Sánchez ¹ , Fernando Dorado ¹ , Ana Raquel de la Osa ¹ , Jesús Manuel García-Vargas ¹  and Jose Luis Valverde ¹

¹ Catalysis Group, Department of Chemical Engineering, Faculty of Chemistry, University of Castilla-La Mancha, Av. Camilo José Cela 13071 Ciudad Real, Spain ² School of Technical Agricultural Engineer, University of Castilla-La Mancha, Av. Camilo José Cela 13071 Ciudad Real, Spain

* Author to whom correspondence should be addressed.

Received: 11 October 2011; in revised form: 4 November 2011 / Accepted: 29 November 2011 / Published: 9 December 2011

(This article belongs to the Special Issue Gold Catalysts)

Download PDF Full-Text [6721 KB, uploaded 9 December 2011 10:40 CET]

Abstract: Au-based catalysts supported on carbon materials with different structures such as graphite (G) and fishbone type carbon nanofibers (CNF-F) were prepared using two different methods (impregnation and gold-sol) to be tested in the water gas shift (WGS) reaction. Atomic absorption spectrometry, transmission electron microscopy (TEM), temperature-programmed oxidation (TPO), X-ray diffraction (XRD), Raman spectroscopy, elemental analyses (CNH), N₂ adsorption-desorption analysis, temperature-programmed reduction (TPR) and temperature-programmed decomposition were employed to characterize both the supports and catalysts. Both the crystalline nature of the carbon supports and the method of gold incorporation had a strong influence on the way in which Au particles were deposited on the carbon surface. The higher crystallinity and the smaller and well dispersed Au particle size were, the higher activity of the catalysts in the WGS reaction was noted. Finally, catalytic activity showed an important dependence on the reaction temperature and steam-to-CO molar ratio.

Keywords: graphite; carbon nanofibers; gold; WGS; CO; H₂

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