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Open AccessFeature PaperArticle

Selective Oxidation of Veratryl Alcohol over Au-Pd/Ce0.62Zr0.38O2 Catalysts Synthesized by Sol-Immobilization: Effect of Au:Pd Molar Ratio

1
Departamento de Ciencia de los Materiales, Ingeniería Metalúrgica y Química Inorgánica, Facultad de Ciencias, Universidad de Cádiz, Campus Río San Pedro, E-11510 Puerto Real (Cádiz), Spain
2
Dipartimento di Chimica, Università degli Studi di Milano, I-20133 Milano, Italy
*
Author to whom correspondence should be addressed.
Nanomaterials 2018, 8(9), 669; https://doi.org/10.3390/nano8090669
Received: 16 July 2018 / Revised: 10 August 2018 / Accepted: 24 August 2018 / Published: 28 August 2018
(This article belongs to the Special Issue Nanostructure Metal Alloys for the Transformation of Biomass)
The selective oxidation of veratryl alcohol (VA), a model compound of lignin, with oxygen molecules to produce veratraldehyde (VAld) was studied over monometallic Au, Pd, and bimetallic Au:Pd nanoparticles supported on a Ce0.62Zr0.38O2 mixed oxide for the first time. These bimetallic Au-Pd catalysts with Au:Pd molar ratios from 0.4 to 4.3 were synthesized by the sol-immobilization method. Furthermore, all the catalysts were characterized by inductively coupled plasma-atomic emission spectroscopy (ICP-AES), N2 physisorption, X-ray photoelectron spectroscopy (XPS), scanning transmission electron microscopy-high angle annular dark field (STEM-HAADF) imaging, energy dispersive X-ray spectroscopy (EDXS), and temperature programmed reduction (TPR) techniques. A synergistic effect between gold and palladium was observed over all the bimetallic catalysts in a wide range of studied Au:Pd ratios. Remarkably, the optimum Au:Pd ratio for this reaction was 1.4 with a turnover frequency of almost six times larger than for the monometallic gold and palladium catalysts. Selectivity to veratraldehyde was higher than 99% for the monometallic Au, Pd, and all the bimetallic Au-Pd catalysts, and stayed constant during the reaction time. View Full-Text
Keywords: veratryl alcohol oxidation; lignin; bimetallic Au-Pd catalyst; ceria-zirconia; Au:Pd molar ratio veratryl alcohol oxidation; lignin; bimetallic Au-Pd catalyst; ceria-zirconia; Au:Pd molar ratio
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Olmos, C.M.; Chinchilla, L.E.; Cappella, A.M.; Villa, A.; Delgado, J.J.; Hungría, A.B.; Blanco, G.; Calvino, J.J.; Prati, L.; Chen, X. Selective Oxidation of Veratryl Alcohol over Au-Pd/Ce0.62Zr0.38O2 Catalysts Synthesized by Sol-Immobilization: Effect of Au:Pd Molar Ratio. Nanomaterials 2018, 8, 669.

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