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

Authors :
Olmos, Carol M.
Chinchilla, Lidia E.
Cappella, Andrea M.
Villa, Alberto
Delgado, Juan J.
HungrĂ­a, Ana B.
Blanco, Ginesa
Calvino, Jose J.
Prati, Laura
Xiaowei Chen
Source :
Nanomaterials (2079-4991); Sep2018, Vol. 8 Issue 9, p669, 16p
Publication Year :
2018

Abstract

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 Ce<subscript>0.62</subscript>Zr<subscript>0.38</subscript>O<subscript>2</subscript> 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), N<subscript>2</subscript> 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. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
20794991
Volume :
8
Issue :
9
Database :
Complementary Index
Journal :
Nanomaterials (2079-4991)
Publication Type :
Academic Journal
Accession number :
131979228
Full Text :
https://doi.org/10.3390/nano8090669