%0 Journal Article 
%A Olmos, Carol M.
%A Chinchilla Reyes, Lidia Esther
%A Villa, Alberto
%A Delgado Jaén, Juan José
%A Hungría Hernández, Ana Belén
%A Blanco Montilla, Ginesa
%A Calvino Gámez, José Juan
%A Prati, Laura
%A Chen, Xiaowei
%T Selective Oxidation of Veratryl Alcohol over Au-Pd/Ce0.62Zr0.38O2 Catalysts Synthesized by Sol-Immobilization: Effect of Au:Pd Molar Ratio
%D 2018
%@ 2079-4991
%U http://hdl.handle.net/10498/30003
%X 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.
%K Veratryl alcohol oxidation
%K lignin
%K bimetallic Au-Pd catalyst
%K ceria-zirconia
%K Au:Pd molar ratio
%~ Universidad de Cádiz