English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/212517
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Exportar a otros formatos:

Title

Effect of gold electronic state on the catalytic performance of nano gold catalysts in n-Octanol Oxidation

AuthorsPakrieva, Ekaterina; Kolobova, Ekaterina; Kotolevich, Yulia; Pascual, Laura ; Carabineiro, Sónia A. C.; Kharlanov, Andrey N.; Pichugina, Daria; Nikitina, Nadezhda; German, Dmitrii; Zepeda Partida, Trino A.; Tiznado Vazquez, Hugo J.; Farías, Mario H.; Bogdanchikova, Nina; Cortés Corberán, Vicente ; Pestryakov, Alexey
Keywordsgold catalysts
n-octanol oxidation
gold active sites
gold electronic state
support modifiers
metal content
pretreatment atmosphere
DFT
solvent adsorption
acid-base centers
selectivity
Issue Date2-May-2020
PublisherMultidisciplinary Digital Publishing Institute
CitationNanomaterials 10(5): 880 (2020)
AbstractThis study aims to identify the role of the various electronic states of gold in the catalytic behavior of Au/MxOy/TiO2 (where MxOy are Fe2O3 or MgO) for the liquid phase oxidation of n-octanol, under mild conditions. For this purpose, Au/MxOy/TiO2 catalysts were prepared by deposition-precipitation with urea, varying the gold content (0.5 or 4 wt.%) and pretreatment conditions (H2 or O2), and characterized by low temperature nitrogen adsorption-desorption, X-ray powder diffraction (XRD), energy dispersive spectroscopy (EDX), scanning transmission electron microscopy-high angle annular dark field (STEM HAADF), diffuse reflectance Fourier transform infrared (DRIFT) spectroscopy of CO adsorption, temperature-programmable desorption (TPD) of ammonia and carbon dioxide, and X-ray photoelectron spectroscopy (XPS). Three states of gold were identified on the surface of the catalysts, Au0, Au1+ and Au3+, and their ratio determined the catalysts performance. Based on a comparison of catalytic and spectroscopic results, it may be concluded that Au+ was the active site state, while Au0 had negative effect, due to a partial blocking of Au0 by solvent. Au3+ also inhibited the oxidation process, due to the strong adsorption of the solvent and/or water formed during the reaction. Density functional theory (DFT) simulations confirmed these suggestions. The dependence of selectivity on the ratio of Brønsted acid centers to Brønsted basic centers was revealed.
Publisher version (URL)https://doi.org/10.3390/nano10050880
URIhttp://hdl.handle.net/10261/212517
DOIhttp://dx.doi.org/10.3390/nano10050880
E-ISSN2079-4991
Appears in Collections:(ICP) Artículos
Files in This Item:
File Description SizeFormat 
gold_electronic_n-Octanol_oxidation.pdf6,38 MBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.