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Effect of the Metal Deposition Order on Structural, Electronic and Catalytic Properties of TiO2-Supported Bimetallic Au-Ag Catalysts in 1-Octanol Selective Oxidation. Catalysts 2021. [DOI: 10.3390/catal11070799] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Au and Ag were deposited on TiO2 modified with Ce, La, Fe or Mg in order to obtain bimetallic catalysts to be used for liquid-phase oxidation of 1-octanol. The effects of the deposition order of gold and silver, and the nature of the support modifying additives and redox pretreatments on the catalytic properties of the bimetallic Au-Ag catalysts were studied. Catalysts were characterized by low-temperature nitrogen adsorption–desorption, energy dispersive spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy and ultraviolet-visible diffuse reflectance spectroscopy. It was found that pretreatments with hydrogen and oxygen at 300 °C significantly decreased the activity of AuAg catalysts (silver was deposited first) and had little effect on the catalytic properties of AgAu samples (gold was deposited first). The density functional theory method demonstrated that the adsorption energy of 1-octanol increased for all positively charged AuxAgyq (x + y = 10, with a charge of q = 0 or +1) clusters compared with the neutral counterparts. Lanthanum oxide was a very effective promoter for both monometallic and bimetallic gold and silver catalysts in the studied process.
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The Application of Copper-Gold Catalysts in the Selective Oxidation of Glycerol at Acid and Basic Conditions. Catalysts 2021. [DOI: 10.3390/catal11010094] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The crude glycerol is produced during the transesterification of animal fats and vegetable oils, but it is a by-product of this process. Currently, its elimination is a problem in the chemical industry. The main goal of this work was the preparation, characterization and application of mesoporous cerium-zirconium oxide as supports for copper and gold species and the comparison of selected factors on the properties of catalysts in glycerol oxidation in the liquid phase. The samples were characterized using adsorption and desorption of nitrogen, XRD, UV-vis, XPS, TEM, SEM, and STEM-EDXS. The obtained results of glycerol oxidation show that the bimetallic copper-gold catalysts are more active and selective to glyceric acid in this reaction than analogous monometallic gold catalysts. Additionally, bimetallic catalysts are also characterized by the catalytic stability, and their application leads to the increase of selectivity to glyceric acid during their reusing in glycerol oxidation in alkali media. In this work, the influence of selected factors, e.g., oxygen source and its pressure, solution pH, and base content on the catalytic activity of bimetallic catalysts is discussed.
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Selective oxidation of n-octanol on unmodified and La-modified nanogold catalysts: Effect of metal content. Catal Today 2019. [DOI: 10.1016/j.cattod.2018.04.046] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Pakrieva E, Kolobova E, Mamontov G, Bogdanchikova N, Farias MH, Pascual L, Cortés Corberán V, Martinez Gonzalez S, Carabineiro SAC, Pestryakov A. Green Oxidation ofn‐Octanol on Supported Nanogold Catalysts: Formation of Gold Active Sites under Combined Effect of Gold Content, Additive Nature and Redox Pretreatment. ChemCatChem 2019. [DOI: 10.1002/cctc.201801566] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- E. Pakrieva
- Research School of Chemistry & Applied Biomedical SciencesTomsk Polytechnic University Lenin Avenue 30 634050 Tomsk Russia
| | - E. Kolobova
- Research School of Chemistry & Applied Biomedical SciencesTomsk Polytechnic University Lenin Avenue 30 634050 Tomsk Russia
| | - G. Mamontov
- Tomsk State University Lenin Avenue 36 634050 Tomsk Russia
| | - N. Bogdanchikova
- Centro de Nanociencias y NanotecnologíaUNAM Post box 14 22860 Ensenada México
| | - M. H. Farias
- Centro de Nanociencias y NanotecnologíaUNAM Post box 14 22860 Ensenada México
| | - L. Pascual
- Institute of Catalysis and Petroleumchemistry (ICP)CSIC Marie Curie 2 28049 Madrid Spain
| | - V. Cortés Corberán
- Institute of Catalysis and Petroleumchemistry (ICP)CSIC Marie Curie 2 28049 Madrid Spain
| | - S. Martinez Gonzalez
- Institute of Catalysis and Petroleumchemistry (ICP)CSIC Marie Curie 2 28049 Madrid Spain
| | - S. A. C. Carabineiro
- Laboratório de Catálise e MateriaisDepartamento de Engenharia QuímicaFaculdade de EngenhariaUniversidade do Porto Rua Dr. Roberto Frias 4200-465 Porto Portugal
| | - A. Pestryakov
- Research School of Chemistry & Applied Biomedical SciencesTomsk Polytechnic University Lenin Avenue 30 634050 Tomsk Russia
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Fernández-Domene RM, Sánchez-Tovar R, Lucas-Granados B, Muñoz-Portero MJ, Ramírez-Grau R, García-Antón J. Visible-light photoelectrodegradation of diuron on WO 3 nanostructures. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2018; 226:249-255. [PMID: 30121460 DOI: 10.1016/j.jenvman.2018.08.044] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 07/18/2018] [Accepted: 08/08/2018] [Indexed: 06/08/2023]
Abstract
The degradation of pesticide diuron has been explored by photoelectrocatalysis (PEC) under visible light illumination using two different WO3 nanostructures, obtained by anodization of tungsten. The highest degradation efficiency (73%) was obtained for WO3 nanosheets synthesized in the presence of small amounts of hydrogen peroxide (0.05 M). For that nanostructure, the kinetic coefficient for diuron degradation was 133% higher than that for the other nanostructure (anodized in the presence of fluoride anions). These results have been explained by taking into account the different architecture and dimensions of the two WO3 nanostructures under study.
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Affiliation(s)
- R M Fernández-Domene
- Ingeniería Electroquímica y Corrosión (IEC), Departamento de Ingeniería Química y Nuclear, ETSI Industriales, Universitat Politècnica de València, Camino de Vera s/n, 46022, Valencia, Spain
| | - R Sánchez-Tovar
- Ingeniería Electroquímica y Corrosión (IEC), Departamento de Ingeniería Química y Nuclear, ETSI Industriales, Universitat Politècnica de València, Camino de Vera s/n, 46022, Valencia, Spain
| | - B Lucas-Granados
- Ingeniería Electroquímica y Corrosión (IEC), Departamento de Ingeniería Química y Nuclear, ETSI Industriales, Universitat Politècnica de València, Camino de Vera s/n, 46022, Valencia, Spain
| | - M J Muñoz-Portero
- Ingeniería Electroquímica y Corrosión (IEC), Departamento de Ingeniería Química y Nuclear, ETSI Industriales, Universitat Politècnica de València, Camino de Vera s/n, 46022, Valencia, Spain
| | - R Ramírez-Grau
- Ingeniería Electroquímica y Corrosión (IEC), Departamento de Ingeniería Química y Nuclear, ETSI Industriales, Universitat Politècnica de València, Camino de Vera s/n, 46022, Valencia, Spain
| | - J García-Antón
- Ingeniería Electroquímica y Corrosión (IEC), Departamento de Ingeniería Química y Nuclear, ETSI Industriales, Universitat Politècnica de València, Camino de Vera s/n, 46022, Valencia, Spain.
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Effect of the Chemical Composition of Mesoporous Cerium-Zirconium Oxides on the Modification with Sulfur and Gold Species and Their Application in Glycerol Oxidation. CHEMENGINEERING 2017. [DOI: 10.3390/chemengineering1020018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Jin B, Wei Y, Zhao Z, Liu J, Li Y, Li R, Duan A, Jiang G. Three-dimensionally ordered macroporous CeO 2 /Al 2 O 3 -supported Au nanoparticle catalysts: Effects of CeO 2 nanolayers on catalytic activity in soot oxidation. CHINESE JOURNAL OF CATALYSIS 2017. [DOI: 10.1016/s1872-2067(17)62798-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Application of microwave irradiation in preparation and characterization of CuO/Al 2 O 3 nanocomposite for removing MB dye from aqueous solution. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2017.03.038] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Effects of Au–Ce strong interactions on catalytic activity of Au/CeO2/3DOM Al2O3 catalyst for soot combustion under loose contact conditions. CHINESE JOURNAL OF CATALYSIS 2016. [DOI: 10.1016/s1872-2067(15)61094-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Hydroxylated sol–gel Al2O3 as photocatalyst for the degradation of phenolic compounds in presence of UV light. Catal Today 2014. [DOI: 10.1016/j.cattod.2013.10.027] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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