Effect of the Metal Deposition Order on Structural, Electronic and Catalytic Properties of TiO2-Supported Bimetallic Au-Ag Catalysts in 1-Octanol Selective Oxidation
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 catalyt...
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| Veröffentlicht in: | Catalysts 2021-07, Vol.11 (7), p.799 |
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| creator | Kotolevich, Yulia Pakrieva, Ekaterina Kolobova, Ekaterina Farías, Mario H. Bogdanchikova, Nina Cortés Corberán, Vicente Pichugina, Daria Nikitina, Nadezhda Carabineiro, Sónia A. C. Pestryakov, Alexey |
| description | 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. |
| doi_str_mv | 10.3390/catal11070799 |
| format | Article |
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C. ; Pestryakov, Alexey</creator><creatorcontrib>Kotolevich, Yulia ; Pakrieva, Ekaterina ; Kolobova, Ekaterina ; Farías, Mario H. ; Bogdanchikova, Nina ; Cortés Corberán, Vicente ; Pichugina, Daria ; Nikitina, Nadezhda ; Carabineiro, Sónia A. C. ; Pestryakov, Alexey</creatorcontrib><description>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.</description><identifier>ISSN: 2073-4344</identifier><identifier>EISSN: 2073-4344</identifier><identifier>DOI: 10.3390/catal11070799</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Additives ; Adsorption ; Alloys ; Bimetals ; Catalysts ; Chemical reactions ; Density functional theory ; Deposition ; Gold ; High resolution electron microscopy ; Investigations ; Lanthanum ; Lanthanum oxides ; Liquid phase oxidation ; Liquid phases ; Low temperature ; Nanoparticles ; Octanol ; Particle size ; Photoelectrons ; Pretreatment ; Silver ; Spectrum analysis ; Titanium dioxide ; Ultraviolet reflection ; X ray photoelectron spectroscopy</subject><ispartof>Catalysts, 2021-07, Vol.11 (7), p.799</ispartof><rights>2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). 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C.</creatorcontrib><creatorcontrib>Pestryakov, Alexey</creatorcontrib><title>Effect of the Metal Deposition Order on Structural, Electronic and Catalytic Properties of TiO2-Supported Bimetallic Au-Ag Catalysts in 1-Octanol Selective Oxidation</title><title>Catalysts</title><description>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.</description><subject>Additives</subject><subject>Adsorption</subject><subject>Alloys</subject><subject>Bimetals</subject><subject>Catalysts</subject><subject>Chemical reactions</subject><subject>Density functional theory</subject><subject>Deposition</subject><subject>Gold</subject><subject>High resolution electron microscopy</subject><subject>Investigations</subject><subject>Lanthanum</subject><subject>Lanthanum oxides</subject><subject>Liquid phase oxidation</subject><subject>Liquid phases</subject><subject>Low temperature</subject><subject>Nanoparticles</subject><subject>Octanol</subject><subject>Particle size</subject><subject>Photoelectrons</subject><subject>Pretreatment</subject><subject>Silver</subject><subject>Spectrum analysis</subject><subject>Titanium dioxide</subject><subject>Ultraviolet reflection</subject><subject>X ray photoelectron spectroscopy</subject><issn>2073-4344</issn><issn>2073-4344</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNpVkctOwzAQRSMEElXpkr0ltgT8TrwspTykoiC1rCPHscFVGgfbQfSD-E8StQuYzdyR7j0z0iTJJYI3hAh4q2SUDUIwg5kQJ8kEw4yklFB6-kefJ7MQtnAogUiO2CT5WRqjVQTOgPihwYseKOBedy7YaF0LCl9rDwaxjr5XsfeyuQbLZoh411oFZFuDxbh6H4fp1btO-2h1GIEbW-B03Xed81HX4M7uRnoz-OZ9On8_5kIMwLYApYWKsnUNWOsRb780KL5tLcczLpIzI5ugZ8c-Td4elpvFU7oqHp8X81WqCKQxNZnQEBtloGIV5IzXjEFmGOckhxRzLmtS0TyHOasqIVFVo0xiiTGHFc1wRabJ1YHbeffZ6xDLret9O6wsMWOUcipyMbjSg0t5F4LXpuy83Um_LxEsx2eU_55BfgGcsX5Z</recordid><startdate>20210701</startdate><enddate>20210701</enddate><creator>Kotolevich, Yulia</creator><creator>Pakrieva, Ekaterina</creator><creator>Kolobova, Ekaterina</creator><creator>Farías, Mario H.</creator><creator>Bogdanchikova, Nina</creator><creator>Cortés Corberán, Vicente</creator><creator>Pichugina, Daria</creator><creator>Nikitina, Nadezhda</creator><creator>Carabineiro, Sónia A. 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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.</abstract><cop>Basel</cop><pub>MDPI AG</pub><doi>10.3390/catal11070799</doi><orcidid>https://orcid.org/0000-0002-2842-2542</orcidid><orcidid>https://orcid.org/0000-0001-9913-4671</orcidid><orcidid>https://orcid.org/0000-0002-2877-3684</orcidid><orcidid>https://orcid.org/0000-0002-9034-4733</orcidid><orcidid>https://orcid.org/0000-0002-5150-6787</orcidid><orcidid>https://orcid.org/0000-0001-7479-215X</orcidid><orcidid>https://orcid.org/0000-0003-0929-3535</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Additives Adsorption Alloys Bimetals Catalysts Chemical reactions Density functional theory Deposition Gold High resolution electron microscopy Investigations Lanthanum Lanthanum oxides Liquid phase oxidation Liquid phases Low temperature Nanoparticles Octanol Particle size Photoelectrons Pretreatment Silver Spectrum analysis Titanium dioxide Ultraviolet reflection X ray photoelectron spectroscopy |
| title | Effect of the Metal Deposition Order on Structural, Electronic and Catalytic Properties of TiO2-Supported Bimetallic Au-Ag Catalysts in 1-Octanol Selective Oxidation |
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