Green Oxidation of n-octanol on Supported Nanogold Catalysts: Formation of Gold Active Sites under Combined Effect of Gold Content, Additive Nature and Redox Pretreatment

E. Pakrieva, E. Kolobova, G. Mamontov, N. Bogdanchikova, M. H. Farias, L. Pascual, V. Cortés Corberán, S. Martinez Gonzalez, S. A.C. Carabineiro, A. Pestryakov

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The combined influence of gold content (0.5 or 4 wt. %), modifying additives (La or Ce oxides) and redox pretreatments (H 2 or O 2 ) on catalytic properties and formation of active sites of Au/TiO 2 in the selective oxidation of n-octanol under mild conditions was studied. Samples were characterized by BET, XRD, EDX, ICP, TEM, STEM-HAADF, CO 2 -TPD, H2-TPR and XPS methods. The order of catalytic activity depended on the support nature for all treated samples, as follows: Au/La 2 O 3 /TiO 2 >Au/CeO 2 /TiO 2 >Au/TiO 2 . The catalytic activity enhanced with the increase of gold loading in the samples with hydrogen pretreatment, while after the oxidative pretreatment of the catalysts the opposite dependence of the activity with the gold content was found. This catalytic behavior was explained by a change in the surface concentration of monovalent gold ions, which seemed to be the active sites. The most active catalyst, 0.5 % Au/La 2 O 3 /TiO 2 , pretreated in oxidative atmosphere, had the highest surface concentration of monovalent gold ions.

Original languageEnglish
JournalChemCatChem
DOIs
Publication statusPublished - 1 Jan 2019

Fingerprint

1-Octanol
Catalyst supports
Gold
pretreatment
gold
catalysts
Oxidation
oxidation
catalytic activity
Catalyst activity
Ions
Catalysts
Carbon Monoxide
Temperature programmed desorption
Oxides
Energy dispersive spectroscopy
Hydrogen
ions
X ray photoelectron spectroscopy
Oxidation-Reduction

Keywords

  • effect of pretreatments
  • gold catalyst active sites
  • gold loading
  • n-octanol selective oxidation
  • support modifiers

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

Cite this

Green Oxidation of n-octanol on Supported Nanogold Catalysts : Formation of Gold Active Sites under Combined Effect of Gold Content, Additive Nature and Redox Pretreatment. / Pakrieva, E.; Kolobova, E.; Mamontov, G.; Bogdanchikova, N.; Farias, M. H.; Pascual, L.; Cortés Corberán, V.; Martinez Gonzalez, S.; Carabineiro, S. A.C.; Pestryakov, A.

In: ChemCatChem, 01.01.2019.

Research output: Contribution to journalArticle

@article{4a70dbb7a6f84efba2cdcddccab219d9,
title = "Green Oxidation of n-octanol on Supported Nanogold Catalysts: Formation of Gold Active Sites under Combined Effect of Gold Content, Additive Nature and Redox Pretreatment",
abstract = "The combined influence of gold content (0.5 or 4 wt. {\%}), modifying additives (La or Ce oxides) and redox pretreatments (H 2 or O 2 ) on catalytic properties and formation of active sites of Au/TiO 2 in the selective oxidation of n-octanol under mild conditions was studied. Samples were characterized by BET, XRD, EDX, ICP, TEM, STEM-HAADF, CO 2 -TPD, H2-TPR and XPS methods. The order of catalytic activity depended on the support nature for all treated samples, as follows: Au/La 2 O 3 /TiO 2 >Au/CeO 2 /TiO 2 >Au/TiO 2 . The catalytic activity enhanced with the increase of gold loading in the samples with hydrogen pretreatment, while after the oxidative pretreatment of the catalysts the opposite dependence of the activity with the gold content was found. This catalytic behavior was explained by a change in the surface concentration of monovalent gold ions, which seemed to be the active sites. The most active catalyst, 0.5 {\%} Au/La 2 O 3 /TiO 2 , pretreated in oxidative atmosphere, had the highest surface concentration of monovalent gold ions.",
keywords = "effect of pretreatments, gold catalyst active sites, gold loading, n-octanol selective oxidation, support modifiers",
author = "E. Pakrieva and E. Kolobova and G. Mamontov and N. Bogdanchikova and Farias, {M. H.} and L. Pascual and {Cort{\'e}s Corber{\'a}n}, V. and {Martinez Gonzalez}, S. and Carabineiro, {S. A.C.} and A. Pestryakov",
year = "2019",
month = "1",
day = "1",
doi = "10.1002/cctc.201801566",
language = "English",
journal = "ChemCatChem",
issn = "1867-3880",
publisher = "Wiley - VCH Verlag GmbH & CO. KGaA",

}

TY - JOUR

T1 - Green Oxidation of n-octanol on Supported Nanogold Catalysts

T2 - Formation of Gold Active Sites under Combined Effect of Gold Content, Additive Nature and Redox Pretreatment

AU - Pakrieva, E.

AU - Kolobova, E.

AU - Mamontov, G.

AU - Bogdanchikova, N.

AU - Farias, M. H.

AU - Pascual, L.

AU - Cortés Corberán, V.

AU - Martinez Gonzalez, S.

AU - Carabineiro, S. A.C.

AU - Pestryakov, A.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - The combined influence of gold content (0.5 or 4 wt. %), modifying additives (La or Ce oxides) and redox pretreatments (H 2 or O 2 ) on catalytic properties and formation of active sites of Au/TiO 2 in the selective oxidation of n-octanol under mild conditions was studied. Samples were characterized by BET, XRD, EDX, ICP, TEM, STEM-HAADF, CO 2 -TPD, H2-TPR and XPS methods. The order of catalytic activity depended on the support nature for all treated samples, as follows: Au/La 2 O 3 /TiO 2 >Au/CeO 2 /TiO 2 >Au/TiO 2 . The catalytic activity enhanced with the increase of gold loading in the samples with hydrogen pretreatment, while after the oxidative pretreatment of the catalysts the opposite dependence of the activity with the gold content was found. This catalytic behavior was explained by a change in the surface concentration of monovalent gold ions, which seemed to be the active sites. The most active catalyst, 0.5 % Au/La 2 O 3 /TiO 2 , pretreated in oxidative atmosphere, had the highest surface concentration of monovalent gold ions.

AB - The combined influence of gold content (0.5 or 4 wt. %), modifying additives (La or Ce oxides) and redox pretreatments (H 2 or O 2 ) on catalytic properties and formation of active sites of Au/TiO 2 in the selective oxidation of n-octanol under mild conditions was studied. Samples were characterized by BET, XRD, EDX, ICP, TEM, STEM-HAADF, CO 2 -TPD, H2-TPR and XPS methods. The order of catalytic activity depended on the support nature for all treated samples, as follows: Au/La 2 O 3 /TiO 2 >Au/CeO 2 /TiO 2 >Au/TiO 2 . The catalytic activity enhanced with the increase of gold loading in the samples with hydrogen pretreatment, while after the oxidative pretreatment of the catalysts the opposite dependence of the activity with the gold content was found. This catalytic behavior was explained by a change in the surface concentration of monovalent gold ions, which seemed to be the active sites. The most active catalyst, 0.5 % Au/La 2 O 3 /TiO 2 , pretreated in oxidative atmosphere, had the highest surface concentration of monovalent gold ions.

KW - effect of pretreatments

KW - gold catalyst active sites

KW - gold loading

KW - n-octanol selective oxidation

KW - support modifiers

UR - http://www.scopus.com/inward/record.url?scp=85061508919&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85061508919&partnerID=8YFLogxK

U2 - 10.1002/cctc.201801566

DO - 10.1002/cctc.201801566

M3 - Article

AN - SCOPUS:85061508919

JO - ChemCatChem

JF - ChemCatChem

SN - 1867-3880

ER -