Au/TiO<sub>2</sub> catalysts promoted with Fe and Mg for n-octanol oxidation under mild conditions

Abstract

This work aims to further the understanding of gold-based catalytic oxidation of n-octanol in liquid phase. Modification of catalysts with metal oxides additives (Fe or Mg) was used as a tool for transforming and stabilizing gold species. Structural, electronic and catalytic properties of gold catalysts were systematically investigated by means of DRS, H₂, CO FTIR, S_BET, EDS and SEM, HRTEM, SR-XRD, XANES, XPS and liquid phase n-octanol oxidation. Addition of modifiers affects Au electronic properties, but not the structural ones. Characterization results allow excluding Au³⁺ ions as candidates for active sites in n-octanol oxidation. In Au/Mg/TiO₂, gold exhibited more reduced states while in Au/Fe/TiO₂ gold was more oxidized; Au/TiO₂ for intermediate oxidized states was found. The proper balance of oxidation states in the gold surface of Au/Mg/TiO₂ can be responsible for its higher activity compared with Au/Fe/TiO₂ and Au/TiO₂ towards n-octanol oxidation. Finally our approach shed light on the nature of active sites for n-octanol oxidation on gold and furthers the development of green base-free catalytic oxidation of alcohols.

Original language	English
Journal	Catalysis Today
DOIs	https://doi.org/10.1016/j.cattod.2016.05.002
Publication status	Accepted/In press - 2 Jan 2016

Keywords

Gold catalysts
Gold electronic state
Modification with Mg and Fe oxides
n-Octanol oxidation

ASJC Scopus subject areas

Catalysis
Chemistry(all)

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10.1016/j.cattod.2016.05.002

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Kotolevich, Y., Kolobova, E. N., Mamontov, G., Khramov, E., Cabrera Ortega, J. E., Tiznado, H., Farías, M. H., Bogdanchikova, N., Zubavichus, Y., Mota-Morales, J. D., Cortés Corberán, V., Zanella, R., & Pestryakov, A. (Accepted/In press). Au/TiO₂ catalysts promoted with Fe and Mg for n-octanol oxidation under mild conditions. Catalysis Today. https://doi.org/10.1016/j.cattod.2016.05.002

Au/TiO₂ catalysts promoted with Fe and Mg for n-octanol oxidation under mild conditions. / Kotolevich, Y.; Kolobova, Ekaterina Nikolaevna; Mamontov, G.; Khramov, E.; Cabrera Ortega, J. E.; Tiznado, H.; Farías, M. H.; Bogdanchikova, N.; Zubavichus, Ya; Mota-Morales, J. D.; Cortés Corberán, V.; Zanella, R.; Pestryakov, A.

In: Catalysis Today, 02.01.2016.

Research output: Contribution to journal › Article › peer-review

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title = "Au/TiO2 catalysts promoted with Fe and Mg for n-octanol oxidation under mild conditions",

abstract = "This work aims to further the understanding of gold-based catalytic oxidation of n-octanol in liquid phase. Modification of catalysts with metal oxides additives (Fe or Mg) was used as a tool for transforming and stabilizing gold species. Structural, electronic and catalytic properties of gold catalysts were systematically investigated by means of DRS, H2, CO FTIR, SBET, EDS and SEM, HRTEM, SR-XRD, XANES, XPS and liquid phase n-octanol oxidation. Addition of modifiers affects Au electronic properties, but not the structural ones. Characterization results allow excluding Au3+ ions as candidates for active sites in n-octanol oxidation. In Au/Mg/TiO2, gold exhibited more reduced states while in Au/Fe/TiO2 gold was more oxidized; Au/TiO2 for intermediate oxidized states was found. The proper balance of oxidation states in the gold surface of Au/Mg/TiO2 can be responsible for its higher activity compared with Au/Fe/TiO2 and Au/TiO2 towards n-octanol oxidation. Finally our approach shed light on the nature of active sites for n-octanol oxidation on gold and furthers the development of green base-free catalytic oxidation of alcohols.",

keywords = "Gold catalysts, Gold electronic state, Modification with Mg and Fe oxides, n-Octanol oxidation",

author = "Y. Kotolevich and Kolobova, {Ekaterina Nikolaevna} and G. Mamontov and E. Khramov and {Cabrera Ortega}, {J. E.} and H. Tiznado and Far{\'i}as, {M. H.} and N. Bogdanchikova and Ya Zubavichus and Mota-Morales, {J. D.} and {Cort{\'e}s Corber{\'a}n}, V. and R. Zanella and A. Pestryakov",

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AU - Kotolevich, Y.

AU - Kolobova, Ekaterina Nikolaevna

AU - Mamontov, G.

AU - Khramov, E.

AU - Cabrera Ortega, J. E.

AU - Tiznado, H.

AU - Farías, M. H.

AU - Bogdanchikova, N.

AU - Zubavichus, Ya

AU - Mota-Morales, J. D.

AU - Cortés Corberán, V.

AU - Zanella, R.

AU - Pestryakov, A.

PY - 2016/1/2

Y1 - 2016/1/2

N2 - This work aims to further the understanding of gold-based catalytic oxidation of n-octanol in liquid phase. Modification of catalysts with metal oxides additives (Fe or Mg) was used as a tool for transforming and stabilizing gold species. Structural, electronic and catalytic properties of gold catalysts were systematically investigated by means of DRS, H2, CO FTIR, SBET, EDS and SEM, HRTEM, SR-XRD, XANES, XPS and liquid phase n-octanol oxidation. Addition of modifiers affects Au electronic properties, but not the structural ones. Characterization results allow excluding Au3+ ions as candidates for active sites in n-octanol oxidation. In Au/Mg/TiO2, gold exhibited more reduced states while in Au/Fe/TiO2 gold was more oxidized; Au/TiO2 for intermediate oxidized states was found. The proper balance of oxidation states in the gold surface of Au/Mg/TiO2 can be responsible for its higher activity compared with Au/Fe/TiO2 and Au/TiO2 towards n-octanol oxidation. Finally our approach shed light on the nature of active sites for n-octanol oxidation on gold and furthers the development of green base-free catalytic oxidation of alcohols.

AB - This work aims to further the understanding of gold-based catalytic oxidation of n-octanol in liquid phase. Modification of catalysts with metal oxides additives (Fe or Mg) was used as a tool for transforming and stabilizing gold species. Structural, electronic and catalytic properties of gold catalysts were systematically investigated by means of DRS, H2, CO FTIR, SBET, EDS and SEM, HRTEM, SR-XRD, XANES, XPS and liquid phase n-octanol oxidation. Addition of modifiers affects Au electronic properties, but not the structural ones. Characterization results allow excluding Au3+ ions as candidates for active sites in n-octanol oxidation. In Au/Mg/TiO2, gold exhibited more reduced states while in Au/Fe/TiO2 gold was more oxidized; Au/TiO2 for intermediate oxidized states was found. The proper balance of oxidation states in the gold surface of Au/Mg/TiO2 can be responsible for its higher activity compared with Au/Fe/TiO2 and Au/TiO2 towards n-octanol oxidation. Finally our approach shed light on the nature of active sites for n-octanol oxidation on gold and furthers the development of green base-free catalytic oxidation of alcohols.

KW - Gold catalysts

KW - Gold electronic state

KW - Modification with Mg and Fe oxides

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