Abstract
Background: In comparison with these platinum group metal catalysts, supported nano gold catalysts have emerged as a new type of catalysts highly active at low temperature and selective for the aerobic oxidation of alcohols. But catalytic data and detailed characterizations of the Au-Ag bimetal catalytic system are not available up to date. Objective: This work is aimed to develop bimetallic AuAg-based heterogeneous catalysts for liquid phase selective oxidation of n-octanol. Modification of the titania support with transition metal additives were used as tools for transforming active species. Method: Catalytic tests in n-octanol liquid-phase oxidation at 80 °C. Catalyst characterization by Transmission electron microscopy, X-ray diffraction, plasma atomic emission spectroscopy, X-ray photoelectron spectroscopy, EXAFS and UV-visible spectroscopy. Results and Conclusion: Bimetallic AuAg catalysts supported on titania are moderately active for liquid phase selective oxidation of n-octanol. Formation of Au-Ag alloy was observed. Their activity may be increased by modification of the support with donor additives (La, Mg), while acceptor additives (Ce, Fe) decreased it. The addition of La, that inhibits the formation of Au-Ag alloy, provides the highest activity and the highest stability of reaction rate with run time in either as prepared and red-ox treated forms, which implies that it stabilizes the active centers in its optimal electronic state.
| Original language | English |
|---|---|
| Pages (from-to) | 323-331 |
| Number of pages | 9 |
| Journal | Current Organic Synthesis |
| Volume | 14 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 1 May 2017 |
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Keywords
- Au-Ag bimetal catalysts
- n-Octanol oxidation
- Redox treatment
- Support modification
ASJC Scopus subject areas
- Biochemistry
- Organic Chemistry
Cite this
Gold and silver catalysts for liquid phase n-octanol oxidation : Effect of promoters. / Kotolevich, Yulia; Kolobova, Ekaterina; Pestryakov, Alexey; Cabrera Ortega, Jesús Efrén; Bogdanchikova, Nina; Corberán, Vicente Cortés; Khramov, Evgeniy; Zubavichus, Yan; Zanella, Rodolfo; Pakrieva, Ekaterina.
In: Current Organic Synthesis, Vol. 14, No. 3, 01.05.2017, p. 323-331.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Gold and silver catalysts for liquid phase n-octanol oxidation
T2 - Effect of promoters
AU - Kotolevich, Yulia
AU - Kolobova, Ekaterina
AU - Pestryakov, Alexey
AU - Cabrera Ortega, Jesús Efrén
AU - Bogdanchikova, Nina
AU - Corberán, Vicente Cortés
AU - Khramov, Evgeniy
AU - Zubavichus, Yan
AU - Zanella, Rodolfo
AU - Pakrieva, Ekaterina
PY - 2017/5/1
Y1 - 2017/5/1
N2 - Background: In comparison with these platinum group metal catalysts, supported nano gold catalysts have emerged as a new type of catalysts highly active at low temperature and selective for the aerobic oxidation of alcohols. But catalytic data and detailed characterizations of the Au-Ag bimetal catalytic system are not available up to date. Objective: This work is aimed to develop bimetallic AuAg-based heterogeneous catalysts for liquid phase selective oxidation of n-octanol. Modification of the titania support with transition metal additives were used as tools for transforming active species. Method: Catalytic tests in n-octanol liquid-phase oxidation at 80 °C. Catalyst characterization by Transmission electron microscopy, X-ray diffraction, plasma atomic emission spectroscopy, X-ray photoelectron spectroscopy, EXAFS and UV-visible spectroscopy. Results and Conclusion: Bimetallic AuAg catalysts supported on titania are moderately active for liquid phase selective oxidation of n-octanol. Formation of Au-Ag alloy was observed. Their activity may be increased by modification of the support with donor additives (La, Mg), while acceptor additives (Ce, Fe) decreased it. The addition of La, that inhibits the formation of Au-Ag alloy, provides the highest activity and the highest stability of reaction rate with run time in either as prepared and red-ox treated forms, which implies that it stabilizes the active centers in its optimal electronic state.
AB - Background: In comparison with these platinum group metal catalysts, supported nano gold catalysts have emerged as a new type of catalysts highly active at low temperature and selective for the aerobic oxidation of alcohols. But catalytic data and detailed characterizations of the Au-Ag bimetal catalytic system are not available up to date. Objective: This work is aimed to develop bimetallic AuAg-based heterogeneous catalysts for liquid phase selective oxidation of n-octanol. Modification of the titania support with transition metal additives were used as tools for transforming active species. Method: Catalytic tests in n-octanol liquid-phase oxidation at 80 °C. Catalyst characterization by Transmission electron microscopy, X-ray diffraction, plasma atomic emission spectroscopy, X-ray photoelectron spectroscopy, EXAFS and UV-visible spectroscopy. Results and Conclusion: Bimetallic AuAg catalysts supported on titania are moderately active for liquid phase selective oxidation of n-octanol. Formation of Au-Ag alloy was observed. Their activity may be increased by modification of the support with donor additives (La, Mg), while acceptor additives (Ce, Fe) decreased it. The addition of La, that inhibits the formation of Au-Ag alloy, provides the highest activity and the highest stability of reaction rate with run time in either as prepared and red-ox treated forms, which implies that it stabilizes the active centers in its optimal electronic state.
KW - Au-Ag bimetal catalysts
KW - n-Octanol oxidation
KW - Redox treatment
KW - Support modification
UR - http://www.scopus.com/inward/record.url?scp=85018512561&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85018512561&partnerID=8YFLogxK
U2 - 10.2174/1570179413666161031113854
DO - 10.2174/1570179413666161031113854
M3 - Article
VL - 14
SP - 323
EP - 331
JO - Current Organic Synthesis
JF - Current Organic Synthesis
SN - 1570-1794
IS - 3
ER -