Au/CeO2-SBA-15 catalysts for CO oxidation: effect of ceria loading on physic-chemical properties and catalytic performances

Fabrizio Puleo, Giuseppe Pantaleo, Leonarda F. Liotta, Anna Maria Venezia

Risultato della ricerca: Article

29 Citazioni (Scopus)

Abstract

In this work gold catalysts supported over SBA-15 with different CeO2 loadings (5–30 wt%) were prepared, characterized by N2 physisorption analyses, SAXS, XRD, STEM and XPS techniques and their catalytic performances were evaluated in the CO oxidation, chosen as reaction test. Over a selected catalyst, Au/CeO2(20 wt%)-SBA-15, the effect of CO2 and of the mixture (CO2 + H2O) on the CO conversion to CO2 was also evaluated. Characterizations by SAXS, XRD, STEM and XPS were carried out on selected spent catalysts after CO oxidation. The results were discussed in terms of relationship between morphological, structural, electronic and catalytic properties as a function of the ceria loading. The CO oxidation activity was strongly affected by gold particle size and gold/ceria interface as well. For gold catalysts supported on ceria-doped SBA-15, the oxygen vacancies in ceria likely act as nucleation sites for gold anchoring and stabilization against sintering. The optimum of the catalytic performances was found for 20 wt% ceria loading, likely due to the optimum synergistic interaction between highly dispersed defective ceria oxide and nanosized gold.
Lingua originaleEnglish
pagine (da-a)-
Numero di pagine10
RivistaCatalysis Today
Volume187
Stato di pubblicazionePublished - 2012

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Cerium compounds
Carbon Monoxide
Chemical properties
Gold
Physics
Oxidation
Catalysts
Catalyst supports
X ray photoelectron spectroscopy
Physisorption
Oxygen vacancies
Electronic properties
Oxides
SBA-15
Nucleation
Stabilization
Particle size

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

Cita questo

Au/CeO2-SBA-15 catalysts for CO oxidation: effect of ceria loading on physic-chemical properties and catalytic performances. / Puleo, Fabrizio; Pantaleo, Giuseppe; Liotta, Leonarda F.; Venezia, Anna Maria.

In: Catalysis Today, Vol. 187, 2012, pag. -.

Risultato della ricerca: Article

Puleo, Fabrizio ; Pantaleo, Giuseppe ; Liotta, Leonarda F. ; Venezia, Anna Maria. / Au/CeO2-SBA-15 catalysts for CO oxidation: effect of ceria loading on physic-chemical properties and catalytic performances. In: Catalysis Today. 2012 ; Vol. 187. pagg. -.
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abstract = "In this work gold catalysts supported over SBA-15 with different CeO2 loadings (5–30 wt{\%}) were prepared, characterized by N2 physisorption analyses, SAXS, XRD, STEM and XPS techniques and their catalytic performances were evaluated in the CO oxidation, chosen as reaction test. Over a selected catalyst, Au/CeO2(20 wt{\%})-SBA-15, the effect of CO2 and of the mixture (CO2 + H2O) on the CO conversion to CO2 was also evaluated. Characterizations by SAXS, XRD, STEM and XPS were carried out on selected spent catalysts after CO oxidation. The results were discussed in terms of relationship between morphological, structural, electronic and catalytic properties as a function of the ceria loading. The CO oxidation activity was strongly affected by gold particle size and gold/ceria interface as well. For gold catalysts supported on ceria-doped SBA-15, the oxygen vacancies in ceria likely act as nucleation sites for gold anchoring and stabilization against sintering. The optimum of the catalytic performances was found for 20 wt{\%} ceria loading, likely due to the optimum synergistic interaction between highly dispersed defective ceria oxide and nanosized gold.",
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T1 - Au/CeO2-SBA-15 catalysts for CO oxidation: effect of ceria loading on physic-chemical properties and catalytic performances

AU - Puleo, Fabrizio

AU - Pantaleo, Giuseppe

AU - Liotta, Leonarda F.

AU - Venezia, Anna Maria

PY - 2012

Y1 - 2012

N2 - In this work gold catalysts supported over SBA-15 with different CeO2 loadings (5–30 wt%) were prepared, characterized by N2 physisorption analyses, SAXS, XRD, STEM and XPS techniques and their catalytic performances were evaluated in the CO oxidation, chosen as reaction test. Over a selected catalyst, Au/CeO2(20 wt%)-SBA-15, the effect of CO2 and of the mixture (CO2 + H2O) on the CO conversion to CO2 was also evaluated. Characterizations by SAXS, XRD, STEM and XPS were carried out on selected spent catalysts after CO oxidation. The results were discussed in terms of relationship between morphological, structural, electronic and catalytic properties as a function of the ceria loading. The CO oxidation activity was strongly affected by gold particle size and gold/ceria interface as well. For gold catalysts supported on ceria-doped SBA-15, the oxygen vacancies in ceria likely act as nucleation sites for gold anchoring and stabilization against sintering. The optimum of the catalytic performances was found for 20 wt% ceria loading, likely due to the optimum synergistic interaction between highly dispersed defective ceria oxide and nanosized gold.

AB - In this work gold catalysts supported over SBA-15 with different CeO2 loadings (5–30 wt%) were prepared, characterized by N2 physisorption analyses, SAXS, XRD, STEM and XPS techniques and their catalytic performances were evaluated in the CO oxidation, chosen as reaction test. Over a selected catalyst, Au/CeO2(20 wt%)-SBA-15, the effect of CO2 and of the mixture (CO2 + H2O) on the CO conversion to CO2 was also evaluated. Characterizations by SAXS, XRD, STEM and XPS were carried out on selected spent catalysts after CO oxidation. The results were discussed in terms of relationship between morphological, structural, electronic and catalytic properties as a function of the ceria loading. The CO oxidation activity was strongly affected by gold particle size and gold/ceria interface as well. For gold catalysts supported on ceria-doped SBA-15, the oxygen vacancies in ceria likely act as nucleation sites for gold anchoring and stabilization against sintering. The optimum of the catalytic performances was found for 20 wt% ceria loading, likely due to the optimum synergistic interaction between highly dispersed defective ceria oxide and nanosized gold.

KW - Au, CeO2, SBA-15, catalysts, CO oxidation

UR - http://hdl.handle.net/10447/79826

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VL - 187

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JO - Catalysis Today

JF - Catalysis Today

SN - 0920-5861

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