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

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

Risultato della ricerca: Article

31 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 catalyticperformances 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 CO2was also evaluated.Characterizations by SAXS, XRD, STEM and XPS were carried out on selected spent catalysts after COoxidation.The results were discussed in terms of relationship between morphological, structural, electronic andcatalytic properties as a function of the ceria loading. The CO oxidation activity was strongly affected bygold 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 againstsintering. The optimum of the catalytic performances was found for 20 wt% ceria loading, likely due tothe optimum synergistic interaction between highly dispersed defective ceria oxide and nanosized gold.
Lingua originaleEnglish
Numero di pagine10
RivistaDefault journal
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; Venezia, Anna Maria; Pantaleo, Giuseppe; Liotta, Leonarda F.

In: Default journal, Vol. 187, 2012.

Risultato della ricerca: Article

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title = "Au/CeO2-SBA-15 catalysts for CO oxidation: effect of ceria loading on physic-chemical properties and catalytic performances",
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 catalyticperformances 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 CO2was also evaluated.Characterizations by SAXS, XRD, STEM and XPS were carried out on selected spent catalysts after COoxidation.The results were discussed in terms of relationship between morphological, structural, electronic andcatalytic properties as a function of the ceria loading. The CO oxidation activity was strongly affected bygold 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 againstsintering. The optimum of the catalytic performances was found for 20 wt{\%} ceria loading, likely due tothe optimum synergistic interaction between highly dispersed defective ceria oxide and nanosized gold.",
keywords = "Au, CO oxidation, CeO2, SBA-15, catalysts",
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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 - Venezia, Anna Maria

AU - Pantaleo, Giuseppe

AU - Liotta, Leonarda F.

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 catalyticperformances 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 CO2was also evaluated.Characterizations by SAXS, XRD, STEM and XPS were carried out on selected spent catalysts after COoxidation.The results were discussed in terms of relationship between morphological, structural, electronic andcatalytic properties as a function of the ceria loading. The CO oxidation activity was strongly affected bygold 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 againstsintering. The optimum of the catalytic performances was found for 20 wt% ceria loading, likely due tothe 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 catalyticperformances 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 CO2was also evaluated.Characterizations by SAXS, XRD, STEM and XPS were carried out on selected spent catalysts after COoxidation.The results were discussed in terms of relationship between morphological, structural, electronic andcatalytic properties as a function of the ceria loading. The CO oxidation activity was strongly affected bygold 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 againstsintering. The optimum of the catalytic performances was found for 20 wt% ceria loading, likely due tothe optimum synergistic interaction between highly dispersed defective ceria oxide and nanosized gold.

KW - Au

KW - CO oxidation

KW - CeO2

KW - SBA-15

KW - catalysts

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

M3 - Article

VL - 187

JO - Default journal

JF - Default journal

ER -