Effect of redox treatments on activation and deactivation of gold nanospecies supported on mesoporous silica in CO oxidation

N. Bogdanchikova, A. Pestryakov, I. Tuzovskaya, T. A. Zepeda, M. H. Farias, H. Tiznado, Oxana Anatolievna Martynyuk

Research output: Contribution to journalArticle

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Abstract

(Graph Presented) The influence of pretreatments with He, O2 and H2 on the physicochemical and catalytic properties of gold supported on hexagonal mesoporous silica (HMS) has been studied by a variety of methods including: XPS, TPR, N2 sorption, UV-visible spectroscopy, FTIR and catalytic testing. The investigations show supported gold to form different states under redox treatments: Au3+ and Au+ ions, neutral and partly charged gold clusters and metal nanoparticles of different sizes. Reducing pretreatments increase the catalytic activity of the samples; while oxidative treatments deactivate the catalyst. Catalytic tests show several regions of the reduced samples with various catalytic behaviours: 20-200°C, 200-400°C and >400°C; this situation is explained by the co-existence of gold active sites of different types. A comparative analysis among spectroscopic and catalytic data allows suggesting Audn δ+ clusters to be responsible for the activity in the low-temperature region (<200°C); neutral Aun clusters are active in the range 200-400°C; and gold nanoparticles may catalyze high-temperature CO oxidation. Au3+ ions are inactive in this process.

Original languageEnglish
Pages (from-to)40-47
Number of pages8
JournalFuel
Volume110
DOIs
Publication statusPublished - 2013

Fingerprint

Carbon Monoxide
Silicon Dioxide
Gold
Chemical activation
Silica
Oxidation
Ions
Spectroscopic analysis
Thermooxidation
Metal nanoparticles
Sorption
Catalyst activity
X ray photoelectron spectroscopy
Oxidation-Reduction
Spectroscopy
Nanoparticles
Catalysts
Testing
Temperature

Keywords

  • Clusters
  • CO oxidation
  • Gold
  • Nanoparticles
  • Silica

ASJC Scopus subject areas

  • Fuel Technology
  • Energy Engineering and Power Technology
  • Chemical Engineering(all)
  • Organic Chemistry

Cite this

Effect of redox treatments on activation and deactivation of gold nanospecies supported on mesoporous silica in CO oxidation. / Bogdanchikova, N.; Pestryakov, A.; Tuzovskaya, I.; Zepeda, T. A.; Farias, M. H.; Tiznado, H.; Martynyuk, Oxana Anatolievna.

In: Fuel, Vol. 110, 2013, p. 40-47.

Research output: Contribution to journalArticle

Bogdanchikova, N. ; Pestryakov, A. ; Tuzovskaya, I. ; Zepeda, T. A. ; Farias, M. H. ; Tiznado, H. ; Martynyuk, Oxana Anatolievna. / Effect of redox treatments on activation and deactivation of gold nanospecies supported on mesoporous silica in CO oxidation. In: Fuel. 2013 ; Vol. 110. pp. 40-47.
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