Electrical and catalytic properties of cerium-tin mixed oxides in CO depollution reaction

Anca Vasile, Veronica Bratan, Cristian Hornoiu, Monica Caldararu, Niculae I. Ionescu, Tatiana Yuzhakova, Ákos Rédey

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

AC electrical conductivity of CeO2 catalyst samples containing 5, 10 and 20wt% SnO2 prepared by co-precipitation and of SnO2 and CeO2 pure oxides (prepared under the same conditions) was measured in operando conditions. The measurements were carried out at a frequency of 1592Hz in the temperature range from room temperature up to 400°C, using successively programmed heating-cooling cycles under various atmospheres. The catalyst samples were tested in the catalytic oxidation of CO in presence and in absence of oxygen in the same temperature range (30-400°C). An improved deep oxidation of carbon monoxide has been found with these co-precipitated mixed oxides compared to pure components, leading to a better catalytic activity at lower temperature. The band gap energies were estimated based on the UV-Vis spectra and correlated with XRD results and AC electrical conductivity data. These results show the influence of the tin oxide on the electrical properties and oxygen mobility of the catalytic systems studied and on the surface behaviour of ceria.

Original languageEnglish
Pages (from-to)25-31
Number of pages7
JournalApplied Catalysis B: Environmental
Volume140-141
DOIs
Publication statusPublished - Aug 1 2013

Keywords

  • CO oxidation
  • Electrical conductivity
  • Surface dynamics
  • Tin-cerium mixed oxides catalysts

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

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