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Role of CO 2 on CO preferential oxidation over CuO/CeO 2 catalyst

Applied Catalysis B: Environmental, ISSN: 0926-3373, Vol: 142, Page: 169-177
2013
  • 66
    Citations
  • 0
    Usage
  • 46
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    66
    • Citation Indexes
      66
  • Captures
    46

Article Description

The inhibiting effect of the presence of CO 2 (15 vol.%) in the reaction mixture of CO-PROX reaction on the performance of CuO/CeO 2 catalysts has been investigated; CO 2 depresses CO oxidation up to 160 °C, its effect being negligible at higher temperatures. The CO 2 coverage of both ceria support and catalysts has been quantitatively determined by CO 2 TPD experiments and the distribution of adsorbing sites has been modeled. Two sites for CeO 2 (one modified by the strong interaction between Ce and Cu when copper is added) and an additional site associated to less interacting copper for CuO/CeO 2 catalysts have been identified by the mathematical model. Although ceria gives a large contribution to CO 2 adsorption, the sites present in larger amount rapidly desorb CO 2 in the typical temperature range of CO-PROX reaction (80–150 °C), especially when copper modification induces a decrease of desorption activation energy, thus suggesting that these centres are involved in CO oxidation. Adsorption sites attributed to copper less interacting with the support still keep a fraction of adsorbed CO 2 in this temperature range and the higher selectivity suggested that they can be mainly related to the H 2 oxidation activity.

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