Study of CuO-CeO2 catalysts supported on SiO2 on the low-temperature oxidation of CO

Julián Astudillo, Gonzalo Águila, Francisco Díaz, Sichem Guerrero, Paulo Araya

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28 Scopus citations

Abstract

A study was made on the effect of the Cu/Ce ratio and on the total load of both metals on the oxidation activity of CO with O2 using SiO2 as support. It was found that the optimum Cu/Ce ratio for a constant total load of 10% on silica (Aerosil 200) was 0.43 (w/w), which corresponded to a catalyst with 3% Cu and 7% Ce. For that ratio the highly dispersed CuO-CeO2 interface was maximized. The catalyst's activity increased with increasing the total Cu-Ce load, but it reached a maximum above which the activity kept constant due to a similar concentration of sites at the CuO-CeO2 interface. The higher surface area of the support led to a increase of CuO particles interacting with CeO2 and to a decrease of bulk CuO species not interacting with CeO2. The highly dispersed CuO-CeO2 interface was not affected by a higher available surface area explaining the similar activity in supports with different surface area.
Original languageAmerican English
Pages (from-to)169-176
Number of pages8
JournalApplied Catalysis A: General
Volume381
Issue number1-2
DOIs
StatePublished - 15 Jun 2010

Keywords

  • CeO 2
  • CO oxidation
  • CuO
  • SiO 2
  • Supported catalysts

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