Low temperature oxidation of carbon monoxide over alkali-metal promoted palladium-tin oxide catalysts


MİRKELAMOĞLU B., KARAKAŞ G.

NATO Advanced Research Workshop on Surface Chemistry in Biomedical and Environmental Science, Kiev, Ukraine, 14 - 17 September 2005, vol.228, pp.359-361 identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 228
  • Doi Number: 10.1007/1-4020-4741-x_32
  • City: Kiev
  • Country: Ukraine
  • Page Numbers: pp.359-361

Abstract

The CO oxidation activity of sol-gel prepared tin dioxide based palladium and sodium-palladium promoted catalysts were investigated by XRD, XPS, DRIFTS and temperature programmed desorption techniques. XPS data suggests that alkali-metal promotion results in the formation of super-oxide species and promotes the surface segregation of Pd atoms, increasing the number of active sites for CO adsorption/oxidation. The formation of a ternary oxide of sodium and palladium is Postulated. Through sub-ambient TPD experiments, the noble metal promoted catalysts have been identified to exhibit CO oxidation activity below ambient temperature. Steady-state CO conversion and rate of reaction data revealed that improvements in the CO oxidation activity of palladized tin dioxide could be achieved under both oxygen-rich and oxygen-lean conditions by sodium-promotion of the catalyst.