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Light-off performance over cobalt oxide- and ceria-promoted platinum and palladium catalysts

Magnus Skoglundh (Institutionen för teknisk kemi ; Kompetenscentrum katalys (KCK)) ; Anders Törncrona (Institutionen för teknisk kemi ; Kompetenscentrum katalys (KCK)) ; Peter Thormählen (Institutionen för kemisk reaktionsteknik ; Institutionen för teknisk fysik, Kemisk fysik ; Kompetenscentrum katalys (KCK)) ; Erik Fridell (Institutionen för teknisk fysik, Kemisk fysik ; Kompetenscentrum katalys (KCK)) ; Astrid Drewsen (Institutionen för kemisk reaktionsteknik ; Kompetenscentrum katalys (KCK)) ; Edward Jobson (Kompetenscentrum katalys (KCK))
Studies in Surface Science and Catalysis (0167-2991). Vol. 116 (1998), p. 113-122.
[Artikel, refereegranskad vetenskaplig]

Monolith catalysts containing Co, Ce, Pt and Pd supported on alumina were prepared and tested with respect to low-temperature activity for oxidation of CO and propene. The catalysts were either pre-oxidised or pre-reduced prior to evaluation with respect to light-off performance, using net oxidising and net reducing CO/C3H6/O2/N2 gas mixtures. Promotion of Pt and Pd with cobalt or cerium oxide, favoured the low temperature activity significantly. Pre-reduction of Co- and Ce-promoted noble metals shifted the conversion starts of CO and propene toward lower temperatures compared with pre-oxidised samples. Pre-reduction of cobalt oxide, without Pt or Pd, yielded a dramatic improvement of the low-temperature catalytic performance compared with pre-oxidation of the said oxide. The catalysts were characterised by temperature programmed desorption of CO and specific surface area measurements. The high activity over the pre-reduced cobalt containing catalysts is suggested to be due to the presence of reduced cobalt oxide sites on those samples.

Nyckelord: CO OXIDATION; NO REDUCTION; TEMPERATURE



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Denna post skapades 2012-02-06. Senast ändrad 2012-02-10.
CPL Pubid: 154806

 

Institutioner (Chalmers)

Institutionen för teknisk kemi (1946-1998)
Kompetenscentrum katalys (KCK)
Institutionen för kemisk reaktionsteknik (1972-2001)
Institutionen för teknisk fysik, Kemisk fysik (1900-2015)

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Energi
Materialvetenskap
Nanovetenskap och nanoteknik
Transport
Hållbar utveckling
Kemiteknik

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