Light-off performance over cobalt oxide- and ceria-promoted platinum and palladium catalysts
Artikel i vetenskaplig tidskrift, 1998

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.

TEMPERATURE

CO OXIDATION

NO REDUCTION

Författare

Magnus Skoglundh

Kompetenscentrum katalys (KCK)

Institutionen för teknisk kemi

Anders Törncrona

Institutionen för teknisk kemi

Kompetenscentrum katalys (KCK)

Peter Thormählen

Institutionen för kemisk reaktionsteknik

Chalmers, Teknisk fysik, Kemisk fysik

Kompetenscentrum katalys (KCK)

Erik Fridell

Chalmers, 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 (ISSN)

Vol. 116 113-122

Drivkrafter

Hållbar utveckling

Styrkeområden

Nanovetenskap och nanoteknik

Transport

Energi

Materialvetenskap

Ämneskategorier

Kemiteknik