On the Catalytic Activity of Co3O4 in Low-Temperature CO Oxidation
Artikel i vetenskaplig tidskrift, 2002
Oxidation of CO over Co3O4 at ambient temperature was studied with flow reactor experiments, and in-situ spectroscopic and structural methods. The catalyst deactivates during the reaction. The rate of deactivation increased with increasing CO or CO2 gas-phase concentration but decreased with increased 02 concentration or increased temperature. Regeneration of the catalyst in 10% O-2/Ar was more efficient than regeneration in Ar alone. The presence of carbonates and surface carbon on the deactivated catalyst was concluded from TPO experiments. None of these species could, however, be correlated with the deactivation of the catalyst. In-situ FTIR showed the presence of surface carbonates, carbonyl, and oxygen species. The change in structure and oxidation state of the catalyst was studied by in-situ XRD, in-situ XANES, XPS, and flow reactor experiments. One possible explanation for the deactivation of the catalyst is a surface reconstruction hindering the redox cycle of the reaction.
XPS
in-situ XRD
in-situ FTIR
catalyst deactivation
in-situ XANES
cobalt oxide
low-temperature activity
CO oxidation
Författare
Jonas Jansson
Chalmers, Institutionen för kemiteknik och miljövetenskap, Kemisk reaktionsteknik
Kompetenscentrum katalys
Anders Palmqvist
Institutionen för kemisk miljövetenskap
Kompetenscentrum katalys
Erik Fridell
Chalmers, Institutionen för kemiteknik och miljövetenskap
Kompetenscentrum katalys
Magnus Skoglundh
Chalmers, Institutionen för kemiteknik och miljövetenskap
Kompetenscentrum katalys
Lars Österlund
Kompetenscentrum katalys
Chalmers, Institutionen för kemiteknik och miljövetenskap
Peter Thormählen
Kompetenscentrum katalys
Chalmers, Institutionen för kemiteknik och miljövetenskap
Vratislav Langer
Chalmers, Institutionen för oorganisk miljökemi
Journal of Catalysis
0021-9517 (ISSN) 1090-2694 (eISSN)
Vol. 211 2 387-397Drivkrafter
Hållbar utveckling
Styrkeområden
Nanovetenskap och nanoteknik
Transport
Energi
Materialvetenskap
Ämneskategorier
Kemiteknik
Kemi
DOI
10.1006/jcat.2002.3738