On the Catalytic Activity of Co3O4 in Low-Temperature CO Oxidation

Jonas Jansson; Anders Palmqvist; Erik Fridell; Magnus Skoglundh; Lars Österlund; Peter Thormählen; Vratislav Langer

doi:10.1006/jcat.2002.3738

On the Catalytic Activity of Co3O4 in Low-Temperature CO Oxidation
Journal article, 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

Author

Jonas Jansson

Chalmers, Department of Chemical Engineering and Environmental Sciences, Chemical Reaction Engineering