The effect of carbon deposition in the deactivation of a 2% Pt/CeO 2 under RWGS conditions was investigated via an accelerated ageing procedure consisting of measuring the catalyst activity (under 1% CO 2, 4% H 2, 300°C) before and after exposure to CO, CO 2, H 2, or CH 4 at 400°C. Exposure to CO led to severe deactivation while exposure to CO 2, CH 4, or H 2 led to moderate or no deactivation. Additional activity measurements performed before and after exposure to CO followed by subsequent temperature-programmed oxidation (TPO) showed that exposure to increasing amounts of CO led to increased deposits of carbon and deactivation. No evidence for metal sintering was found. Additional TPO following catalyst exposure to RWGS conditions evidenced the deposition of carbonaceous deposits under the RWGS reactant mix.
- Active site
- Carbon deposition
- Reverse water gas shift
- Temperature-programmed oxidation
ASJC Scopus subject areas
- Physical and Theoretical Chemistry