Co/TiO₂ catalyst for high pressure dry reforming of methane and its modification by other metals

Catalytic behaviour of 0.5wt%Co/TiO₂, prepared from TiO ₂ containing only anatase phase, in CH₄/CO₂ reforming at 2 MPa was strongly affected by reduction temperature. Co/TiO ₂ reduced at relatively lower temperatures (<1123 K) lost all of its activity at the beginning of the reaction, whereas the catalyst reduced at higher temperatures (1123 K) showed relatively stable activity with only a slight amount of deposited coke. However, the latter catalyst lost all of activities at a higher space velocity after the reaction for 20 h, mainly due to oxidation of metallic Co. The addition of trace amounts of noble metals (Pt or Ru) improved the catalytic stability drastically by retarding the oxidation. It was confirmed that the strong resistant nature of Co/TiO₂ to coke deposition was retained after the addition of the noble metals.