On the coke deposition in dry reforming of methane at elevated pressures

- Carbon nanotubes constitute the main source of carbonaceous deposits during DRM at elevated pressures.
- The active metal and the reactant (CH4 or CO2) do not influence the nature of the carbonaceous deposits.
- CH4 dissociation follows the same route on both metals.
- Pt converts CH4 at a higher rate than Ni.
- Adsorbed CO is a key intermediate for the carbon formation on Ni, while it does not contribute to the coke deposition on Pt.