In-situ surface and gas phase analysis for kinetic studies under transient conditions. The catalytic hydrogenation of CO2

Transient measurement techniques were applied to the kinetic investigation of the reaction mechanism of CO2 methanation, using diffuse-reflectance IR spectroscopy and mass spectrometry. The coupled information of the surface intermediates and the time evolution of the gas-phase components leads to accurate identification of spectator species on the surface. Reaction intermediates (e.g., CO and formates) were identified. The former is a key intermediate, and its hydrogenation leads to methane formation. The latter is fixed on the support, in equil. with a active formate species on the interface metal-support. A reaction mechanism was proposed, including the formation of formates through a carbonate species. [on SciFinder (R)]