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)]
Titre
In-situ surface and gas phase analysis for kinetic studies under transient conditions. The catalytic hydrogenation of CO2
Publié dans
Applied Catalysis A: General
Volume
151
Numéro
1
Pages
223-246
Date
1997
ISSN
0926-860X
Note
CAN 126:214161
51-11
Fossil Fuels, Derivatives, and Related Products
Swiss Federal Institute of Technology,Lausanne,Switz.
Journal
written in English.
71-47-6 (Formate); 71-52-3 (Hydrogen carbonate); 3812-32-6 (Carbonate) Role: FMU (Formation, unclassified), RCT (Reactant), FORM (Formation, nonpreparative), RACT (Reactant or reagent) (adsorbed, intermediate; in-situ surface and gas-phase anal. for mechanisms and intermediates in carbon dioxide methanation); 74-82-8 (Methane) Role: FMU (Formation, unclassified), FORM (Formation, nonpreparative) (in-situ surface and gas-phase anal. for mechanisms and intermediates in carbon dioxide methanation); 124-38-9 (Carbon dioxide) Role: RCT (Reactant), RACT (Reactant or reagent) (in-situ surface and gas-phase anal. for mechanisms and intermediates in carbon dioxide methanation); 630-08-0 (Carbon monoxide) Role: FMU (Formation, unclassified), RCT (Reactant), FORM (Formation, nonpreparative), RACT (Reactant or reagent) (intermediate; in-situ surface and gas-phase anal. for mechanisms and intermediates in carbon dioxide methanation); 13463-67-7 (Titanium dioxide) Role: CAT (Catalyst use), USES (Uses) (support; in-situ surface and gas-phase anal. for mechanisms and intermediates in carbon dioxide methanation); 7440-18-8 (Ruthenium) Role: CAT (Catalyst use), USES (Uses) (titania-supported; in-situ surface and gas-phase anal. for mechanisms and intermediates in carbon dioxide methanation)
Date de création de la notice
2006-04-18
