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)]


Published in:
Applied Catalysis A: General, 151, 1, 223-246
Year:
1997
Keywords:
Note:
CAN 126:214161
51-11
Fossil Fuels, Derivatives, and Related Products
Swiss Federal Institute of Technology,Lausanne,Switz.
Journal
0926-860X
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)
Laboratories:




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