Diffuse-reflectance FTIR spectroscopy for kinetic and mechanistic studies of carbon dioxide hydrogenation in a continuous recycle reactor
CO2 methanation over Ru/TiO2 was studied by using a diffuse-reflectance IR cell coupled with a continuous-feed recycle reactor. Metal-adsorbed CO is a major reaction intermediate and at 120 Deg occupies approx. 40% of the available Cu surface, while CH4 formation proceeds at a turnover frequency of 2.8 * 10-3/s. In contrast, CO methanation is totally hindered under the same conditions. A simple kinetic model is proposed to account for the main trends obsd. For CO2 methanation, the temp. insensitivity of adsorbed CO coverage is interpreted on the basis of a generalized (2-stage) intermediate supply/consumption mechanism involving the reverse water-gas shift reaction. [on SciFinder (R)]
Keywords: Kinetics of hydrogenation; Kinetics of methanation (of carbon dioxide ; over ruthenium-titania); Methanation (of carbon dioxide ; over ruthenium-titania ; mechanism of ; diffuse-reflectance FTIR spectroscopy in in-situ study of); Hydrogenation (of carbon di ; carbon dioxide methanation kinetics mechanism; hydrogenation kinetics mechanism carbon dioxide
Fossil Fuels, Derivatives, and Related Products
Swiss Fed. Inst. Technol.,Lausanne,Switz.
written in English.
7440-18-8 (Ruthenium) Role: CAT (Catalyst use), USES (Uses) (catalyst, on titania, for carbon dioxide methanation, diffuse-reflectance FTIR spectroscopy in in-situ study of); 1333-74-0 Role: USES (Uses) (hydrogenation, of carbon dioxide, to methane, over ruthenium-titania, mechanism of, diffuse-reflectance FTIR spectroscopy in in-situ study of); 124-38-9 (Carbon dioxide) Role: RCT (Reactant), RACT (Reactant or reagent) (methanation of, over ruthenium-titania); 74-82-8P (Methane) Role: PREP (Preparation) (prepn. of, by hydrogenation of carbon dioxide, over ruthenium-titania)
Record created on 2006-04-18, modified on 2016-08-08