Catalytic CO₂Hydrogenation on Nickel: Novel Insight by Chemical Transient Kinetics

Abstract

Carbon dioxide hydrogenation on support-free nickel model catalysts was investigated by means of a time-resolved quantitative analysis of chemical transients triggered by abrupt changes in the reactant partial pressures. It was found that carbon dioxide adsorption is strongly affected by the presence of hydrogen and by coadsorption effects and thus influences the reaction rate in the buildup and back transients. The observed transients suggest that two reaction mechanisms operate in parallel, which is consistent with previous results obtained using a Ni singlecrystal termination. The initial reaction rate involves fast direct hydrogenation of CO 2 , whereas the rate under steady-state conditions is lower due to a change in the mechanism involving an oxygen-containing intermediate.

Recent development in catalytic technologies for methanol synthesis from renewable sources: A critical review

“…The chemical conversion of CO 2 via catalytic reaction especially hydrogenation of CO 2 is recently becoming attractive because it may lead to the production of commercial compounds like formic acid, methanol, carbon monoxide, methane, and other hydrocarbons [19]. Eq.…”

Photothermal Conversion of CO2 into CH4 with H2 over Group VIII Nanocatalysts: An Alternative Approach for Solar Fuel Production

“…The highly efficient CO 2 conversion is due to several features of the Group VIII nanocatalysts, including effective energy utilization over the whole range of the solar spectrum, excellent photothermal performance, and a unique H 2 activation ability (to create active H atoms, which are the key intermediates for CO 2 hydrogenation at low onset temperatures). [11] Herein, the intentional use of inert Figure S3; the particle size of the Group VIII nanocatalysts varied from several nanometers to several tens of nanometers). CO 2 (ca.…”

Use of CuNi/YSZ and CuNi/SDC Catalysts for the Reverse Water Gas Shift Reaction

“…A second Eley-Rideal mechanism would occur if CO 2 in the gas phase reacted with adsorbed H 2 as shown in (9). Vesselli et al [34,35] have described the occurrence of the Eley-Rideal mechanism in RWGS reactions:…”