Temporal analysis of products (TAP) reactor study of the dynamics of CO2 interaction with a Ru/γ-Al2O3 supported catalyst II: Interaction strength, formation of intermediates and oxygen exchange

Continuing a comprehensive study of the reduction of CO over supported Ru catalysts, we explored the interaction of CO with Ru/γ-AlO by TAP reactor measurements, focusing on dynamic aspects in adsorption/desorption, reaction and oxygen exchange processes. Pulse shape analysis in H/CO multipulse sequences provides information on the interaction of reactant/product species with the catalyst. The measurements provide information on the dynamic build-up of reaction intermediates and more stable adspecies during pulsing, and its relation to CH formation. Facile oxygen exchange between CO and catalyst, followed by isotope labeling experiments, is quantitatively reconciled in a simple model, relating the ratio between different CO isotopologues to the O:O ratio in the total exchangeable oxygen on the surface and in the CO pulse. The results provide detailed insight into various aspects of the interaction between CO and Ru/AlO catalysts important for a mechanistic understanding of various catalytic reactions involving CO.