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Published on: December 6, 2021
CO Hydrogenation on Cobalt-Based Catalysts: Tin Poisoning Unravels CO in Hollow Sites as a Main Surface Intermediate
Anaëlle Paredes-Nunez1, Davide Lorito1, Laurence Burel1
1Institut de Recherches sur la Catalyse et l'Environnement de Lyon, Univ Lyon, Université Lyon 1, CNRS, 2, Av. Albert Einstein, 69626, Villeurbanne, France.
Abstract:
Site poisoning is a powerful method to unravel the nature of active sites or reaction intermediates. The nature of the intermediates involved in the hydrogenation of CO was unraveled by poisoning alumina-supported cobalt catalysts with various concentrations of tin. The rate of formation of the main reaction products (methane and propylene) was found to be proportional to the concentration of multi-bonded CO, likely located in hollow sites. The specific rate of decomposition of these species was sufficient to account for the formation of the main products. These hollow-CO are proposed to be main reaction intermediates in the hydrogenation of CO under the reaction conditions used here, while linear CO are mostly spectators.
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