Reactivity of methanol over copper supported on well-shaped CeO2: a TPD-DRIFTS study†
TPD-DRIFTS experiments upon methanol adsorption over copper (5 wt%) supported on well-shaped ceria (polyhedra, rods and cubes) have been performed for the first time. Support morphology influences the type of methoxy and formate adsorbed species; in polyhedron and rod-shaped catalysts, linear methoxy and formate are the predominant species, while in cube-shaped catalyst, bridged species dominate. In the catalysts, desorption of H2 and CO2 increases significantly indicating that besides dehydrogenation of adsorbed methoxy, oxidation of adsorbed formate species is taking place. Heterogeneity of surface sites (copper, ceria and copper/ceria interface), surface defects and acid–base properties may account for the differences in the desorption profiles and reactivities of the adsorbed species over the three copper–ceria catalysts.
- This article is part of the themed collections: 2017 Catalysis Science & Technology HOT Articles and Catalytic reactivity of surfaces: in recognition of François Gault