Efficient photocatalytic recycling of CO 2 into a hydrocarbon fuel is an important scientific and societal goal. Adsorption of CO 2 on photocatalysts is a crucial step in this process. FT-IR studies of CO 2 adsorption on titania nanotubes (NT) and Pt-NT (Pt-dispersed on NT) were undertaken to probe the nature of adsorption sites, and to investigate thermal reactions on the surfaces of these materials. The NTs and Pt-Nts were oxidized at 350° C and subsequently cooled to room temperature. The NTs and Pt-Nts were then either exposed to CO 2, or to H 2 at 350° C and then to CO 2. Exposure to CO 2 leads to formation of monodentate carbonates, bidentate carbonates and bicarbonates on both the NTs and Pt-NTs. The marked difference in the infrared spectra of the NTs and the Pt-NTs subsequent to interaction with CO 2 will be discussed as will XPS data for these materials.
ASJC Scopus subject areas
- Chemical Engineering(all)