Abstract
The FT-IR spectra of the surface species arising from the adsorption of methanol, formaldehyde and formic acid on pure vanadia and vanadia-silica are discussed. On both surfaces methanoi adsorbs mainly in the form of methoxy groups, and is oxidized to a transient dioxymethylene species that desorbs near 450 K. Formaldehyde is adsorbed at low temperature in the form of dioxymethylene and polyoxymethylene species, that are weakly bonded and desorb near room temperature, leaving the clean surface. Neither formaldehyde nor methanoi produces surface formate groups by oxidation, in spite of the usual stability of these species when arising from formic acid adsorption. This is interpreted as evidence of the lability of dioxymethylene species towards formaldehyde desorption, as a key catalyst requirement to induce high selectivity towards formaldehyde in methanoi oxidation.
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