Affiliation:
1. Max Planck-Cardiff Centre on the Fundamentals of Heterogeneous Catalysis (FUNCAT) Cardiff Catalysis Institute School of Chemistry Cardiff University Cardiff CF10 3AD UK
2. UK Catalysis Hub, RCAH Rutherford Appleton Laboratory Didcot OX11 0QX UK
3. School of Chemistry University of Southampton Southampton SO17 1BJ UK
Abstract
AbstractThe properties of Mo‐doped iron oxide are compared with those of the single oxides of Fe and Mo, and with stoichiometric ferric molybdate for the selective oxidation of methanol. It is found that Mo oxide segregates to the surface of the iron oxide at low loadings, while at higher loadings, but below the stoichiometric ratio, presents layers of ferric molybdate at the surface. The relationship between bulk loading and surface Mo is explored, and it is concluded that the reactivity is dominated by ensemble effects. Simple modelling indicates that four or more Fe cation ensembles are required to combust methanol to CO2, ensembles of two Mo cations are required for selective oxidation to formaldehyde, whereas it seems that isolated single sites of either Fe or Mo produce CO.
Funder
Engineering and Physical Sciences Research Council
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