Abstract
Catalytic performance depends largely on the surface properties. Here, the surface phase composition of iron molybdate catalysts with different Mo/Fe atomic ratios calcined at different temperatures was studied by UV Raman spectroscopy. In this study, the surface enrichment of MoO3 that the Mo-rich catalysts undergo during calcination treatment is revealed by the increase in the Raman intensity of MoO3. X-ray photoelectron spectroscopy (XPS) analysis provides further evidence that the concentration of Mo increases evidently with increasing calcination temperature. The surface enrichment of MoO3 also results in a significant variation of the morphologic appearance as evidenced by the presence of a needle-like material assigned to MoO3 on the surface, while the surface phase composition remains almost unchangeable for the sample with a stoichiometric atomic ratio. These results are attributable to the formation of a substitution structure of Fe3+ ions in an octahedral coordination by Mo6+ ions in Mo-rich ca...
Published Version
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