Abstract
Vanadium oxide promoted Rh/SiO2 catalyst precursors which were calcined at 573, 773, 973 and 1173 K, were characterized by51V-NMR. V2O5 is present in all materials and RhVO4 is formed at 1173 K. An additional interaction species with vanadium in distorted tetrahedral oxygen environment is found after calcination at 973 K. These phases might have relevance for catalytic promotion of reduced Rh° metal catalysts by VOx. In addition, distorted tetrahedral VO4 species which are capable of interacting with water molecules (V2 species) and distorted octahedral species having water molecules in their coordination sphere (V5 species) have been detected.
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Lapina, O.B., Mastikhin, V.M., Nosov, A.V. et al. Characterization of silica-supported vanadia-promoted rhodium catalysts by51V-NMR spectroscopy. Catal Lett 13, 203–211 (1992). https://doi.org/10.1007/BF00770992
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DOI: https://doi.org/10.1007/BF00770992