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Effect of nitridation on the electronic environment of vanadium in VAlO(N) powder catalysts, used for the ammoxidation of propane |
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| Authors: | G Silversmit H Poelman R De Gryse W Bras S Nikitenko M Florea P Grange S Delsarte |
| Affiliation: | aGhent University, Department of Solid State Sciences, Surface Physics Division, Krijgslaan 281, S1, B-9000 Gent, Belgium bNetherlands Organisation for Scientific Research (NWO), DUBBLE @ ESRF, BP 220, 38043 Grenoble Cedex 9, France cCatholic University Leuven, DUBBLE @ ESRF, BP 220, 38043 Grenoble Cedex 9, France dUniversité Catholique de Louvain, Unité de Catalyse et Chimie des Matériaux Divisés, 2/17 Croix du Sud, 1348 Louvain-la-Neuve, Belgium |
| Abstract: | VAlO(N) oxynitrides are promising novel catalysts for the ammoxidation of propane to acrylonitrile. These catalysts are obtained after nitridation of a VAlO oxide precursor in NH3 or during the reaction in a NH3/C3H8/O2 mixture. The local structure around the vanadium atoms in the oxide precursor and in several catalysts that have been used in catalytic tests is studied by X-ray absorption spectroscopy (XAS). The nitridation in NH3 was followed with in situ XAS. The oxide precursors have tetrahedral co-ordinated vanadium, while after full nitridation octahedrons are found and a small decrease in vanadium oxidation state occurs. The catalysts used in the ammoxidation reaction consist of a mixture of these tetrahedrons and octahedrons. |
| Keywords: | Acrylonitrile Ammoxidation Catalyst VAlON Oxynitrides V K-edge X-ray absorption spectroscopy |
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