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The potential of a new catalyst class based on vanadium containing oxynitrides has been explored in the ammoxidation of 3-picoline (3-PIC) to 3-cyanopyridine (3-CP). So far, mixed oxides of the type SbVTiSiO belong to the best catalysts for this reaction, however, space-time yields (STY) did not exceed 150 g/lh. Improving STY while maintaining high 3-CP selectivity would be energetically most sustainable. Therefore, ternary VAlZrON and VZrPON, binary VMoON and VSbON oxynitrides as well as VMON/MoxOyNz (M = Al or Zr) catalysts have been investigated for their catalytic performance and structure-reactivity relationships. With VZrAlON catalysts, highest STY values ever measured have been obtained, while VSbON catalysts bear a great potential, too. By spectroscopic multimethod analysis, applied ex and in situ, structure-reactivity relationships have been proposed. The presence of direct V-N junctions and anionic surface defects are essential for high nitrile selectivity. This is the best fulfilled for VZrAlON, VMoON and VSbON catalysts.
ISBN-10 (Impresion) | 3954040379 |
ISBN-13 (Impresion) | 9783954040377 |
ISBN-13 (E-Book) | 9783736940376 |
Idioma | Inglés |
Numero de paginas | 154 |
Laminacion de la cubierta | Brillante |
Edicion | 1 Aufl. |
Volumen | 0 |
Lugar de publicacion | Göttingen |
Lugar de la disertacion | Rostock |
Fecha de publicacion | 28.02.2012 |
Clasificacion simple | Tesis doctoral |
Area |
Química
|