|
|||||
|
|
Preparation and characterisation of vanadium catalysts supported over alumina-pillared clays |
|
| Authors: | M A Vicente C Belver R Trujillano M A Baares-Muoz V Rives S A Korili A Gil L M Gandía J -F Lambert |
| Affiliation: | a Departamento de Química Inorgánica, Universidad de Salamanca, Plaza de la Merced s/n, E-37008, Salamanca, Spain b Departamento de Química Aplicada, Edificio Los Acebos, Universidad Pública de Navarra, Campus de Arrosadía s/n, E-31006, Pamplona, Spain c Laboratoire de Reactivité de Surface, Université Pierre et Marie Curie, 4 Place Jussieu, Tour 54, Casier 178, 75252, ParisCedex 05, France |
| Abstract: | Supported vanadium-containing catalysts were prepared by impregnation of Al-pillared clays with NaVO3 precursor aqueous solutions. A montmorillonite and a saponite, both natural as well as previously pillared with Al13-Keggin polycations, were used as supports, being impregnated with solutions of the precursor by means of the incipient wetness technique. The layered structure of the supports is maintained after impregnation, and even after calcination of the impregnated solids at 500 °C, although with a significant worsening of the textural properties of the solids, in particular, a loss of specific surface area. Three crystalline vanadium-containing phases were identified in the impregnated solids, namely, NaV3O8, AlVO4 and V2O5 (shcherbinaite). The reduction of these phases to V3+ species was observed as wide processes in the 450–750 °C range, all of them centred at ca. 600 °C. |
| Keywords: | Al-pillared clays Supported vanadium catalysts Saponite Montmorillonite |
| 本文献已被 ScienceDirect 等数据库收录！ | |
