Physicochemical properties of vanadium impregnated Al-PILCs: Effect of vanadium source

- Vanadium was incorporated into Al-PILC using NaVO3 or VOSO4·3H2O precursors by wet impregnation, washing after wet impregnation and impregnation from solution methods.
- The layered structure of the supports was retained after the vanadium incorporation.
- Incorporation took place both by settling and ion exchange mechanism with the treatment VOSO4·3H2O precursor while settling was dominant in the use of NaVO3 precursor.
- Treatment with VOSO4·3H2O which was acidic in solution resulted in more structural deformation.
- V2O5 and VO2 were found as the major oxide forms on the impregnated samples. Loading of vanadyl sulfate hydrate (VOSO4·H2O) resulted in higher V/Si ratio. Most of the vanadium was bonded in +5 oxide form.
- Changes in the FTIR signals after vanadium incorporation caused by Brønsted and Lewis sites, silanol, water and vanadium vibrations were occured.
- Dehydroxylation of the structure took place around 300 °C. Samples obtained by impregnation and washing after wet impregnation methods resulted in similar mass losses and the wet impregnated sample showed the highest mass loss among the impregnated samples.