Synthesis, characterization and catalytic properties of vanadium aluminophosphate molecular sieves VAPO-31 and VAPSO-Amr from non-aqueous media
| Title | Synthesis, characterization and catalytic properties of vanadium aluminophosphate molecular sieves VAPO-31 and VAPSO-Amr from non-aqueous media |
| Publication Type | Journal Article |
| Year of Publication | 2006 |
| Authors | Venkatathri, N |
| Journal | Applied Catalysis A-General |
| Volume | 310 |
| Pagination | 31-39 |
| Date Published | AUG |
| Type of Article | Article |
| ISSN | 0926-860X |
| Keywords | cyclic voltammetry, ESR, FT-IR, MAS NMR, non-aqueous, SEM, TG/DTA, UV-Vis, VAPO-31, XPS, XRD |
| Abstract | Vanadium samples containing aluminophosphate molecular sieve (VAPO-31) and amorphous vanadium silicoaluminophosphate (VAPSO-Amr) have been synthesized using hexamethyleneimine template from non-aqueous media for the first time. XRD and SEM analyses confirm the phase purity of the synthesized samples. FT-IR analysis suggests the incorporation of V4+ in the aluminophosphate framework. ESR, UV-vis spectroscopic, and XPS techniques and cyclicvoltametric studies confirm the incorporation of vanadium and reveal its presence in tetrahedral and square pyramidal environments in the as-synthesized samples. Cyclic voltammetry reveals the presence of two redox couples in VAPO-31. This catalyst is found to be a good oxidation catalyst. Although most of the properties of VAPO-31NA and VAPSO-Amr are similar, the latter can access more vanadium and V4+ ions. Compared to aqueous media samples, it can incorporate more vanadium especially V5+, ions and has been found to be better oxidation catalyst. The physicochemical properties also change with media. (C) 2006 Elsevier B.V. All rights reserved. |
| DOI | 10.1016/j.apcata.2006.05.001 |
| Type of Journal (Indian or Foreign) | Foreign |
| Impact Factor (IF) | 4.012 |