Optimization of the operative conditions for heteropolyacids synthesis through ion exchange
Phospho-tungstic and phospho-molybdic Wells-Dawson heteropolyacids, H<SUB>6</SUB>P<SUB>2</SUB>W<SUB>18</SUB>O<SUB>62</SUB>.xH<SUB>2</SUB>O and H<SUB>6</SUB>P<SUB>2</SUB>Mo<SUB>18</SUB>O<SUB>62</S...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2005 |
| País: | Argentina |
| Institución: | Universidad Nacional de La Plata |
| Repositorio: | SEDICI (UNLP) |
| Idioma: | inglés |
| OAI Identifier: | oai:sedici.unlp.edu.ar:10915/36938 |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/36938 |
| Access Level: | acceso abierto |
| Palabra clave: | Ciencias Exactas Química Heteropolyacid ammonium compounds ion exchange HPA POM optimization Wells-Dawson phosphorus compounds solutions synthesis organic acids |
| Sumario: | Phospho-tungstic and phospho-molybdic Wells-Dawson heteropolyacids, H<SUB>6</SUB>P<SUB>2</SUB>W<SUB>18</SUB>O<SUB>62</SUB>.xH<SUB>2</SUB>O and H<SUB>6</SUB>P<SUB>2</SUB>Mo<SUB>18</SUB>O<SUB>62</SUB>.xH<SUB>2</SUB>O respectively, were synthesized through ion exchange with a higher yield (∼ 90%) than the conventional organic route (∼ 70%). Pure, non-degraded heteropolyacids are obtained when the corresponding ammonium salt [(NH<SUB>4</SUB>)<SUB> 6</SUB>P<SUB>2</SUB>W<SUB>18</SUB>O<SUB>62</SUB>.13H<SUB>2</SUB>O or (NH<SUB>4</SUB>)<SUB>6</SUB>P<SUB>2</SUB>Mo<SUB>18</SUB>O<SUB>62</SUB>.12H<SUB>2</SUB>O] is kept in contact with an acid resin [about (1:0.8) salt:resin weight ratio] up to three days. The use of an organic media instead of an aqueous media greatly favors the completeness of the exchange. |
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