Optimization Of The Operative Conditions For Heteropolyacids Sintesis Through Ion Exchange

SILVANA R. MATKOVIC, GRACIELA M. VALLE, LAURA E. BRIAND.

MATERIALS RESEARCH

Associação Brasileira de Metalurgia e Materiais; Ass. Bras. de Cerâmica; Ass. Bras. de Polímeros; Soc. Bras. de Crescimento de Cristais; Soc. Bras. de Cristalografia;Soc Bras. de Microscopia e Microanálise;Soc. Brasileira de pesquisa em Materiais

Lugar: São Carlos ; Año: 2005 vol. 8 p. 351 - 355

1516-1439

Phospho-tungstic and phospho-molybdic Wells-Dawson heteropolyacids, H6P2W18O62.xH2O andH6P2Mo18O62.xH2O 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 [(NH4)6P2W18O62.13H2O or (NH4)6P2Mo18O62.12H2O] 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