Optimization of the operative conditions for heteropolyacids synthesis through ion exchange

Optimization of the operative conditions for heteropolyacids synthesis through ion exchange

Phospho-tungstic and phospho-molybdic Wells-Dawson heteropolyacids, H6P2W18O62 .xH2O and H6P2Mo18O62 .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 correspondi...

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Bibliographic Details
Main Authors: Silvana Raquel Matkovic, Graciela Manuela Valle, Laura Estefania Briand
Format: Article
Language:English
Published: Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) 2005-09-01
Series:Materials Research
Subjects:
Wells-Dawson
heteropolyacid
POM
HPA
Online Access:http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392005000300022
Description
Summary:Phospho-tungstic and phospho-molybdic Wells-Dawson heteropolyacids, H6P2W18O62 .xH2O and H6P2Mo18O62 .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)6P2W18 O62.13H2O or (NH4)6P2Mo18 O62.12H2O] 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.
ISSN:1516-1439

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