%0 Journal Article
%T Optimization of the operative conditions for heteropolyacids synthesis through ion exchange
%A Matkovic
%A Silvana Raquel
%A Valle
%A Graciela Manuela
%A Briand
%A Laura Estefania
%J Materials Research
%D 2005
%I ABM, ABC, ABPol, SBCC, SBCr, SBMM, SBPMat
%R 10.1590/S1516-14392005000300022
%X 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.
%K wells-dawson
%K heteropolyacid
%K pom
%K hpa.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S1516-14392005000300022&lng=en&nrm=iso&tlng=en