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- W1551273669 abstract "Ion exchange processes of alkaline earth metal ions on Zr(HPO4)2·H2O have been investigated in the presence of small amounts of NaCl as catalyst. Mg2+-exchange indicates that the catalytic effect occurs with the intermediate formation of the ZrHNa (PO4)2·5H2O phase. A mechanism of exchange is proposed and the ion exchange of Mg2+ on ZrHNa (PO4)2·5H2O in acid and alkaline media are compared. The presence of small amounts of Na+ strongly influences the titration of Zr(HPO4)2·H2O with Ba(OH)2. The Ba2+ ions is rapidly taken up by the exchanger and an almost fully converted Ba-form is obtained with a single transition step. The presence of Na+ does not significantly change the shape of the titration curves of Zr(HPO4)2·H2O with Ca(OH)2 and Sr(OH)2, but it increases appreciably the rate of exchange. This fact is related to the very fast exchange of Ca2+ and Sr2+ on ZrHNa(PO4)2·5H2O. The possibility of using cations other than Na+ as catalysts for the exchange of large ions by layered exchangers is discussed." @default.
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- W1551273669 date "1976-01-01" @default.
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- W1551273669 title "Crystalline insoluble acid salts of tetravalent metals—XXII" @default.
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- W1551273669 doi "https://doi.org/10.1016/0022-1902(76)80669-0" @default.
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