Synthesis and Characterization of Some Heterometal-Substituted Ammonium Gallophosphates

Authors :: Overweg, A. R.
Haan, J. W. de
Magusin, P. C. M. M.
Santen, R. A. van
Sankar, G.
Thomas, J. M.
Source :: Chemistry of Materials; July 19, 1999, Vol. 11 Issue: 7 p1680-1686, 7p
Publication Year :: 1999
Abstract: Various metal-substituted ammonium gallophosphates (metal is Zn, Mn, Mg, and Fe) have been synthesized. Characterization by X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), and <SUP>31</SUP>P MAS and <SUP>71</SUP>Ga MAS NMR shows that the structures are similar and isostructural to the known ammonium cobalt gallophosphate hydrate, [NH<INF>4</INF>][CoGa<INF>2</INF>P<INF>3</INF>O<INF>12</INF>(H<INF>2</INF>O)<INF>2</INF>]. It is concluded from a combined in situ XRD/XAS study that the gallophosphate molecular sieves described here are not thermally stable and lose their microporous nature above 350 °C.

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