Abstract
Layered a-zirconium hydrogenphosphate monohydrate was prepared by direct precipitation, exchanged with n-propylamine and then by chromium aquacomplexes. The solids were characterized by X-ray diffraction, mass spectrometry, infrared and UV-Visible spectroscopy. The results suggest that monomer complexes form extended, hydrogen bonded, sandwiched monolayers in the interlayer space.
Highlights
Layered phosphates such as Zr(HPO4)[2].H2O, or α-ZrP, have important applications as ion-exchangers, heterogeneous catalysts and ionic conductors[1,2]
Layered α-zirconium hydrogenphosphate monohydrate was intercalated with chromium aquacomplexes
Two methods were compared for cation exchange; chromium hydroxide was hydrolyzed with dilute acid or triethylamine was added to an aqueous solution of a chromium salt before addition of the n-propylamine exchanged ZrP
Summary
Layered phosphates such as Zr(HPO4)[2].H2O, or α-ZrP, have important applications as ion-exchangers, heterogeneous catalysts and ionic conductors[1,2]. The X-ray diffraction pattern in Fig. 1b shows that, after intercalation by n-propylamine, materials with lower cristallinity were obtained with interlayer distance of 17.26 and 16.36 Å. Chemical analysis after exchange indicated Cr and water contents of 13.5 wt.0% and 26 wt.% respectively, corresponding to a ratio Cr/Zr ≅ 0.84 for material prepared from the hydroxide precursor.
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