Synthesis of Various Iron Phosphates by Hydrothermal Reaction
1986 Volume 1986 Issue 2 Pages 138-145
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1986 Volume 1986 Issue 2 Pages 138-145
In order to provide inorganic polymers with regularly porous structures for catalysis and inorganic ion exchangers, various iron phosphates were synthesized by hydrothermal reactions, and their characteristics have been investigated. (i) Fe1.0-1.2m0.8-1.5H2.1-3.0(PO4)2 was obtained from iron (II) chloride and MH2PO4 (M=Na, K, NH4). (ii) FeM(HPO4)2 was obtained from iron (III) chloride and MH2PO4. (iii) A yellowish brown or grayish green product composed of FeIIFeIII(PO4)2(OH)2 and iron oxide hydrate was obtained from FeOOH, H3PO4 and (C3H7)3N. (iv) A reaction product between FeCl3, NaH2PO4, NaOH and (C3H7)4NBr( 1: 1.5: 2-3: O.2, 170°C) did not contain the quaternary ammonium salt ad ded as a templating agent. (v) A product obtained under the same conditions as (iv) without (n-C3H7)4NBr gave the same X-ray diffraction pattern as the product in (iv), and the c ompositions of these products were identified as FeIII1.5 Na1.5(PO4)2·O.7-0.8 H2O. The treatment of (iv) or (v) with HCl substituted hydrogen ions for sodium ions in the structure. The HCl-treated product was further reacted with (n-C3H7)3N. The primary d-value of the product was changed from 10.0-10.6Å and 9.9Å by these treatments, respectively. The results of thermal analysis (TG, DTA) revealed that the sodium ions in the product were exchanged with hydrogen ions and that amines were attached to the sites.
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