Use of boron phosphate in the solid-state preparation of crystalline iron(III) phosphate and manganese(II) diphosphate

Journal Article · Sun May 01 04:00:00 EDT 1994 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1994.tb05419.x· OSTI ID:7185330

Vasovic, D D; Stojakovic, D R ^[1]

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1. Univ. of Belgrade (Yugoslavia). Faculty of Technology and Metallurgy

A growing interest has been noticed lately in the preparation of metal phosphates with specific structural properties for use as catalysts in various organic reactions, for phosphate-type molecular sieves, and as materials for long-term storage of nuclear wastes. The possibility of using BPO[sub 4] for the solid-state preparation of crystalline phosphates of trivalent iron, manganese, and chromium has been investigated. If BPO[sub 4] and Fe[sub 2]O[sub 3] are heated at 900 C, a complete conversion of BPO[sub 4] to the quartz form of FePO[sub 4] results after 9 h. If FeCl[sub 3][center dot]6H[sub 2]O is used instead of Fe[sub 2]O[sub 3], a multiphase crystalline product is obtained in which the dominant phase is the quartz form of FePO[sub 4]. The reaction of BPO[sub 4] with Mn[sub 2]O[sub 3] or MnO[sub 2] at 830 C yields Mn[sub 2]P[sub 2]O[sub 7]; the amount of conversion of BPO[sub 4] to Mn[sub 2]P[sub 2]O[sub 7] after 4 h is 80% (if Mn[sub 2]O[sub 3] is used) and 75% (if MnO[sub 2] is used). However, the method is not successful in the preparation of phosphates of chromium: the reaction of BPO[sub 4] and some chromium compounds yields [alpha]-Cr[sub 2]O[sub 3] as the only chromium-containing product.

• OSTI ID: 7185330
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 77:5; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

052002 -- Nuclear Fuels-- Waste Disposal & Storage
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
BORON COMPOUNDS
BORON PHOSPHATES
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
CHROMIUM PHOSPHATES
HALIDES
HALOGEN COMPOUNDS
HYDRATES
IRON CHLORIDES
IRON COMPOUNDS
IRON OXIDES
IRON PHOSPHATES
KINETICS
MANAGEMENT
MANGANESE COMPOUNDS
MANGANESE OXIDES
MANGANESE PHOSPHATES
OXIDES
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
RADIOACTIVE WASTE MANAGEMENT
RADIOACTIVE WASTE STORAGE
REACTION KINETICS
STORAGE
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
WASTE FORMS
WASTE MANAGEMENT
WASTE STORAGE