Structural study of VO {sub x} doped aluminium fluoride and aluminium oxide catalysts

Journal Article · Thu Feb 15 00:00:00 EST 2007 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2006.12.003· OSTI ID:21015706

Scheurell, Kerstin ^[1]; Scholz, Gudrun ^[1]; Kemnitz, Erhard ^[1]

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1. Institute of Chemistry, Humboldt University of Berlin, Brook-Taylor-Street 2, Berlin D-12489 (Germany)

The structural properties of vanadium doped aluminium oxyfluorides and aluminium oxides, prepared by a modified sol-gel synthesis route, were thoroughly investigated. The influence of the preparation technique and the calcination temperature on the coordination of vanadium, aluminium and fluorine was analysed by different spectroscopic methods such as Raman, MAS NMR and ESR spectroscopy. In all samples calcined at low temperatures (350 deg. C), vanadium coexists in two oxidation states V{sup IV} and V{sup V}, with V{sup IV} as dominating species in the vanadium doped aluminium oxyfluorides. In the fluoride containing solids aluminium as well as vanadium are coordinated by fluorine and oxygen. Thermal annealing of 800 deg. C leads to an extensive reorganisation of the original matrices and to the oxidation of V{sup IV} to V{sup V} in both systems. - Graphical abstract: Structure model for VO {sub x} doped aluminium oxide.

• OSTI ID: 21015706
• Journal Information: Journal of Solid State Chemistry, Vol. 180, Issue 2; Other Information: DOI: 10.1016/j.jssc.2006.12.003; PII: S0022-4596(06)00639-6; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ALUMINIUM FLUORIDES
ALUMINIUM OXIDES
ANNEALING
CALCINATION
DOPED MATERIALS
ELECTRON SPIN RESONANCE
FLUORINE
NUCLEAR MAGNETIC RESONANCE
OXIDATION
OXYFLUORIDES
SOL-GEL PROCESS
SPECTROSCOPY
SYNTHESIS
TEMPERATURE RANGE 0400-1000 K
VANADIUM
VANADIUM OXIDES