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Formation and characterization of nanostructured V—P—O particles in flames: A new route for the formation of catalysts

Published online by Cambridge University Press:  03 March 2011

Philippe F. Miquel  and
Joseph L. Katz
Philippe F. Miquel
Affiliation:
Department of Chemical Engineering, The Johns Hopkins University, Baltimore, Maryland 21218-2689
Joseph L. Katz*
Affiliation:
Department of Chemical Engineering, The Johns Hopkins University, Baltimore, Maryland 21218-2689
*
a)Address all correspondence to this author.
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Abstract

A counterflow diffusion flame burner was used to produce nanophase vanadium-phosphorus oxide powders in a hydrogen-oxygen flame. Liquid precursors, i.e., VOCl3 and PCl3, were used as source materials in a 1:1 ratio. In situ formation processes were investigated at two temperatures by laser light scattering, by emission and absorption spectroscopy, and by collecting particles directly onto carbon-coated TEM grids. At the higher temperature, the collected powders are spherical particles about 30 to 50 nm in diameter. At the lower temperature, the powders collected are chain-like structures composed of particles 5 to 10 nm in diameter. Particles formed in the burner were collected also from the burner's flanges and from two auxiliary strips. Their crystalline phases and surface area were determined by x-ray diffractometry, FT-IR spectroscopy, and BET analysis by nitrogen desorption. These results indicate a strong influence of temperature on the crystalline phases of the powders. At the higher temperature, the powder collected is a mixture of VOPO4 · 2H2O and δ-VOPO4. This mixture forms Λ-VOPO4 upon subsequent reheating at 750 °C. At the lower temperature, the powders collected are a VOHxPO4 · yH2O phase and VO(H2PO4)2, and form β-VOPO4 and V(PO3)3, respectively, upon subsequent reheating at 750 °C.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 3 , March 1994 , pp. 746 - 754
Copyright
Copyright © Materials Research Society 1994

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