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Novel Phases in the V-P-O Catalytic System from Oxovanadium Hydrogenphosphate Precursors

Published online by Cambridge University Press:  21 February 2011

P. Amoros ,
M. D. Marcos ,
J. Alamo ,
A. Beltran  and
P. Beltran
P. Amoros
Affiliation:
UIBCM and UICM, Departament de Química Inorgánica, Facultat de Químiques, Universität de Valencia, Dr. Moliner n° 50, 46100-Burjassot (Valencia), Spain.
M. D. Marcos
Affiliation:
UIBCM and UICM, Departament de Química Inorgánica, Facultat de Químiques, Universität de Valencia, Dr. Moliner n° 50, 46100-Burjassot (Valencia), Spain.
J. Alamo
Affiliation:
UIBCM and UICM, Departament de Química Inorgánica, Facultat de Químiques, Universität de Valencia, Dr. Moliner n° 50, 46100-Burjassot (Valencia), Spain.
A. Beltran
Affiliation:
UIBCM and UICM, Departament de Química Inorgánica, Facultat de Químiques, Universität de Valencia, Dr. Moliner n° 50, 46100-Burjassot (Valencia), Spain.
P. Beltran
Affiliation:
UIBCM and UICM, Departament de Química Inorgánica, Facultat de Químiques, Universität de Valencia, Dr. Moliner n° 50, 46100-Burjassot (Valencia), Spain.
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Abstract

Several biphasic VOP04/(VO)2P2O7 redox partners seem to be active in the catalytic cycles involved in the mild oxidation of simple hydrocarbons to maleic anhydride. The present X-ray time resolved thermal-diffractometric study reveals the existence of a new anhydrous variety of the oxidized form, ω-VOPO4, which may appear as an intermediate in the formation of the well known β-VOPO4. This new phase only remains well crystallized at relatively high temperatures, and when it is allowed to cool down in wet air VOPO4·2H2O results. In turn, another well defined phase, VOPO4·1.58H2O, can be recognized in the course of the hydration process.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 391
Copyright
Copyright © Materials Research Society 1998

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References

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