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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

REFERENCES

1 Centi, G., Trifiro, F., Ebner, J.R. and Franchetti, V. M., V. M. Chem. Rev. 88, 55 (1988).Google Scholar
2 Centi, G., (Ed.) Special Issue of Catalysis Today 16 (1993).Google Scholar
3 Beltrán, D., Beltrán, A., Amorós, P., Ibáñez, R., Martínez, E., Le Bail, A., Ferey, G. and Villeneuve, G., Eur. J. Solid State Inorg. Chem. 28, 131 (1991) and references therein.Google Scholar
4 Hodnett, B. K., Catal. Rev.-Sci. Eng. 27, 373 (1985).Google Scholar
5 Bordes, E., Catalysis Today 16, 27 (1993); 3, 163 (1988); 1, 499 (1987).Google Scholar
6 Ebner, J. R. and Thompson, M. R., Catalysis Today 16, 51 (1993).Google Scholar
7 Bordes, E. and Courtine, P., J. Catal. 57, 236 (1979); Chem. Commun. 1985. 293.Google Scholar
8 Amorós, P., Ibáñez, R., Martínez, E., Beltrán, A., Beltrán, D. and Villeneuve, G., Mat. Res. Bull. 24, 1347 (1989).Google Scholar
9 Amorós, P., Ibáñez, R., Beltrán, A., Beltrán, D., Fuertes, A., Gómez-Romero, P., Hernández, E. and Rodríguez-Carvajal, J., Chem. Mat. 3, 407 (1991).Google Scholar
10 Amorós, P., Beltrán, D., Le Bail, A., Ferey, G. and Villeneuve, G., Eur. J. Solid State Inorg. Chem. 25, 599 (1988). F. Preuss and H. Schug, Z. Naturforsch Teil B 30, 334 (1975).Google Scholar
11 Epple, U.M. and Cammenga, H. K., Ber. Bunsenges. Phys. Chem. 96, 1774 (1992).Google Scholar
12 Torardi, C. C. and Calabrese, J. C., Inorg. Chem. 23, 1308 (1984).Google Scholar
13 Jordan, B. D. and Calvo, C., Acta Crystallogr. B 32, 2899 (1976).Google Scholar
14 Gopal, R. and Calvo, C., J. Solid State Chem. 5, 432 (1972).Google Scholar
15 Werner, P. E., Kristallogr. 120, 375 (1969); R. G. Garvey, Least Squares Unit Cell Refinement Program, Department of Chemistry, North Dakota State University, 1973.Google Scholar
16 Hazen, M. and Finger, L. W., Comparative Crystal Chemistry. (John Wiley & Sons, New York, 1982).Google Scholar
17 Casañ, N., Amorós, P., Ibáñez, R., Martínez, E., Beltrán, A., Beltrán, D. J. Inclusin Phenomena 6, 193 (1988).Google Scholar
18 Matsuura, I., Catalysis Today 16, 123 (1993).Google Scholar