Skip to main content Accessibility help
×
Home

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

  • P. Amoros (a1), M. D. Marcos (a1), J. Alamo (a1), A. Beltran (a1) and P. Beltran (a1)...

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.

Copyright

References

Hide All
1 Centi, G., Trifiro, F., Ebner, J.R. and Franchetti, V. M., V. M. Chem. Rev. 88, 55 (1988).
2 Centi, G., (Ed.) Special Issue of Catalysis Today 16 (1993).
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.
4 Hodnett, B. K., Catal. Rev.-Sci. Eng. 27, 373 (1985).
5 Bordes, E., Catalysis Today 16, 27 (1993); 3, 163 (1988); 1, 499 (1987).
6 Ebner, J. R. and Thompson, M. R., Catalysis Today 16, 51 (1993).
7 Bordes, E. and Courtine, P., J. Catal. 57, 236 (1979); Chem. Commun. 1985. 293.
8 Amorós, P., Ibáñez, R., Martínez, E., Beltrán, A., Beltrán, D. and Villeneuve, G., Mat. Res. Bull. 24, 1347 (1989).
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).
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).
11 Epple, U.M. and Cammenga, H. K., Ber. Bunsenges. Phys. Chem. 96, 1774 (1992).
12 Torardi, C. C. and Calabrese, J. C., Inorg. Chem. 23, 1308 (1984).
13 Jordan, B. D. and Calvo, C., Acta Crystallogr. B 32, 2899 (1976).
14 Gopal, R. and Calvo, C., J. Solid State Chem. 5, 432 (1972).
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.
16 Hazen, M. and Finger, L. W., Comparative Crystal Chemistry. (John Wiley & Sons, New York, 1982).
17 Casañ, N., Amorós, P., Ibáñez, R., Martínez, E., Beltrán, A., Beltrán, D. J. Inclusin Phenomena 6, 193 (1988).
18 Matsuura, I., Catalysis Today 16, 123 (1993).

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

  • P. Amoros (a1), M. D. Marcos (a1), J. Alamo (a1), A. Beltran (a1) and P. Beltran (a1)...

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed