Hostname: page-component-cd9895bd7-mkpzs Total loading time: 0 Render date: 2024-12-23T20:35:13.408Z Has data issue: false hasContentIssue false
  • English
  • Français

Water-vapor-induced transformation of two-dimensional vanadyl hydrogen phosphate hemihydrate, VOHPO4·0.5H2O, to one-dimensional tetrahydrate, VOHPO4·4H2O

Published online by Cambridge University Press:  01 November 2004

Soumen Dasgupta ,
Monika Agarwal  and
Arunabha Datta
Soumen Dasgupta
Affiliation:
Indian Institute of Petroleum, Dehra Dun-248005, India
Monika Agarwal
Affiliation:
Indian Institute of Petroleum, Dehra Dun-248005, India
Arunabha Datta*
Affiliation:
Indian Institute of Petroleum, Dehra Dun-248005, India
*
a)Address all correspondence to this author. e-mail: [email protected]
Get access

Abstract

The catalytically important, two-dimensional vanadyl hydrogen phosphate hemihydrate, VOHPO4·0.5H2O phase was transformed to the one-dimensional vanadyl hydrogen phosphate tetrahydrate, VOHPO4·4H2O for the first time by mild treatment with water vapor. It was also observed that for three samples of VOHPO4·0.5H2O prepared under different conditions, the rate of transformation to the tetrahydrate was markedly affected by morphology and crystallinity. The tetrahydrate phase could also be re-transformed to the hemihydrate by applying high vacuum or by heating at 120 °C, but this was accompanied by significant loss in crystallinity.

Keywords

Phase transformation
Type
Rapid Communications
Information
Journal of Materials Research , Volume 19 , Issue 11 , November 2004 , pp. 3131 - 3134
Copyright
Copyright © Materials Research Society 2004

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1Cheetham, A.K., Férey, G. and Loiseau, T.: Open-framework inorganic materials. Angew. Chem. Int. Ed. 38, 3268 (1999).3.0.CO;2-U>CrossRefGoogle ScholarPubMed
2Rao, C.N.R.: Novel materials, materials design and synthetic strategies: Recent advances and new directions. J. Mater. Chem. 9, 1 (1999).CrossRefGoogle Scholar
3Cao, G., Hong, H.G. and Mallouk, T.E.: Layered metal phosphates and phosphonates: From crystals to monolayers. Acc. Chem. Res. 25, 420 (1992).CrossRefGoogle Scholar
4Rao, C.N.R., Natarajan, S., Chaudhary, A., Neeraj, S. and Ayi, A.A.: Aufbau principle of complex open-framework structures of metal phosphates with different dimensionalities. Acc. Chem. Res. 34, 80 (2001).CrossRefGoogle ScholarPubMed
5Muller, A., Reuter, H. and Dillinger, S.: Supramolecular inorganic chemistry: Small guests in small and large hosts. Angew. Chem. Int. Ed. 34, 2328 (1995).CrossRefGoogle Scholar
6Feng, S. and Xu, R.: New materials in hydrothermal synthesis. Acc. Chem. Res. 34, 239 (2001).CrossRefGoogle ScholarPubMed
7Shimoda, T., Okuhara, T. and Misono, M.: Preparation of vanadium-phosphorus mixed oxide (P/V=1) catalysts and their application to oxidation of butane to maleic anhydride. Bull. Chem. Soc. Jpn. 58, 2163 (1985).CrossRefGoogle Scholar
8Busca, G., Cavani, F., Centi, G. and Trifiro, F.: Nature and mechanism of formation of vanadyl pyrophosphate: Active phase in n-butane selective oxidation. J. Catal. 99, 400 (1986).CrossRefGoogle Scholar
9Kiely, C.J., Burrows, A., Sajip, S., Hutchings, G.J., Sannanes, M.T., Tuel, A. and Volta, J.C.: Characterization of variations in vanadium phosphate catalyst microstructure with preparation route. J. Catal. 162, 31 (1996).CrossRefGoogle Scholar
10Datta, A., Saple, A.R. and Kelkar, R.Y.: An investigation of the variation of the morphology of the catalyst precursor (VO)2H4P2O9 with the medium of preparation. J. Mater. Sci. Lett. 11, 930 (1992).CrossRefGoogle Scholar
11Guliants, V.V., Benziger, J.B., Sundaresan, S., Wachs, I.E., Jehng, J.M. and Roberts, J.E.: The effect of the phase composition of model VPO catalysts for partial oxidation of n-butane. Catal. Today 28, 275 (1996).CrossRefGoogle Scholar
12Johnson, J.W., Johnston, D.C., Jacobson, A.J. and Brody, J.F.: Preparation and characterization of VO(HPO4)·0.5H2O and its topotactic transformation to (VO)2P2O7. J. Amer. Chem. Soc. 106, 8123 (1984).CrossRefGoogle Scholar
13Leonowicz, M.E., Johnson, J.W., Brody, J.F., Shannon, H.F.Jr., and Newsam, J.M.: Vanadyl hydrogenphosphate hydrate: VO(HPO4)·4H2O and VO(HPO4)·0.5H2O. J. Solid State Chem. 56, 370 (1985).CrossRefGoogle Scholar