Non Conventional Synthesis of Monoclinic Celsian from Ba-Exchanged Zeolite A: Study of the Effect of Residual Na and Forming Pressure

Abstract:

Four samples of Ba-exchanged zeolite A, bearing 0.27, 0.43, 0.58 and 0.74 meq/g Na residual amounts, were thermally treated in the temperature range 200-1500 °C for times up to 28 hours. The same samples were pressed at 30 and 60 MPa to manufacture cylindrical pellets, which were thermally treated at 1300 °C for 5 hours. Thermally treated materials were characterized by room temperature XRD. The sequence of thermal transformations that Ba-exchanged zeolite A undergoes (zeolite ® amorphous phase ® hexacelsian ® monoclinic celsian) and the strong mineralizing action developed by Na are confirmed. Pressing the Ba-exchanged zeolite A powder-like samples to obtain cylindrical pellets is found to expedite the sluggish final phase transition hexacelsian ® monoclinic celsian. The optimum residual Na content of Ba-exchanged zeolite A to be transformed into monoclinic celsian is assessed to range between 0.27 and 0.43 meq/g.

• Periodical: Advances in Science and Technology (Volume 45)
• Pages: 963-968
• DOI: https://doi.org/10.4028/www.scientific.net/AST.45.963
• Online since: October 2006
• Authors: C. Ferone, M. Pansini, Fernandanora Andreola, Luisa Barbieri, Cristina Siligardi, Tiziano Manfredini
• Keywords: Celsian, Ceramic, Microporous Material, Phase Transactions, Structural Materials, Thermal Transformation

References

[1] I. G. Talmy, D. A. Haught, and E. J. Wuchina, in Proceedings of the 6th International SAMPE Electronic Conference. Edited by A. B. Goldberg, C. A. Harper, M. S. Schroeder and M. A. Ibraham Society for the Advancement of Materials and Process Engineering, Covina, CA USA, 1992, 687.

[2] N. P. Bansal, and C. H. Drummond III, J. Am. Ceram. Soc. 76.

[5] (1993) 1321.

[3] N. P. Bansal, J. Mater. Sc. 33 (1998) 4711.

[4] G. Dell'Agli, C. Ferone, M. C. Mascolo, and M. Pansini, Solid State Ionics 127 (2000) 309.

[5] H. C. Lin, and W. R. Foster, Am. Mineralogist 53 (1962) 134.

[6] G. Dell'Agli, C. Ferone, M. C. Mascolo, and M. Pansini, Chem. Mat. 14 (2002) 797.

[7] A. Aronne, S. Esposito, C. Ferone, M. Pansini, and P. Pernice, J. Mat. Chem. 12 (2002) 3039.

[8] S. Esposito, C. Ferone, M. Pansini, L. Bonaccorsi, E. Proverbio, J. Eur. Ceram. Soc. 24 (9) (2004) 2689.

[9] N. Clayden, S. Esposito, C. Ferone, M. Pansini, J. of Mat. Chem. 13 (2003) 1681.

[10] C. Ferone, S. Esposito, G. Dell'Agli, M. Pansini, Sol. St. Sc. 7 (2005) 1406.

[11] J. S. Reed, Introduction to the principle of ceramic processing, Wiley & sons: New York, NY, (1988).