Collect. Czech. Chem. Commun. 1992, 57, 756-766

Kinetic Aspects of the Crystallization of SAPO-5 Molecular Sieves

Jan Kornatowskia,b, Beate Kanz-Reuschelc, Gerd Fingerd, Werner H. Baura, Martin Bülowd and Klaus K. Ungerc

a Institut für Kristallographie und Mineralogie, J. W. Goethe-Universitat, D(W)-6000 Frankfurt/Main, Germany
b On leave from Instytut Chemii, Uniwersytet M. Kopernika, PL-87-100 Toruń, Poland
c Institut für Anorganische und Analytische Chemie, J. Gutenberg-Universitat, D(W)-6500 Mainz, Germany
d Zentralinstitut für Physikalische Chemie, D(O)-1199 Berlin, Germany


The kinetics of hydrothermal crystallization of microporous silicoaluminophosphate SAPO-5 have been studied as a function of water content using the templates tripropylamine (TPA) and triethylamine (TEA). The investigation included the formation of the SAPO-5 phase, its growth in large single crystals, and the size distribution of the crystals. An attempt to fit the experimental data to kinetic models of crystallization is presented. The systems studied have been found to be very similar except for the nucleation stage which is mainly responsible for both the dimensions of the resulting crystals and for the purity of the SAPO-5 phase.