THE INFLUENCE OF GEL PROPERTIES ON THE KINETICS OF CRYSTALLIZATION AND PARTICULATE PROPERTIES OF MFI-TYPE ZEOLITES - I - THE INFLUENCE OF TIME AND TEMPERATURE OF GEL AGING ON THE PARTICULATE PROPERTIES OF SILICALITE-1 MICROCRYSTALS

Authors
CIZMEK A SUBOTICA B KRALJ D BABICIVANCIC V TONEJC A
Citation
A. Cizmek et al., THE INFLUENCE OF GEL PROPERTIES ON THE KINETICS OF CRYSTALLIZATION AND PARTICULATE PROPERTIES OF MFI-TYPE ZEOLITES - I - THE INFLUENCE OF TIME AND TEMPERATURE OF GEL AGING ON THE PARTICULATE PROPERTIES OF SILICALITE-1 MICROCRYSTALS, Microporous materials, 12(4-6), 1997, pp. 267-280
Citations number
50
Journal title
Microporous materials → ACNP
ISSN journal
09276513
Volume
12
Issue
4-6
Year of publication
1997
Pages
267 - 280
Database
ISI
SICI code
0927-6513(1997)12:4-6<267:TIOGPO>2.0.ZU;2-7
Abstract
The influence of time and temperature of ageing of the amorphous gel p recursor (2.5Na(2)O-8TPABr-60SiO(2)-800H(2)O) on the particulate prope rties (particle size distribution, particle shape, number of particles ) of silicalite-l synthesized at 170 degrees C were studied by differe nt experimental methods such as X-ray diffractometry (XRD), differenti al thermogravimetric analysis (TGA), particle size analysis, FT infra- red spectroscopy and scanning-electron microscopy (SEM). In spite of n egligible changes in the crystal morphology, ageing of the gel conside rably affects the number and size of silicalite-l crystals in the crys talline end products. The observed effects were discussed in terms of the formation of specific ordered subunits between silicate species an d TPA(+) ions (germ nuclei) and their role in the nucleation and cryst al growth of silicalite-l crystals. (C) 1997 Elsevier Science B.V.