Effect of excess silicate on the structure formation and textural properties of MTS materials |
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| Authors: | Alexandra Inayat Andreas Kuhnt Wilhelm Schwieger Wolf-Dietrich Einicke Jens Kullmann Dirk Enke |
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| Affiliation: | 1.Chair of Chemical Reaction Engineering,University Erlangen-Nuremberg,Erlangen,Germany;2.Institute of Technical Chemistry,University Leipzig,Leipzig,Germany |
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| Abstract: | The synthesis of micellar templated silica (MTS) materials has been conducted with different SiO2/CTAB molar ratios for two different cetyltrimethylammoniumbromide (CTAB) concentrations of 0.02 and 0.07 M to examine the
structure formation for cubic (SBA-1) as well as for hexagonal (SBA-3) surfactant arrangement in acidic reaction medium with
increasing silicate excess. Reaction products were analyzed with X-ray diffraction, N2 physisorption and TG-MS. It was found that an increase of the silicate concentration leads to the formation of additional
silica gel in the resulting MTS material, which causes not only a decrease of specific surface area and pore volume, but also
of the mesopore diameter. The latter effect is explained by a proposed embedding theory. Furthermore, with increasing silicate
content in the synthesis mixture a phase transformation from hexagonal to cubic pore arrangement was found for the CTAB concentration
of 0.07 M and the maximum SiO2/CTAB molar ratio for ordered pore arrangement has been determined. |
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