Influence of synthesis conditions on morphological features of the SBA-15 containing only elongated and rounded/spherical grains (original) (raw)
2018, Science of Sintering
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SBA-15 samples were prepared by using Plackett-Burman experimental design, and the effects of different parameters on the structural and textural properties of samples were investigated by using the statistical method. The application of Daniel method showed that using 1, 3, 5-triisopropylbenzene (TIPB) and NH 4 F and increasing aging temperature were the most effective parameters on the pore diameter of the synthesis samples. Moreover, increasing initial synthesis temperature and adjusting of the amount of TIPB afforded Barret-Joyner-Halenda pore diameter and total pore volume up to 24.4 nm and 1.93 cm 3 /g, respectively, with an appropriate degree of structural ordering.
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Conventional SBA-15: The synthesis of conventional SBA-15 materials was synthesized according to the procedure reported in the literature. The template solution was prepared dissolving 4g of Pluronic® P123 (BASF Corporation) in 138 mL of deionized water and 10.3 mL of HCl (37 wt%) under magnetic stirring. When the surfactant was completely dissolved, 8.2 mL of TEOS were added to the template solution to yield a molar composition of 1.0 Si(OEt) 4 : 0.017 P123 : 3.4 HCl :208.3 H 2 O. The resulting mixture was kept under magnetic stirring for 12 h at 308 K in a sealed Teflon container and subsequently aged at 373 K for 24 h. Solid silica particles were then filtered, washed with deionized water and dried at 333 K for 12h. The thermal treatment was carried out at 823 K under N 2 flow for 2h and then under atmospheric air for further 2 h to remove the surfactant.
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