Optimization of the synthesis of SBA-3 mesoporous materials by experimental design
Date
2016-02-18
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier Inc.
Abstract
SBA-3 mesoporous materials are characterized by hexagonal regular
arrangements of channels with diameters >2 nm, high specific surface
areas and high specific pore volumes. In the work reported herein,
experimental design-response surface methodology (RSM) is used to
model and optimize the synthesis conditions for SBA-3 mesoporous
materials. In this study, we evaluate the influences of surfactant/silica
source molar ratios, aging times, temperature and pH on the synthesis
of SBA-3 mesoporous materials by analyzing the XRD intensities
pertaining to the [100] signal. Response surfaces were obtained using
the BoxeBehnken design, and the combination of reaction parameters
was optimized. By applying statistical methodology, higher levels of the
objective function (XRD intensities pertaining to the [100] signal) were
obtained using cetyltrimethylammonium bromide (CTAB)/tetraethyl
orthosilicate (TEOS) molar ratios of
0.07 and 0.16, HCl/TEOS molar ratios of 8 and 11, reaction temperatures
of 35 and 45 ◦C and aging times
of 12e24 h. The mesoporous SBA-3 samples obtained were
characterized using small-angle X-ray powder diffraction (XRD), BET,
FTIR and 29Si NMR-MAS, scanning electron microscopy (SEM) and
transmission electron microscopy (TEM).
Description
Keywords
Synthesis SBA-3, Design-response surface, Optymal synthesis conditions
Citation
Endorsement
Review
Supplemented By
Referenced By
Creative Commons license
Except where otherwised noted, this item's license is described as info:eu-repo/semantics/openAccess