Abstract
Al-containing SBA-16 (with different Si/Al molar ratios) was prepared by an easy post-grafting method using F127 as structure-directing agent and aluminum isopropoxide as Al source. The structure of the solid catalyst was fully characterized by X-ray diffraction (XRD) analysis, N2 adsorption, scanning electron micrographs (SEM), transmission electron micrographs (TEM) and 27Al MAS NMR. The results indicated that the materials possess three-dimension caged-like mesostructure and Al was successfully incorporated into the SBA-16 framework. The acid properties have been estimated by FT-IR of pyridine adsorption (Py-IR). Among various Si/Al ratios, Al/SBA-16 with Si/Al ratio 20 performed good catalytic activity for the tert-butylation of phenol. Compared to hexagonal mesoporous Al/SBA-15, Al/SBA-16 showed higher catalytic properties due to its cage-like mesostructure, which could make the active acid sites more accessible to the reactant.
Graphical Abstract
The catalytic activity of the Al/SBA-16 with 3D cubic structure is higher than hexagonal mesoporous silica Al/SBA-15. The incorporation of Al into SBA-16 with molar ratio of 20 exhibit high catalytic activity for tert-butylation of phenol.
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Acknowledgment
The authors thank the National Natural Science Foundation of China (No. 50675045) and the New Century Excellent Talent (No. NCET-08-0165) for financial support.
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Ma, J., Qiang, L., Wang, J. et al. An Easy Route to Synthesize Novel Mesostructured Silicas Al/SBA-16 and Its Catalytic Application. Catal Lett 141, 356–363 (2011). https://doi.org/10.1007/s10562-010-0494-x
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DOI: https://doi.org/10.1007/s10562-010-0494-x