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http://dx.doi.org/10.5012/bkcs.2013.34.5.1481

Bifunctional Fe-SBA-15-SO3H Mesoporous Catalysts with Different Si/Fe Molar Ratios: Synthesis, Characterization and Catalytic Activity  

Erdem, Sezer (Department of Physics, Faculty of Science and Arts, Uludag University)
Erdem, Beyhan (Department of Chemistry, Faculty of Science and Arts, Uludag University)
Oksuzoglu, Ramis Mustafa (Department of Material Science and Engineering, Faculty of Engineering, Anadolu University)
Citak, Alime (Department of Chemical Engineering, Eskisehir Osmangazi University)
Publication Information
Bulletin of the Korean Chemical Society / v.34, no.5, 2013 , pp. 1481-1486 More about this Journal
Abstract
Bifunctional Fe-SBA-15-$SO_3H$ mesoporous materials with different Si/Fe molar ratios (3, 5, and 7) have been synthesized via a simple direct hydrothermal method and characterized by XRD, $N_2$-adsorption/desorption, TG/DTG and FT-IR techniques, and used as solid acid catalysts in the esterification of lactic acid with methanol. XRD and $N_2$ sorption characterizations show successful iron doping within the mesoporous channels of SBA-15-$SO_3H$. The FT-IR and TG/DTG characterizations also reveal the presence of iron. With the incorporation of Fe ions into the SBA-15-$SO_3H$, the acid sites substantially increased because of the self-separated acidity of the hydrolysis of $Fe^{3+}$ solutions. However, in the Si/Fe = 3 molar ratio, the catalytic conversion decreased which is caused by the reduced cooperation effect between the acid pairs due to the weakened hydrogen bonds and collapse of the pore structure. This further suggests that the mesoporous structure decreases with the decrease in Si/Fe ratio.
Keywords
Esterification; Lactic acid; Fe-SBA-15-$SO_3H$; Mesoporous catalysts;
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