Abstract
Amino-functionalized MCM-41 was synthesized via direct condensation, as well as post-grafting, using 3-aminopropyltrimethoxysilane as the functionalization agent. Keggin and Preyssler-structured heteropolyacids (HPAs) were anchored on the surface of amino-functionalized MCM-41 by chemically bonding to amino groups. HPAs directly supported on MCM-41 by impregnation were also prepared for comparison. These catalysts were characterized by Infra-red spectroscopy, X-ray diffraction, N2-adsorption, Hammett indicator and UV–Vis spectroscopy, and evaluated in esterification of n-butanol with acetic acid. HPAs anchored on amino-functionalized MCM-41 via condensation give very stable and substantially higher activity than the ones via grafting. In contrast, MCM-41 supported HPA catalysts prepared by direct impregnating lose their catalytic activities rapidly due to the leaching of HPA active sites. The catalyst activity is discussed in relation with physicochemical properties.
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The authors thank Jiangsu Provincial Key Natural Science Foundation for Universities (06KJA53012), Jiangsu Provincial Science and Technology Innovation Program Foundation for Graduate Students (CX08B-114Z), and National Natural Science Foundation of China (Nos. 20476046 and 20776069).
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Wu, S., Liu, P., Leng, Y. et al. Heteropolyacids Anchored on Amino-Functionalized MCM-41 via Condensation as Reusable Catalysts for Esterification. Catal Lett 132, 500–505 (2009). https://doi.org/10.1007/s10562-009-0123-8
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DOI: https://doi.org/10.1007/s10562-009-0123-8