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• W2019431387 abstract "Catalytic activity of 14 types of metal ion-exchanged montmorillonite K-10 clay (Mn+-mont) is tested for the acetylation of cyclohexanol with acetic anhydride at room temperature. The activity increases with an increase in the charge/radius ratio of exchanged cation. The activity of Fe3+-mont is the highest and is higher than those of other Fe3+ catalysts, FeCl3·6H2O and FeCl3/SiO2, conventional acid catalysts, Al2O3 and HZSM5, and homogeneous Lewis acid, Sc(OTf)3. Fe3+-mont exhibits a high turnover numbers (TON = 49,500) and can be recycled without a loss in activity. Acidity of Fe3+-mont, Yb3+-mont and FeCl3/SiO2 was characterized by IR spectroscopy using three probe molecules: pyridine, acetonitrile and acetone. These catalysts dominantly act as Lewis acid, and the Lewis acid strength changes in the order of Fe3+-mont > Yb3+-mont > FeCl3/SiO2, as suggested by acetone adsorption microcalorimety. From the relationship between the activity and the acidic character, factors affecting the catalytic activity for the acetylation are discussed." @default.
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• W2019431387 date "2008-04-01" @default.
• W2019431387 modified "2023-09-27" @default.
• W2019431387 title "Characterization of Lewis acidity of cation-exchanged montmorillonite K-10 clay as effective heterogeneous catalyst for acetylation of alcohol" @default.
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• W2019431387 doi "https://doi.org/10.1016/j.molcata.2008.01.013" @default.
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