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- W2896925455 abstract "Several HSO3-functionalized halloysite nanotubes (HSO3-HNTs) were prepared by different methodologies including one-pot organosilylation or sulfonation and two-step organosilylation followed by sulfonation or oxidation. Their physicochemical characterization confirmed the success of HSO3-functionalization with S contents and acidity up to 1.61 mmol S/g and 3.67 mmol H+/g. All HSO3-HNTs were tested as acid catalysts in the esterification of free fatty acids (FFAs) mixture as hybrid feedstock model. Materials obtained from one-pot organosilylation or sulfonation and from two-steps involving sulfonation were the most active showing almost 100% conversion after 3 h: the one obtained by direct sulfonation exhibited the highest TOF (94 h−1) and mass normalized activity (0.08 mol g−1 h−1), whereas that obtained by one-pot organosilylation showed the highest stability and reusability. The increase of FFA carbon chain length led higher conversions, showing the prevalence of inductive effect and absence of steric effects on the esterification mechanism using these new HSO3-HNTs catalysts." @default.
- W2896925455 created "2018-10-26" @default.
- W2896925455 creator A5012121744 @default.
- W2896925455 creator A5012254846 @default.
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- W2896925455 date "2018-11-01" @default.
- W2896925455 modified "2023-10-11" @default.
- W2896925455 title "HSO3-functionalized halloysite nanotubes: New acid catalysts for esterification of free fatty acid mixture as hybrid feedstock model for biodiesel production" @default.
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- W2896925455 doi "https://doi.org/10.1016/j.apcata.2018.10.008" @default.
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