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Start Over Author "Linmin Ye" Journal green chemistry
2 results on '"Linmin Ye"'

1. Effects of acidity and immiscibility of lactam-based Brønsted-acidic ionic liquids on their catalytic performance for esterification

Author

Haiqiang Lin, Jing Yang, Youzhu Yuan, Hancheng Zhou, and Linmin Ye

Subjects
chemistry.chemical_compound, Sulfonate, Tetrafluoroborate, Chemistry, Inorganic chemistry, Ionic liquid, Lactam, Environmental Chemistry, Organic chemistry, Selectivity, Pollution, Catalysis, Ion
Abstract

Several lactam-based Bronsted-acidic ionic liquids with different acidities were synthesized and applied to the esterification of carboxylic acids with alcohols. High conversion and perfect selectivity were obtained under mild conditions. Among the ionic liquids investigated, those having a methyl sulfonate anion (which has weaker acidity than those with a tetrafluoroborate anion) afforded the highest activity for esterification. The results indicated that the acidity and immiscibility of Bronsted-acidic ionic liquids has a synergistic effect on their esterification performance. Furthermore, after removal of water under vacuum, such ionic liquids could be reused several times without substantial loss of activity.

Published
2010
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2. PVP-stabilized heteropolyacids as reusable self-assembling catalysts for alcoholysis of cellulosic saccharides.

Author

Jin Chen, Xiaolong Fang, Xinping Duan, Linmin Ye, Haiqiang Lin, and Youzhu Yuan

Subjects
POVIDONE, ALCOHOL derivatives, CATIONS, CELLOBIOSE, IONIC liquids
Abstract

Polyvinylpyrrolidone-stabilized heteropolyacids (PVP-HPAs) are synthesized by self-assembling in alcohol. The structure of PVP-HPAs is determined by various characteristic techniques. HPAs can protonate PVP to form polymeric cations. In turn, the protonated PVP interacts strongly with the heteropolyanion by forming an ionic liquid (IL)-like structure. The self-assembling separation and recyclability characteristics are related to the PVP's IL-like structure. The catalyzing performance of PVP-HPAs varies with the species of HPA and the content of PVP. The optimized PVP-H4SiW12O40·5H2O (HSiW) (1/5 : 3/4) gives more than 60% conversion of cellulose and complete conversion of highly selective cellobiose into butylglucosides. The optimized PVP-HSiW is separated directly by centrifugation and retains the activity without any post-treatment during recycling. The deactivation of PVP-HPAs is related to the loss of the catalyst during recycling. The functional mechanism of the IL-like structure is explored in this control experiment. [ABSTRACT FROM AUTHOR]

Published
2014
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