Dual Sulfonic Acid Functionalized Heteropolyacid-Based Ionic Liquids for Esterification of Glycerol Toward Triacetylglycerol

Transformations of Glycerol into High-Value-Added Chemical Products: Ketalization and Esterification Reactions

“…Finally, Guang et al synthesized ionic liquids based on heteropolyacids functionalized with sulfonic acid. The results indicated that the [BS 2 TMEDA]HPW 12 O 40 catalyst exhibited the highest catalytic activity and selectivity over TAG compared to the commercial catalysts H 3 PW 12 O 40 , H 2 SO 4 and Amberlyst 15, and this result was attributed to its higher average acidity of the -SO3H groups and carbon chain length [71].…”

Preparation of a heteropoly acid ionic liquid and its application in the catalytic degradation of bottle-grade PET

“…[12][13][14][15][16][17][18][19][20][21][22] Heteropoly acids are polyoxometalates bridged by hetero atoms and polyatomic atoms through oxygen atom coordination in a certain structure, and they are green dual-functional catalysts with both acid-base and oxidation-reduction properties. [23][24][25][26][27][28] Heteropoly acids can be combined with ionic liquids by ion exchange to prepare heteropoly acid ionic liquid catalysts, [29][30][31][32][33] so that a reversible phase transformation may be realized, 34,35 which means a uniform system can be formed at a high reaction temperature, and two-phase separation can be made by reducing the temperature after the reaction, to facilitate recycling. 36,37 To sum up, in this study, titanium-centered heteropoly acid salts with different metal vacancies were prepared first and then combined with 1-butyl-3-methylimidazolium chloride by ion exchange to obtain heteropoly acid ionic liquids.…”