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- Title
Ionic Liquid-Silicotungstic Acid Composites as Efficient and Recyclable Catalysts for the Selective Esterification of Glycerol with Lauric Acid to Monolaurin.
- Authors
Han, Xiaoxiang; Zhang, Xiaofang; Zhu, Guangqi; Liang, Juanjuan; Cao, Xianghui; Kan, Renjun; Hung, Chin‐Te; Liu, Li‐Li; Liu, Shang‐Bin
- Abstract
The synthesis of glycerol monolaurate (GML) by the esterification of glycerol (GL) with lauric acid (LA) over a series of propyl sulfonic acid-functionalized ionic liquids (SAFILs)-modified silicotungstic acid (STA; H4SiW12O40) composite catalysts has been investigated. The synthesized organic-inorganic hybrid catalysts were characterized by different physicochemical techniques. In particular, their acidic properties were studied by solid-state 31P magic angle spinning (MAS) NMR spectroscopy by using adsorbed trimethylphosphine oxide (TMPO) as a probe. The effects of key reaction parameters, such as glycerol/lauric acid molar ratio, amount of catalyst, reaction time, and reaction temperature on LA conversion and GML product yield were elucidated and optimized with response surface methodology (RSM). The N,N-dimethyl(benzyl)ammonium propyl sulfobetaine (DMBPS)-modified STA [DMBPSH]H4SiW12O40 exhibited the optimal catalytic activity and was exploited for process optimization. A highest GML yield of 79.1% was achieved with the optimized reaction conditions. The high catalytic activity of these hybrid catalysts were attributed to strong acidity, low transport resistance, and their "pseudoliquid" characteristics. A kinetic study was made based on a second-order irreversible model of the esterification reaction, which resulted in an activation energy of 39.49 kJmol-1 for [DMBPSH]H4SiW12O40 under optimized reaction conditions.
- Subjects
IONIC liquids; CATALYSTS recycling; LAURIC acid; MONOLAURIN; ESTERIFICATION
- Publication
ChemCatChem, 2017, Vol 9, Issue 14, p2727
- ISSN
1867-3880
- Publication type
Article
- DOI
10.1002/cctc.201600788