Journal
CHEMCATCHEM
Volume 7, Issue 3, Pages 441-449Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201402800
Keywords
biodiesel; encapsulation; heterogeneous catalysis; ionic liquids; metal-organic frameworks
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Funding
- National Natural Science Foundation of China [21176121, 21476110]
- Key Project for University Natural Science Foundation of Jiangsu Province [14KJA530001]
- State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University [ZK201305]
- Research Innovation Training Project for Graduate Students of Jiangsu Province [KYZZ_0227]
- Practice and Innovation Training Project for College Students of Jiangsu Province [201410291041Z]
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A new strategy was proposed to construct the ionic liquid, polyoxometalate (POM), and metal-organic framework (MOF) composite. The POM-based MOF was synthesized by using the direct hydrothermal method. The sulfonic acid group-functionalized ionic liquid was used for further modification of the hybrid material to realize the encapsulation of the heteropolyanion-based ionic liquid within the cages of the MOF. The catalysts were characterized by using XRD, N-2 adsorption-desorption, FTIR, SEM, TEM, elemental analysis, and TGA. The results indicated that the heteropolyanion-based ionic liquid had been successfully encapsulated within the cages and the structure of MIL-100 (MIL=Materials of Institut Lavoisier) remained intact. The POM-ionic-liquid-functionalized MOF, with high content of the active component, had both Lewis and BrOnsted acid sites, which led to high catalytic activity for the esterification of oleic acid with ethanol. The esterification reaction conditions were optimized by using response surface methodology (RSM), and the corresponding conversion of oleic acid reached 94.6%. The catalyst could be easily recovered and reused six times without significant loss of activity.
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