An Al3+-based metal-organic framework (MOF), CAU-11-COOH, with a V-shaped ligand, DPSDA (3,3′-4,4′-diphenylsulfonetetracarboxylic dianhydride), was prepared using the solvothermal method, and was characterized using powder X-ray diffraction, Fourier transform
infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, elemental analysis, thermogravimetric analysis, Brunauer-Emmett-Teller analysis, and CO2 adsorption. The catalytic efficiency of CAU-11-COOH was investigated in the solvent-free cycloaddition
of carbon dioxide with epoxides, which yielded five-membered cyclic carbonates under mild reaction conditions. CAU-11-COOH with a co-catalyst, tetrabutylammonium bromide (TBAB), gave higher than 98% yield of epichlorohydrin carbonate at 80 °C without a solvent. A plausible reaction mechanism
in which the Lewis acidic metal center, an uncoordinated carboxyl group, and a nucleophilic bromide anion operate synergistically is proposed. The CAU-11-COOH catalysts were found to exhibit high thermal stability and could be reused more than four times without any significant reduction in
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Document Type: Research Article
School of Chemical and Biomolecular Engineering, Pusan National University, Busan 609-735, Korea
Brain Korea 21 Center of Chemical Engineering, Pusan National University, Busan 609-735, Korea
Publication date: February 1, 2020
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