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The direct oxidative esterification of methacrolein (MAL) with methanol in the presence of molecular O 2 at low temperature and ambient pressure to methyl methacrylate (MMA) was carried out over a novel hydrophobic styrene-divinyl benzene copolymer (SDB) supported palladium catalyst, and the results were compared with conventional hydrophilic catalysts over SiO 2 and γ-Al 2 O 3 . Among the catalysts studied, SDB supported palladium catalyst showed higher activity than the conventional catalysts. The Pd/SDB catalyst was characterized by X-ray powder diffraction (XRD), environmental scanning electron microscope (ESEM), and thermal gravimetric analysis (TGA). A systematic investigation was carried out for the oxidative esterification of MAL with methanol over SDB supported catalyst. The effects of catalyst loading and alcohol/aldehyde molar ratio were studied. The reaction kinetics was studied, and the result showed that the fitting results agreed well with the experimental data. On the basis of the Langmuir–Hinshelwood adsorption model, the probable mechanism was suggested.
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Wang et al. (2012) studied this question.
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