Abstract
Layer by layer metal-organic framework (MOF) supported on zirconium phosphate (ZrP) was synthesized at very mild conditions and used for the liquid phase oxidation of cyclohexene in solvent free condition in the presence of molecular oxygen. The MOF-ZrP was characterized by X-ray diffractometer (XRD), scanning electron microscope (SEM), thermal gravimetric analyzer (TGA), Fourier-transform infrared spectrometer (FT-IR) and Brunauer-Emmett-Teller (BET) surface area analyzer. The characterization shows a smooth morphology of MOF-ZrP with good stability under 200 °C having surface area 285 m2/g. The catalytic activity of the MOF-ZrP revealed that increase of layers of MOF on ZrP enhances conversion, as well as selectivity of oxidation of cyclohexene. DFT studies were used to explore the structure and electron properties of HKUST-1 (Hong Kong University of Science and Technology), which is a clue for the catalytic behavior of the catalyst.
Highlights
Oxyfunctionalization of hydrocarbons is a fundamental reaction in organic chemistry and industry.The oxygenated products of hydrocarbons are key intermediates in valued fine chemicals
Copper-metal-organic framework (MOF) with triazolyl isopthalate linkers for oxidation of cyclohexene where the three major products were obtained with tertiary butyl hydroperoxide (TBHP) after
All the reactions were carried out for 24 h in order to check the catalytic activity of MOF-zirconium phosphate (ZrP) for each substrate oxidation
Summary
Oxyfunctionalization of hydrocarbons is a fundamental reaction in organic chemistry and industry. Cyclohexenone and cyclohexene oxide were obtained with 49% conversion in 7 h. Copper-MOF (metal-organic framework) with triazolyl isopthalate linkers for oxidation of cyclohexene where the three major products were obtained with tertiary butyl hydroperoxide (TBHP) after. Zhang et al reported α-ZrP catalyst for synthesis of stearic acid monoethanolamide where conversion was 92.9% after 12 h of reaction at 120 ◦ C [18]. Catalysts 2018, 8, x FOR PEER REVIEW was 18.04% and 26.71% respectively, where products were cyclohexenol, cyclohexenone and cyclohexene oxide [22,23]. We report the catalytic activity of HKUST-1 supported on zirconium phosphate in the liquid phase oxidation of cyclohexene in solvent free free conditions conditions with with molecular molecular oxygen
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