Abstract
The metal-organic framework MOF-5 was synthesized by self-assembling of Zn(NO3)2·7H2O and H2BDC using DMF as solvent by the direct precipitation method and loaded with Fe2+ by the equivalent loading method at room temperature to prepare Fe(II)/MOF-5 catalyst and the microstructure, phases, and pore size of which was characterized by IR, XRD, SEM, TEM, and BET. It was found that Fe(II)/MOF-5 had high specific surface and porosity like MOF-5 and uniform pore distribution, and the pore size is 1.2 nm. In order to study the catalytic activity and reaction conditions of Fe(II)/MOF-5, it was used to catalyze the hydroxylation reaction of phenol with hydrogen peroxide. The results showed that the dihydroxybenzene yield of 53.2% and the catechol selectivity of 98.6% were obtained at the Fe2+ content of 3 wt.%, the mass ratio of Fe(II)/MOF-5 to phenol of 0.053, the reaction temperature of 80°C, and the reaction time of 2 h.
Highlights
Dihydroxybenzenes mainly include catechol and hydroquinone and are important organic intermediates for synthesis of carbofuran, propoxur, berberine and epinephrine, vanillin, piperonal, etc
It has been reported that the phenol conversion of these catalysts for phenol hydroxylation was usually between 40% and 60%, and the catechol selectivity was seldom more than 75% [10,11,12]
Fe(II)/Metal-organic frameworks (MOFs)-5 catalysts were prepared by equivalent loading at low temperature
Summary
Dihydroxybenzenes mainly include catechol and hydroquinone and are important organic intermediates for synthesis of carbofuran, propoxur, berberine and epinephrine, vanillin, piperonal, etc. Zheng et al [14] prepared the CD/-MOF-cat catalyst which catalyzed phenol hydroxylation with the conversion of 86% and catechol selectivity of 73.7%. As a typical representative of the metal-organic framework complex family, MOF-5 was a framework with a threedimensional structure, high specific surface, and well-defined pore structure formed by connecting an inorganic group, [Zn4O], consisting of four zinc and one O to P-phenylene dimethyl [29]. It has much higher specific surface and pore volume than activated carbon, zeolite molecular sieves, and silica. MOF-5 cannot withstand high temperature above 400°C [45], so Fe(II)/MOF-5 was prepared by equivalent loading of Fe2+ at low temperature [46] and used to catalyze hydroxylation of phenol by hydrogen peroxide in order to study the performance of the Fe(II)/MOF-5 catalyst and technological conditions of hydroxylation of phenol by hydrogen peroxide
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