Preparation and Characterization of Nanoscales α-Fe2O3/Microporous resin Catalyst and the Application in Hydroxylation of Phenol with H2O2 to Dihydroxybenzene

Abstract

Abstract: The nanoscales α-Fe₂O₃ /microporous resin catalyst was prepared by the ion exchange method and characterized by means of X-ray diffraction(XRD), transmission electron microscopy(TEM) and Mssbauer spectroscopy. The uses of these techniques make it possible to perform an estimation of the size of the iron oxide crystallites on microporous resin. The size of the crystallites has been found to be smaller than₅ nm. The catalyst prepared exhibited a very good catalytic activity on the hydroxylation of phenol with H₂O₂ to dihydroxybenzene. The effect conversion of phenol reached 22.4% when phenol/H₂O₂(molar ratio) is 3 and the ratio of catechol and hydroquinone is about 1.4 in the products. The results didn't change when the reaction was magnified to 3000 times. Furthermore, compared α-Fe₂O₃ /microporous resin with α-Fe₂O₃ prepared from chemical precipitation, it was thought that the reason of different hydroxylation activity of phenol between the two kinds of catalysts was the size of particles in nature.

Key words: α-Fe₂O₃/microporous resin, Phenol, Hydroxylation with H₂O₂, Dihydroxybenzene

CLC Number:

O643

TrendMD:

LIU Qing-Sheng, YU Jiang-Feng, YE Qiu-Shi, FU Ying-Huan, XU Ning, WU Tong-Hao . Preparation and Characterization of Nanoscales α-Fe₂O₃/Microporous resin Catalyst and the Application in Hydroxylation of Phenol with H₂O₂ to Dihydroxybenzene[J]. Chem. J. Chinese Universities, 2002, 23(2): 259.

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Preparation and Characterization of Nanoscales α-Fe₂O₃/Microporous resin Catalyst and the Application in Hydroxylation of Phenol with H₂O₂ to Dihydroxybenzene

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