Influence of Cation Distribution of ZnFe2O4 on Its Catalytic Activityof Phenol Hydroxylation with H2O2

Abstract

Abstract: The spinel ferrite exhibits a good catalytic performance in phenol hydroxylation by H₂O₂ to dihydroxybenzene. ZnFe₂O₄ was synthesized by co-precipitation and hydrothermal methods. The catalysts were characterized by means of Mossbauer spectroscopy, XRD and ESR techniques.The results of Mssbauer spectra, XRD and ESR all indicate that ZnFe₂O₄ synthesized from hydrothermal processing is the normal spinel structure, while ZnFe₂O₄ synthesized from co-precipitation method is partly inverse spinel with a substantial displacement of Fe³⁺ cations to A sites and Zn²⁺ cations into B sites of the cubic close-packed anionic sublattice. We found that the distribution of cations on tetrahedral and octahedral sites in zinc ferrites was different between the catalysts prepared by hydrothermal and co-precipitation methods, and the catalytic activity was influenced by the distribution of cations.

Key words: Spinel zinc ferrite, Distribution of cations, Catalyst, Phenol hydroxylation

CLC Number:

O643.38

TrendMD:

LIU Qing-Sheng, YU Jian-Feng, YANG Piao-Ping, WANG Zhen-Lü, YANG Xu-Wei, WU Tong-Hao . Influence of Cation Distribution of ZnFe₂O₄ on Its Catalytic Activityof Phenol Hydroxylation with H₂O₂[J]. Chem. J. Chinese Universities, 2004, 25(4): 701.

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Influence of Cation Distribution of ZnFe₂O₄ on Its Catalytic Activityof Phenol Hydroxylation with H₂O₂

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