ZnFe_2O_4中阳离子分布对苯酚H_2O_2羟化制苯二酚催化活性的影响  

Influence of Cation Distribution of ZnFe_2O_4 on Its Catalytic Activityof Phenol Hydroxylation with H_2O_2

作　　者：刘庆生[1] 于剑锋[1] 杨飘萍 王振旅[1] 杨胥微[1] 吴通好[1] 

机构地区：[1]吉林大学化学学院,长春130023

出　　处：《高等学校化学学报》2004年第4期701-704,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金 (批准号 :2 9773 0 16)资助

摘　　要：具有尖晶石结构的铁酸盐是苯酚 H2 O2 羟化合成苯二酚的有效催化剂 .分别用共沉淀和水热法制备了Zn Fe2 O4,并用 Mossbauer,XRD和 ESR等方法予以表征 .发现不同方法制备的 Zn Fe2 O4中阳离子在四面体和八面体位置的分布不同 ,认为阳离子分布影响了催化活性 .The spinel ferrite exhibits a good catalytic performance in phenol hydroxylation by H 2O 2 to dihydroxybenzene. ZnFe 2O 4 was synthesized by co-precipitation and hydrothermal methods. The catalysts were characterized by means of Mssbauer spectroscopy, XRD and ESR techniques.The results of Mssbauer spectra, XRD and ESR all indicate that ZnFe 2O 4 synthesized from hydrothermal processing is the normal spinel structure, while ZnFe 2O 4 synthesized from co-precipitation method is partly inverse spinel with a substantial displacement of Fe 3+ cations to A sites and Zn 2+ 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.

关 键 词：尖晶石铁酸锌 阳离子分布 苯二酚 催化剂 苯酚 过氧化氢 羟化反应 

分 类 号：O625.312[理学—有机化学] O643.36[理学—化学]