磁化合成铁氧体催化机理的探讨

On the Catalysis Micro-Mechanism of Ferrite With a Magnetic Field

本文用磁化合成法制取了一种新型高效铁氧体催化剂,用高分辨分析电镜,测定了其晶体结构、化学组成和原子级的显微形貌;提出了一种催化机制的新见解和一个研制催化剂的新方法.

The ferrite synthesized in a magnetic field can increase the reaction rate of hydrogen peroxide decomposition. This paper presents the following new concept of the catalysis micro-mechanism by observation with HRAEM and EELS: a. The ferrite catalyst has a crystalline structure of spinel type Fex0 or Fe3O4- at 0.75≤x≤0.9 or 0.2≤0.5; b. There exists a redox reaction Fe2++2e()a-Fe on the catalyst surface; c. The magnetic field can impel more Fe2+ to occupy the octahedral site, so the Fe/O atom ratio, the residual magneton and the crystal defects are increased, which leads to an increase of the catalytic reaction rate in redox reaction. A magnetic criterion for catalytic reaction and a new method for increasing the catalytic reaction rate are proposed.