Study on the reduction behavior of zirconia supported iron oxide catalysts by temperature-programmed reduction combined with in situ Mossbauer spectroscopy

被引：17

作者：

Chen, KD ^{[1
]}

Fan, YN ^{[1
]}

Hu, Z ^{[1
]}

Yan, QJ ^{[1
]}

机构：

[1] NANJING UNIV,DEPT CHEM,NANJING 210093,PEOPLES R CHINA

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 1996年 / 121卷 / 01期

基金：

中国国家自然科学基金;

关键词：

D O I：

10.1006/jssc.1996.0034

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The reduction properties of Fe2O3/ZrO2 catalysts with various Fe2O3 loading and the interactions between iron oxide and zirconia have been studied by using temperature-programmed reduction combined with in situ Mossbauer spectroscopy, This is shown that the intermediates formed during reduction depend strongly not only on the reduction temperature but also on the iron loading, Several iron species such as bulk phase alpha-Fe2O3, small alpha-Fe2O3 particles, and surface iron oxide species are found in the zirconia supported iron oxide catalysts, Reduction of the small alpha-Fe2O3 particles is easier than that of the bulk phase alpha-Fe2O3. In contrast, the surface iron oxide species are much more difficult to reduce because of their strong interactions with the support, The phenomena of partial oxidation of Fe2+ cations and Fe3O4 to Fe3+ cations in the reduction processes are observed. (C) 1996 Academic Press, Inc.

引用

页码：240 / 246

页数：7

共 22 条

[1] AMMONIA-SYNTHESIS OVER SUPPORTED IRON CATALYST PREPARED FROM AMORPHOUS IRON ZIRCONIUM PRECURSOR .1. BULK STRUCTURAL AND SURFACE CHEMICAL-CHANGES OF PRECURSOR DURING ITS TRANSITION TO THE ACTIVE CATALYST [J].