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- Title
Study on the effects of Cr2O3 on the reduction behavior of γ-Fe2O3.
- Authors
Chen, L.; Lü, G.
- Abstract
XRD and TG reduction analysis show that γ-Fe2O3 Fe-Cr catalysts, which contains 0.0 to 14.0 wt %. Cr2O3 and prepared by coprecipitating method, consist of crystalline γ-Fe2O3 and non-crystalline Fe2O3. Between 150–450 °C, three reduction stages are observed in the catalyst. The first stage is non-crystalline Fe2O3 reduced to non-crystalline Fe3O4, the second is crystalline γ-Fe2O3 to crystalline Fe3O4 and the third is non-crystalline Fe2O3 reduced to non-crystalline FeO. About 5 wt %. Cr2O3 can enter the lattices of γ-Fe2O3 to form solid solution. With the increasing of Cr2O3 content, the relative abundance of non-crystalline Fe2O3 and the amount of soluble Cr2O3 in non-crystalline increases, while the crystalline size of γ-Fe2O3 decreases.
- Subjects
IRON oxides; CATALYSTS; X-ray diffractometers; RIETVELD refinement; HIGH temperatures; AMMONIA
- Publication
Journal of Materials Science, 1999, Vol 34, Issue 17, p4193
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1023/A:1004682231688