Study on the reduction behavior of zirconia supported iron oxide catalysts by temperature-programmed reduction combined with in situ Moessbauer spectroscopy
- Nanjing Univ. (China)
The reduction properties of Fe{sub 2}O{sub 3}/ZrO{sub 2} catalysts with various Fe{sub 2}O{sub 3} loading and the interactions between iron oxide and zirconia have been studied by using temperature-programmed reduction combined with in situ Moessbauer spectroscopy. It 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}Fe{sub 2}O{sub 3}, small {alpha}-Fe{sub 2}O{sub 3} particles, and surface iron oxide species are found in the zirconia supported iron oxide catalysts. Reduction of the small {alpha}-Fe{sub 2}O{sub 3} particles is easier than that of the bulk phase {alpha}-Fe{sub 2}O{sub 3}. 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 Fe{sup 2+} cations and Fe{sub 3}O{sub 4} to Fe{sup 3+} cations in the reduction processes are observed.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 223721
- Journal Information:
- Journal of Solid State Chemistry, Vol. 121, Issue 1; Other Information: PBD: 5 Jan 1996
- Country of Publication:
- United States
- Language:
- English
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