Journal article
Water-gas shift over magnetite particles supported on graphite: Effects of treatments in CO/CO2 and H2/H2O gas mixtures
Journal of catalysis, Vol.91(1), pp.167-180
01/1985
DOI: 10.1016/0021-9517(85)90298-2
Abstract
The water-gas shift reaction (at 660 K) was studied over both unsupported magnetite and magnetite particles supported on graphitic materials. It was found that the turnover frequencies over the supported catalysts decreased by an order of magnitude during the first few hours of reaction. About half of the initial high activity could be restored by treatments of the catalyst in CO/ CO2 gas mixtures at 660 K. Treatment in H2/H2O gas mixtures did not lead to significant increases in catalytic activity. This deactivation behavior was not exhibited by unsupported samples. Mössbauer spectroscopy studies indicated that no bulk phase changes occurred during these treatments. Transmission and scanning electron microscopy showed that the magnetite particles were present as large, porous clusters. It is argued that reduction of catalytic activity for graphite-supported magnetite is caused by constriction of the pores within these clusters under water-containing atmospheres due to changes in the surface phase of the magnetite particles.
Details
- Title: Subtitle
- Water-gas shift over magnetite particles supported on graphite: Effects of treatments in CO/CO2 and H2/H2O gas mixtures
- Creators
- D RETHWISCH
- Resource Type
- Journal article
- Publication Details
- Journal of catalysis, Vol.91(1), pp.167-180
- DOI
- 10.1016/0021-9517(85)90298-2
- ISSN
- 0021-9517
- eISSN
- 1090-2694
- Language
- English
- Date published
- 01/1985
- Academic Unit
- Chemical and Biochemical Engineering
- Record Identifier
- 9984003472302771
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