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Unusual structure and stability of iron-oxygen nano- clusters in Fe-ZSM-5 catalysts

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Abstract

Feng and Hall have recently reported that over-exchanged Fe-ZSM-5 materials prepared by a special route show high stability in the selective reduction of 2-methylpropane (isobutane) by NOx. We report that iron-oxygen clusters in ZSM-5 catalysts prepared by a conventional route show unexpected structural features, with significant iron-iron co-ordination and a rather short Fe- Fe interatomic distance of 2.53±0.02 Å. Iron in these clusters is readily interconvertible between the (II) and (III) oxidation states, but the clusters are stable against reduction to Fe(0) even at 1250 K in hydrogen. We suggest that the clusters adopt structures similar to that of ferredoxin II, Fe3S4.

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Authors
  1. R.W. Joyner
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  2. M. Stockenhuber
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Joyner, R., Stockenhuber, M. Unusual structure and stability of iron-oxygen nano- clusters in Fe-ZSM-5 catalysts. Catalysis Letters 45, 15–19 (1997). https://doi.org/10.1023/A:1019063511784

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  • DOI: https://doi.org/10.1023/A:1019063511784

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