Abstract
The location of the Al 2O 3 in a reduced singly promoted iron catalyst (3% Al 2O 3 with 250 Å iron particles) was determined by Mössbauer spectroscopy. A mildly reduced catalyst exhibits a paramagnetic phase which disappears upon further reduction. The hyperfine parameters of the reduced catalyst agree with those of pure α-Fe. These observations are best reconciled with the idea that the Al 2O 3 is present in the α-iron in the form of ca. 30 Å inclusions consisting of FeAl 2O 3 in the incompletely reduced catalyst and of Al 2O 3 itself after thorough reduction.
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