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- W2071567332 abstract "The reduction behavior of Fe/Al2O3 and Fe/SiO2 catalysts is investigated using in situ Mössbauer spectroscopy and infrared spectra of adsorbed CO. Controlled injection at constant pH (= 6) of an acidified iron(III)nitrate solution into a suspension of the support leads to the formation of highly dispersed supported α-FeOOH particles (2–8 nm). Reduction of the Fe/Al2O3 catalyst is found to proceed via a stabilized Fe1−xO phase according to the sequence α-FeOOH/Fe3O4/Fe1−xO/α-Fe. Reduction for 15 h at 873 K leads to iron crystallites 20–30 nm in diameter. It is shown that these surfaces still contain traces of oxygen. This is in accordance with single crystal investigations which indicate that the reduction of iron surfaces is a surface-sensitive process: full reduction of small particles (consisting of more open surfaces) is virtually impossible. Moreover, it is established that upon high-temperature evacuation following hydrogen reduction the iron surfaces are severely oxidized by water molecules formed by hydrocondensation of hydroxyl groups from the support. Reduction of the Fe/SiO2 catalyst proceeds via an iron(II)silicate phase, which at higher temperatures is partly reduced to α-Fe. Small iron particles (10 nm) densely and homogeneously distributed over the support are obtained by prolonged reduction (up to 150 h) at 723 K, whereas severe sintering occurs upon reduction for relatively short periods (16 h) at temperatures above 823 K. With the silica-supported iron catalyst the iron crystallites appear to be (partly) encapsulated by an iron(II)silicate layer. The encapsulation of the silica-supported iron particles, the incomplete reduction of the alumina-supported iron particles, and the reoxidation occurring upon high-temperature evacuation presumably account for the small extent of room temperature hydrogen chemisorption usually found with supported iron catalysts." @default.
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- W2071567332 date "1989-05-01" @default.
- W2071567332 modified "2023-10-16" @default.
- W2071567332 title "The reduction behavior of silica-supported and alumina-supported iron catalysts: A M�ssbauer and infrared spectroscopic study" @default.
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- W2071567332 doi "https://doi.org/10.1016/0021-9517(89)90216-9" @default.
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