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- W2051225787 abstract "Mössbauer spectra of FeRhSiO2 catalysts (5 wt% metal, solFeRh atomic ratio = 1) have been recorded in situ at liquid-helium, liquid-nitrogen, and room temperatures. After reduction in H2 at 725 K, 80% of the iron in the catalyst is still in an Fe3+ surface phase, while 20% of the iron is Fe0 alloyed with at least 1.5 times as much Rh. Fischer-Tropsch synthesis in CO + 3.3 H2 at 525 K converts a part of the surface Fe3+ into an Fe2+ compound. Exposure of this catalyst to air at room temperature results in oxidation of all Fe2+ and nearly all of the Fe0 to an Fe3+ state. The results illustrate the information contained in the temperature dependence of the resonant absorption areas of the Mössbauer spectra and the need for low-temperature spectra in quantitative analysis." @default.
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- W2051225787 date "1984-09-01" @default.
- W2051225787 modified "2023-10-12" @default.
- W2051225787 title "Characterization of surface phases in bimetallic FeRh/SiO2 catalysts by in situ M�ssbauer spectroscopy at cryogenic temperatures" @default.
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- W2051225787 doi "https://doi.org/10.1016/0021-9517(84)90288-4" @default.
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