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- W160102178 abstract "The structures and magnetic properties of the nitride phases have been investigated by various authors using several techniques, including XRD, LEED, Auger and Mossbauer spectroscopy. Three nitride phases have been differentiated: ..gamma..-Fe/sub 4/N, epsilon-Fe/sub x/N, and zeta-Fe/sub 2/N. The phase diagram has also been presented elsewhere. As the nitrogen content increases, the structure changes from BCC, to FCC, to HCP, to orthorhombic. Mossbauer spectroscopy is particularly effective in differentiating the various iron nitrides. In previous work, the authors examined the stability, surface chemistry and catalytic behavior of the three iron nitrides, principally on unsupported iron powders. Stability of these structures in various gas phase atmospheres was found to be a vital issue when evaluating the dynamics of the catalysts or reactions on them. At 523 K in pure hydrogen, the nitrides decompose rapidly to Fe/sup 0/ and NH/sub 3/, whereas in synthesis gas slow replacement of nitrogen for carbon in the bulk results in the formation of carbonitride phases. A surface nitrogen species, deposited during the nitriding pretreatment in ammonia, was found to be extremely active, suggesting a possible surface synthesis route to nitrogen containing compounds when NH/sub 3/ is added to synthesis gas. Accordingly, the literature, along with severalmore » patents, reports the production of amines or nitriles with these reactants over iron catalysts. The authors have expanded their studies to include the behavior of iron nitride catalysts and reaction kinetics of CO, H/sub 2/ and NH/sub 3/ reactions.« less" @default.
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- W160102178 date "1986-01-01" @default.
- W160102178 modified "2023-09-24" @default.
- W160102178 title "Selectivity and stability of synthesis reactions over iron nitrides" @default.
- W160102178 hasPublicationYear "1986" @default.
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