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- W2022051850 abstract "Nitrogenation for the intermetallic compounds such as MFe2 (M = Ti, Zr, Nb, and Mo) or M‘Fe (M‘ = Ti and V) and the subsequent hydrogenation for the resulting interstitial metal nitrides were carried out to characterize their nitrogen storage properties by heating in a NH3−H2 mixed gas or N2 gas at 450−500 °C for the former reaction and in H2 gas at 450 °C for the latter one, respectively. Among the intermetallic compounds, the Laves-type MFe2 and the CrFe-type VFe compounds absorbed large amounts of nitrogen into their crystal lattices to transform into amorphous-like a-MFe2Nx and a-VFeNx. They reversibly desorbed nitrogen by the following hydrogenation with maintaining the amorphous-like structure. Qualitative and quantitative analyses of the nitrogen species generated in the desorption step revealed that most of the nitrogen released from the metal nitrides readily reacted with hydrogen to produce ammonia owing to the high reactivity of the atomic nitrogen stored in the intermetallic compounds. Furthermore, the amorphous-like a-TiFe2Nx-δ derived by the nitrogenation in the NH3−H2 mixed gas and the subsequent hydrogenation in H2 gas absorbed nitrogen even in N2 gas at 500 °C as loaded with a Ru/Al2O3 catalyst on the surface. The nitrogen stored was also reversibly desorbed as ammonia, suggesting that the molecular nitrogen was converted to ammonia under ambient pressure via the nitrogen absorption−desorption cycle of (Ru/Al2O3/a-TiFe2Nx)/(Ru/Al2O3/a-TiFe2Nx-δ)." @default.
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- W2022051850 date "1999-10-15" @default.
- W2022051850 modified "2023-10-16" @default.
- W2022051850 title "Nitrogenation and Hydrogenation Characteristics of Transition Metal−Iron Intermetallic Compounds" @default.
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- W2022051850 doi "https://doi.org/10.1021/jp9916182" @default.
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