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- W2953012364 abstract "Ruthenium metal in a series of alkali-metal-exchanged faujasite-type zeolites was found to be active for the catalytic synthesis of ammonia from dihydrogen and dinitrogen at temperatures between 300 and 450°C and at atmospheric pressure. A triply promoted iron catalyst exhibited a lower activity under similar conditions. Following reduction in hydrogen, the ruthenium metal crystallites were located within the pore structure of the zeolite microcrystals. Variation of the exchangeable alkali-metal cations and the silicon-to-aluminum ratio altered the activity of the ruthenium catalysts, with RuKX being the most active material. By applying Sanderson′s electronegativity calculations to the ruthenium zeolites, a relationship was found between the turnover frequency for ammonia synthesis and the effective oxygen charge, which was a function of the cation and the Si/Al ratio. Presumably negative charge is transferred from the oxygen to the metal, thereby enhancing the rate of N2 dissociation. The metal particle size also influenced the activity; larger particles were more active. A RuHY zeolite was the least active among the catalysts studied." @default.
- W2953012364 created "2019-06-27" @default.
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- W2953012364 date "2010-09-01" @default.
- W2953012364 modified "2023-09-22" @default.
- W2953012364 title "ChemInform Abstract: Characterization and Ammonia Synthesis Activity of Ruthenium Zeolite Catalysts." @default.
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- W2953012364 doi "https://doi.org/10.1002/chin.199334027" @default.
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