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- W2068590926 abstract "Sintering of nickel on γ-alumina in hydrogen, ammonia, ammonia+hydrogen and ammonia+nitrogen was investigated isocoric in the temperature range 483–523 K. The sintering process was followed by hydrogen chemisorption, specific surface area measurements, X-ray diffraction and transmission electron microscopy. After exposure to ammonia+hydrogen, hydrogen chemisorption revealed a fast decline of the nickel surface area. The results from X-ray diffraction and transmission electron microscopy are consistent with the result from the chemisorption experiments. The BET analysis showed that there are no losses of the total surface area. The sintering rate was significantly slower if the heat treatment was performed in the presence of only one of the gases, ammonia or hydrogen, or in ammonia+nitrogen. This indicates that the sintering in the temperature range 483–523 K only occurs with reduced nickel particles in ammonia+hydrogen. The prevailing mechanism for the sintering seems to be sintering by particle migration. The kinetics of the sintering process indicates that the rate constant is correlated to more factors than the temperature." @default.
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- W2068590926 date "2002-03-01" @default.
- W2068590926 modified "2023-09-28" @default.
- W2068590926 title "Sintering of nickel particles supported on γ-alumina in ammonia" @default.
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- W2068590926 doi "https://doi.org/10.1016/s0926-860x(01)00957-7" @default.
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