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- W1996264906 abstract "A combination of electron microscopy and hydrogen chemisorption techniques has been used to probe the causes for the unusual loss in catalytic activity of nickel particles in the graphite-hydrogen reaction. This deactivation, which occurs at about 1000 °C, is associated with the spreading of material along the sides of channels created catalytically at lower temperatures. Detailed quantitative analysis of this phenomenon indicates that nickel is progressively laid down as a near-monolayer film on the walls of the channels while the particles move forward. Nickel deposited in this manner strongly interacts with hydrogen “sorbed” by the graphite and therefore has a poor activity for CC bond rupture (carbon gasification) and a low hydrogen chemisorption capacity. Removal of “sorbed” hydrogen at 1000 °C, under vacuum or in inert gas environments, not only results in carbon gasification, but also in removal of NiH interactions and formation of NiC bonds (a surface carbide which does not adsorb H2). These NiC bonds are broken by steaming at 1000 °C and the hydrogen chemisorption capacity is restored." @default.
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- W1996264906 date "1982-06-01" @default.
- W1996264906 modified "2023-09-26" @default.
- W1996264906 title "Further studies of the nickel/graphite-hydrogen reaction" @default.
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- W1996264906 doi "https://doi.org/10.1016/0021-9517(82)90219-6" @default.
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