Abstract
Catalytic channels created by nickel particles during the hydrogenation of graphite cease at around 1250 K as the metal spreads and wets the sides of the channels with a resultant loss in activity. Particles are reformed along the edges of the channels by subsequent reaction in steam at 1125 K. In an attempt to learn more about this extraordinary behavior of nickel, both in the wetted and redispersed states we investigated the ferromagnetic properties of the nickel-graphite system treated under various conditions. Ferromagnetic resonance (FMR) provides both qualitative and quantitative information on particle size and shape, degree of reduction, surface anisotropy, and metal-support constraints for the dispersed ferromagnetic metal. In addition to confirming many of the previous conclusions on this system, the FMR data point to the existence of a strong nickel-graphite interaction which is broken by treatment in steam.
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