Thirteen iron powders and one cobalt powder were evaluated for suitability as catalysts for graphitization by hydrogen reduction. The optimal catalyst is characterized by rapid graphitization, homogeneity and lack of sintering of the catalyst/carbon mixture, and contains minimal amounts of both modern and ″dead″ carbon. The results of this study indicate three good ″catalyst-candidates″ with backgrounds on processed coals around 60ka BP and modern and dead carbon contamination of ≤0.2µgC for 4-5mg of catalyst.
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See more of The 10th International Conference on Accelerator Mass Spectrometry (September 5-10, 2005)