Isotropic tracer techniques have been used to characterize the dynamics of carbon deposition on the surface of a Ru/TiO/sub 2/ catalyst during Fischer-Tropsch synthesis and /sup 13/C-NMR spectroscopy has been used to characterize the structure of the deposited carbon. Elemental carbon, designated C/sub ..cap alpha../ is formed very rapidly, whereas alkyl carbon, designated C/sub ..beta../ accumulates much more slowly. The influence of catalyst reduction on temperature, reaction conditions, and time under reaction conditions on the surface concentrations and reactivity of C/sub ..cap alpha../ and C/sub ..beta../ will be discussed. It will be shown that C/sub ..beta../ progressively becomes less reactive and may be the precursor to the formation of graphitic carbon.
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