Abstract
The deposition of coke from a propylene-hydrogen mixture on to a range of austenitic Fe-Cr-Ni base alloys has been studied. Morphological investigations reveal the formation of a chromium-rich carbide layer on the surface of the alloys. This layer is initially protective, but eventually develops defects from which coke filaments grow. The formation of these filaments is catalysed by the chromium-depleted metal which becomes accessible to the gas following failure of the carbide layer. Once catalytic coke formation commences, it is maintained by the presence within the coke of small metal particles rich in iron and nickel.
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Tomaszewicz, P., Jackson, P.R.S., Trimm, D.L. et al. Morphological studies of coking on heat-resistant alloys. J Mater Sci 20, 4035–4044 (1985). https://doi.org/10.1007/BF00552396
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DOI: https://doi.org/10.1007/BF00552396