Abstract
The kinetics of coke formation and its removal from nickel, copper and alloys have been studied and the results correlated with the morphology of the deposits. Coke deposition from hydrogen-propylene-steam was fast on nickel and slower on copper and the alloys. The deposition on nickel was filamentary in appearance, resulting from a heterogeneously catalysed process, whereas the deposit on the alloys and on non-catalytic copper was essentially uniform. On the alloys, protection appeared to result from the production of scales, containing predominantly Cr3C2 and Cr2O3, on the surface. At the same time, carburization of the alloy was reduced, apparently as a result of the formation of a silicon-enriched layer at the base of the scale. Steam was found to have little effect on coke formation. However, in the absence of gas-phase hydrocarbons, coke gasification by steam was rapid for nickel but several orders of magnitude slower for the alloys. The main effect of steam is to aid in the formation of scales that are protective against coking and carburization, by promoting oxide formation.
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Jackson, P.R.S., Young, D.J. & Trimm, D.L. Coke deposition on and removal from metals and heat-resistant alloys under steam-cracking conditions. J Mater Sci 21, 4376–4384 (1986). https://doi.org/10.1007/BF01106559
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DOI: https://doi.org/10.1007/BF01106559