Abstract
Coke formation during the steam cracking of propane has been studied on foils of nickel and of a series of nickel-chromium-iron alloys with a nickel content between 8 and 74wt%. The experiments were carried out at 810 and 850° C in a tubular flow reactor. Coke deposition was measured on prereduced foils using a microbalance. After an initial period the rates of coke deposition on the alloy foils tend to approach a common value independent of the nickel content. On the pure nickel foils a substantially higher rate of coke formation was observed. The results can be explained in terms of the surface composition of the foils as measured by Auger electron spectroscopy.
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