Abstract
AbstractCoke formation by steam cracking of propane over preoxidised and prereduced alloy foils has been studied in a tubular reactor at 810–850°C. Coke formation on preoxidised steel involves coke formation on the oxide scale which is low and coke formation on metal exposed by spalling of the scale which is high. Surface analysis by Auger spectroscopy (AES) reveals that the surface concentration of iron and nickel is low on the oxide scale and high on the exposed metal. Coke formation on the surface of the prereduced steel is low and the surface contains chromium and manganese as the predominant metal components. Differences in the product spectra obtained over preoxidised and prereduced steels is suggested to be due to the presence of surface iron and nickel which increases the production of coke and hydrogen and decreases the production of olefins in steam cracking.
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