A Surface Kinetic Model for Coke Deposition Over Stainless Steel,Chromium, and Iron During Ethane Pyrolysis

An experimental reaction setup consisting of an electric furnace and a quartz reactor with metal coupons inside it was used to study the rate of coke formation on the metal surfaces in different ranges of temperature and diluent ratio. Nitrogen, instead of steam, was used as a diluent in order to exclude the potential effect of oxidation of coke in a steam cracking environment. A kinetic model for coke deposition is experimentally derived based on an expounded surface reaction mechanism for ethane pyrolysis over chromium, iron, and stainless steel coupons. The results of the model are in good agreements with the experimental data with a significant probability confidence.