Abstract
The kinetics of coke formation in the cracking of some aromatic hydrocarbons over a silica alumina catalyst and the effects of process time, or reaction period, and reaction temperature on the H/C ratio of coke were studied at various temperatures ranging from 470 to 500°C.
For the kinetics of coke formation, a simple semiempirical equation involving the relationship between coke yield and reaction period was proposed by Voorhies.
Although the rate of coke formation differed from one feedstock to another, the H/C ratio of coke did not, but rather it decreased with increasing reaction temperature and reaction period. Furthermore, the ratio of benzene extract to total coke content decreased with reaction period.
These results suggested that coke was formed by dehydrogenation of the substance deposited on the catalyst surface.
