In propane dehydrogenation to propene

the catalyst is continuously deactivated owing to coke formation

which needs to be burnt off periodically to regenerate the catalyst.In this paper

an effectiveness factor modified coke burning-off model was used and a dynamic heterogeneous model for the reactor was established

which took into consideration the pore and film diffusion effects.Simulation study showed that there was a large temperature difference between gas and solid.At the beginning of coke burning-off

because the accumulation of reaction heat

the temperature of solid increased rapidly

which was more obvious near the inlet of the reactor.The temperature quickly decreased to the same temperature with gas when the carbon burning was close to completion.Coke burning-off gradually advanced along the bed

and the hot spot of the bed also gradually advanced from inlet to outlet.The hot spot temperature had little change in different bed position.