The effect of competitive adsorption on catalytic cracking reaction of Dagang coking gas oil over commercial equilibrium catalysts LBO-16 was investigated in a confined fluidized bed reactor

and the competitive adsorption behavior of the characteristic ingredients was analyzed .The experimental results showed that competitive adsorption had strong effect on catalytic cracking conversion

but with the increase of mass ratio of catalyst to oil

the effect of competitive adsorption on catalytic cracking can be eliminated.Nitrogen compounds and polycyclic aromatic hydrocarbons in the feedstock had strong competitive adsorption effect that interfered catalytic cracking reaction of hydrocarbons and was an important cause of fast coke formation.With weakening of competitive adsorption behavior

the rate of dehydro-condensation reaction decreased

and hydrogen transfer reaction was obviously strengthened.