Abstract: The USY, REHY, REY zeolite containing catalysts were prepared by spray drying. The effects of reaction temperature, agent oil mass ratio and catalyst acid content on the production of C4 hydrocarbons were investigated by catalytic cracking of n-decane in a small fluidized bed. At the reaction conditions of catalyst/oil mass ratio of 6, reaction time 75s, the selectivity of isobutane decreases by 2 %, while the selectivities of n-butane and isobutene increase of 1%, but the selectivity of n-butene increases of 2-3% as the reaction temperature increases from 460℃ to 540 ℃. The selectivity of C4 hydrocarbon products is basically unchanged at reaction temperature of 500℃ in the range of catalyst/oil mass ratio from 3 to 9. Increasing the acid content of catalyst can increase the selectivity of n-butane and isobutane and decrease the selectivity of butene and isobutene.

Key words: n-decane, Y zeolite, catalytic cracking, C4 hydrocarbon