Method for increasing the selectivity of a catalytic cracking catalyst

摘要

A method for increasing the selectivity of a catalytic cracking catalyst comprises feeding a fresh catalyst into a fluidized bed with a superficial linear velocity of 0.1-0.6 m/s, contacting with steam, aging at a temperature of between 400-850°C for between 1-720 hours. The steam may include an additional aging medium win the ratio of 0.2:0.9 by weight. The method may include a hot regenerated catalyst in a regenerator into the fluidized and heat exchanging the fresh catalyst and hot regenerated catalyst in the fluidized bed. The catalyst comprises 1-50wt% of a zeolite, 5-00wt% of an inorganic oxide and 0-70wt% of an optional clay. The zeolite is selected from medium and large pore zeolites.