The present invention relates to a cracking catalyst comprising layered clays
and a process for cracking hydrocarbon oils using said catalyst. Said catalyst
is prepared by the process comprising the following steps: mixing and slurrying
an expandable clay, a modifier component, pseudo-boehmite and water for 0.1-10
h to obtain a slurry, aging the slurry at 50-85 C. for 0.1-10 h, then drying
and forming the slurry to obtain a formed material, water washing and aging the
solid, and finally drying and calcining the solid, and said modifier being one
or more selected from the group consisting of hydroxyl polymers of silicon, aluminum,
zirconium or titanium, and substances comprising one or more of said hydroxyl polymers.
Said process for cracking hydrocarbon oils comprises contacting a hydrocarbon oil
with a catalyst under the cracking conditions, said catalyst being the aforesaid
cracking catalyst comprising layered clays or a mixture of at least 1% by weight
of said cracking catalyst comprising layered clays and a prior cracking catalyst.
The catalyst according to the present invention has an improved ability to convert
heavy oils. The process according to the present invention for cracking hydrocarbon
oils has higher conversion of hydrocarbon oils and higher yield of light oils.
