Layered cracking catalyst and method of manufacture and use ther

Details Layered cracking catalyst and method of manufacture and use ther Layered cracking catalyst and method of manufacture and use ther

1991-07-24

1993-01-12

Dees, Carl F.

Catalyst, solid sorbent, or support therefor: product or process

Zeolite or clay, including gallium analogs

And additional al or si containing component

502 65, 502 68, B01J 2904

Patent

active

051790548

ABSTRACT:
A layered catalyst suited to the catalytic cracking of heavy feeds comprises a core and a shell. The shell comprises at least 5 wt % of at least 1 molecular sieve having openings of at least 8 angstroms. The core comprises at least 10 wt % of at least 1 molecular sieve having openings comprising a 12 or less-membered ring and has a reduced, if any, content of said molecular sieve having openings of at least 8 angstroms, relative to its concentration in the shell. Suitable molecular sieve materials having openings of at least 8 angstroms include MCM-41, VPI-5, MCM-9 and layered metal oxides, e.g., pillared clays. The required molecular sieve of the core can include zeolite Y, Ultrastable Y or intermediate pore size zeolites such as ZSM-5. The shell which may further contain a metals passivator can act as a metals sink, and can remove metals from the unit by attrition. The catalyst is preferably prepared by forming the core and then coating or encapsulating the core with a shell material. The shell may also comprise an attritable coating of an amorphous rare earth oxide, aluminum oxide and aluminum phosphate composite, which traps metals.

REFERENCES:
patent: 4612298 (1986-09-01), Hettinger, Jr. et al.
patent: 5006497 (1991-04-01), Herbst et al.
patent: 5057296 (1991-10-01), Beck
patent: 5077253 (1991-12-01), Chu et al.
"Ultralarge Pore Molecular Sieves", P. A. Jacobs & R. A. Santen, 1989, pp. 439-446.

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