Zeolitic catalyst composition of improved shape selectivity

Details Zeolitic catalyst composition of improved shape selectivity Zeolitic catalyst composition of improved shape selectivity

1989-08-18

1991-07-23

Dees, Carl F.

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

Zeolite or clay, including gallium analogs

502 66, 502 71, B01J 2906, B01J 2930

Patent

active

050343629

ABSTRACT:
There are provided aromatic conversion reactions for preparation of dialkylbenzenes, such as xylene and ethyltoluene, of enhanced para isomer content with a zeolitic catalyst composition of improved shape selectivity. The catalysts comprise certain zeolites which have been calcined at a high temperature of at least 649.degree. C. (i.e., 1200.degree. F.). These zeolites have a silica/alumina ratio of at least about 12 and a constraint index within the approximate range of 1 to 12. Examples of such zeolites include ZSM-5 and ZSM-11.

REFERENCES:
patent: 3790471 (1974-02-01), Argauer et al.
patent: 4049573 (1977-09-01), Kaeding

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