Process for making an acid-base leached zeolite catalyst

Details Process for making an acid-base leached zeolite catalyst Process for making an acid-base leached zeolite catalyst

1998-06-25

1999-09-14

Dunn, Thomas

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

Zeolite or clay, including gallium analogs

Activating treatment

502 66, 502 86, 502 77, B01J 2940

Patent

active

059522593

ABSTRACT:
A catalyst composition and a process for converting a hydrocarbon stream such as, for example, gasoline to olefins and C.sub.6 to C.sub.8 aromatic hydrocarbons such as toluene and xylenes are disclosed. The catalyst composition comprises an alumina and a silica wherein the weight ratio of aluminum to silicon is in the range of from about 0.002:1 to about 0.25:1. The process comprises contacting a hydrocarbon stream with the catalyst composition under a condition sufficient to effect the conversion of a hydrocarbon to an olefin and a C.sub.6 to C.sub.8 aromatic hydrocarbon. Also disclosed is a process for producing the catalyst composition which comprises: (1) contacting a zeolite with an effective amount of a base under a condition sufficient to effect a reduction in silicon content of said zeolite to produce a base-leached zeolite; and (2) contacting said base-leached zeolite with an effective amount of an acid under a condition sufficient to effect a reduction in aluminum content of said base-leached zeolite.

REFERENCES:
patent: 3702886 (1972-11-01), Argauer et al.
patent: 4485185 (1984-11-01), Onodera et al.

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