Low acidity Y zeolite

Details Low acidity Y zeolite Low acidity Y zeolite

1991-03-31

1993-03-02

Dees, Carl F.

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

Zeolite or clay, including gallium analogs

Faujasite type

502 86, B01J 2908

Patent

active

051909030

ABSTRACT:
The invention comprises a hydrogen form Y-zeolite having a unit cell size between about 24.20 Angstroms and 24.40 Angstroms, preferably 24.30 to 24.36 Angstroms, characterized by a low ammonia temperature programmed desorption (TPD) acidity strength value and a relatively high ion exchange capacity. This zeolite may be produced by dehydroxylation as by a dry calcination of a steam modified low sodium zeolite such as LZ-20 zeolite.

REFERENCES:
patent: 3929672 (1975-12-01), Ward
patent: 4263129 (1981-04-01), Chen et al.
patent: 4401556 (1983-08-01), Bezman et al.
patent: 4419271 (1983-12-01), Ward
patent: 4517073 (1985-05-01), Ward et al.
patent: 4664776 (1987-05-01), Ward
patent: 4790928 (1988-12-01), Chang et al.
patent: 4869803 (1989-09-01), Ward
Rabo, American Chemical Society Monograph 171, pp. 140-147.

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