High silica crystalline zeolites and process for their preparati

Details High silica crystalline zeolites and process for their preparati High silica crystalline zeolites and process for their preparati

1989-07-05

1991-05-28

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 62, 502 79, B01J 2906, B01J 2908

Patent

active

050195433

ABSTRACT:
Crystalline aluminosilicate zeolites having increased silica to alumina mole ratios are prepared by a process wherein a conventional crystalline aluminosilicate zeolite is treated to remove alumina from the crystal lattice. By-product non-framework amorphous alumina is then selectively removed from the zeolite either by using a blocking agent, to prevent removal of framework aluminum during a subsequent acid treatment, or by using a selective organic acid extracting agent. The invention is also directed to high silica crystalline zeolites prepared by the present process.

REFERENCES:
patent: 4093560 (1978-06-01), Kerr et al.
patent: 4512961 (1985-04-01), Scherzer et al.
patent: 4533533 (1985-08-01), Dewing et al.
patent: 4840930 (1989-06-01), LaPierre et al.

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