Controlled dealumination of zeolites

Details Controlled dealumination of zeolites Controlled dealumination of zeolites

1983-05-23

1985-08-06

Meros, Edward J.

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

502 60, 502 69, 502 77, C01B 3326, B01J 2906

Patent

active

045335338

ABSTRACT:
Selective and controlled dealumination of an aluminosilicate zeolite is achieved by filling the pore system of the zeolite with a foreign material, for example coke, removing part of the foreign material from the outer portion of the zeolite, for example by heating in a gas stream comprising oxygen, dealuminating the outer portion, and then removing the remainder of the foreign material. Use of such a partially dealuminated zeolite as catalyst in a toluene disproportionation reaction leads to greater selectivity to paraxylene.

REFERENCES:
patent: 3506400 (1970-04-01), Eberly et al.
patent: 3640681 (1972-02-01), Pickert
patent: 3691099 (1972-09-01), Young
patent: 4203869 (1980-05-01), Rollmann
patent: 4273753 (1981-01-01), Chang
patent: 4415544 (1983-11-01), Kokotailo et al.
Fejes et al., "React. Kinet. Catal." vol. 14, No. 4, 1980, pp. 481-488.
"Catalysis by Zeolites" Imelik et al. (Editors), 1980, pp. 203-210.

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