Method of increasing the thermal stability of crystalline zeolit

Details Method of increasing the thermal stability of crystalline zeolit Method of increasing the thermal stability of crystalline zeolit

1973-11-12

1976-01-20

Meros, Edward J.

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

252442, 252445Z, C01B 3328

Patent

active

039339831

ABSTRACT:
Methods of increasing the thermal stability of crystalline zeolites are disclosed. The methods are characterized by the steps of either (i), treating the crystalline zeolite first in at least one step with a dilute solution of a fluorine compound whereby a very small amount of fluoride is incorporated in the zeolite with a subsequent exchange with an ammonium ion, rare earth ion, or other metal ion solution, (ii), first exchanging the zeolite with an ammonium ion, rare earth ion or other metal ion solution followed by a treating with a dilute fluoride solution, or (iii), concurrently treating the zeolite with the fluoride ion and exchanging the zeolite in a simultaneous operation.

REFERENCES:
patent: 3402996 (1968-09-01), Maher et al.
patent: 3575887 (1971-04-01), Wilson
patent: 3594331 (1971-07-01), Elliott
patent: 3619412 (1971-11-01), Clement
patent: 3630965 (1971-12-01), Voorhies et al.

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