Ferrisilicate molecular sieve

Details Ferrisilicate molecular sieve Ferrisilicate molecular sieve

1990-07-13

1991-12-31

Breneman, R. Bruce

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

502 77, 502 66, 502 85, 518719, 518720, C01B 3334

Patent

active

050770268

ABSTRACT:
Ferrisilicate molecular sieves of the ZSM-5 type, having SiO.sub.2 /Fe.sub.2 O.sub.3 mole ratios ranging from 20 to 400, are prepared by adding a silica source and a quaternary ammonium salt in that order to an acedified solution of an iron (III) compound, crystallizing the resulting gel to form a ferrisilicate molecular sieve, and thermally treating the molecular sieve with nitrogen, air and/or steam at 300.degree. to 700.degree. C. Preferred thermal treatment comprises treating with nitrogen first, then with air or steam. Thermally treated molecular sieves contain iron both in and outside the crystal framework; most of the non-framework iron is dispersed as very finely divided iron oxides or internal surfaces. Molecular sieves are useful as catalysts in Fischer-Tropsch and other iron oxide-catalyzed reactions.

REFERENCES:
patent: 4952385 (1990-08-01), Nair et al.

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