Synthesis of zeolite ZSM-5

Details Synthesis of zeolite ZSM-5 Synthesis of zeolite ZSM-5

1977-04-22

1979-02-13

Meros, Edward J.

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

252455Z, 260448C, 423328, C01B 3328, B01J 2928

Patent

active

041396006

ABSTRACT:
As synthesized by conventional technique, zeolite ZSM-5 is crystallized in the presence of substantial amount of tetraalkylammonium cations, the alkyl groups of which contain 2 to 5 carbon atoms, such as, for example, tetrapropylammonium. When synthesized in the conventional way, ZSM-5 contains tetraalkylammonium cations as well as substantial amount of sodium ions. To obtain a more catalytically active form of ZSM-5, the sodium ions must be exchanged to very low levels. By synthesizing zeolite ZSM-5 according to the present method, i.e. in the presence of one or more diamines and with a specifically defined reaction mixture composition, ZSM-5 having different organic nitrogen-containing cations but the same crystal structure as conventionally prepared ZSM-5 is obtained. The ZSM-5 prepared in accordance hereto is very low in sodium content as synthesized.

REFERENCES:
patent: 3247195 (1966-04-01), Kerr
patent: 3702886 (1972-11-01), Argauer et al.
patent: 4016245 (1977-05-01), Plank et al.
Breck, "Zeolite molecular sieves," 1974, pp. 304-312.

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