Synthesis of zeolite ZSM-5

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

1983-08-05

1985-07-02

Meros, Edward J.

Catalyst, solid sorbent, or support therefor: product or process

Zeolite or clay, including gallium analogs

And additional al or si containing component

423329, C01B 3328

Patent

active

045268797

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 a 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 a combination of an amine and a halide in the presence of a mutual solvent 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 herewith is very low in sodium content as synthesized and has a crystal size of from about 0.05 microns to about 20 microns.

REFERENCES:
patent: 4025571 (1977-05-01), Lago
patent: 4025572 (1977-05-01), Lago
patent: 4082805 (1978-04-01), Kaeding
patent: 4139600 (1979-02-01), Bollmann et al.
patent: 4151189 (1979-04-01), Rubin et al.

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