Zeolite synthesis using an alcohol or like molecules

Details Zeolite synthesis using an alcohol or like molecules Zeolite synthesis using an alcohol or like molecules

1991-10-30

1992-11-03

Pal, Asok

Chemistry of hydrocarbon compounds

Aromatic compound synthesis

By dealkylation

585467, 585483, 423705, C07C 412

Patent

active

051605007

ABSTRACT:
There is provided a method for preparing a zeolite other than ZSM-5 from a reaction mixture comprising a mixed organic directing agent which is a combination of (a) an organic nitrogen containing compound such as an amine or a quaternary ammonium compound and (b) an alcohol and/or diol. Particular zeolites synthesized by this method include ZSM-22 and ZSM-23. The use of an alcohol or a diol may inhibit the coformation of ZSM-5. Especially when used to prepare ZSM-23, this method enables the preparation of more catalytically active ZSM-23 of reduced crystallite size and also enables the use of lower crystallization temperatures. Particular mixed organic directing agents for the preparation of ZSM-23 are combinations of (a) pyrrolidine and (b) ethanol or ethylene glycol. Other factors which enhance the activity of ZSM-23 include the use of the following in the reaction mixtures for preparing ZSM-23: potassium ions; precipitated silica particles as sources of silica; and spray dried precipitated silica/alumina particles as sources of silica and alumina. The catalytic stability of alumina bound ZSM-23 catalysts is especially enhanced by steaming. Particular reactions which can be catalyzed by ZSM-23 made according to methods described herein include the dealkylation of ethylbenzene and the alkylation of benzene with ethylene.

REFERENCES:
patent: 4100217 (1978-07-01), Young
patent: 4112056 (1978-09-01), Chen et al.
patent: 4560820 (1985-12-01), Field
patent: 4899010 (1990-02-01), Amelse et al.
patent: 4950823 (1990-08-01), Harandi et al.

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