Zeolite synthesis

Chemistry of inorganic compounds – Silicon or compound thereof – Oxygen containing

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Details

252431N, 252455Z, 26032661, 260448C, 423330, C01B 3328

Patent

active

042960835

ABSTRACT:
An improved method for synthesizing improved crystalline zeolites characterized by an alumina to silica mole ratio of not greater than 0.083 and a constraint index within the approximate range of 1 to 12 is provided. The improved method comprises forming a reaction mixture containing one or more sources of alkali metal oxide, organic nitrogen-containing cations, hydrogen ions, an oxide of silicon, water, and optionally, an oxide of aluminum, wherein the mole ratio for hydroxide ions/silica in said reaction mixture is zero and the mole ratio of H.sup.+ (additional)/silica in said reaction is between 0 and 1.0, and wherein the pH of said reaction mixture is at least about 7, and maintaining the reaction mixture at a temperature and pressure for a time necessary to crystallize therefrom said crystalline zeolite. Improvement in the present synthesis method resides, for example, in reduced crystallization time and reduced organic nitrogen-containing cation source requirement. Improvement in zeolite product from the present improved method resides, for example, in enhanced purity.

REFERENCES:
patent: 3702886 (1972-11-01), Argauer et al.
patent: 3709979 (1973-01-01), Chu
patent: 3832449 (1974-08-01), Rosiwski et al.
patent: 3849463 (1974-11-01), Dwyer et al.
patent: 3992466 (1976-11-01), Plank et al.
patent: 4025571 (1977-05-01), Lago
patent: 4076842 (1978-02-01), Plank et al.

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