Process for the preparation of an improved chabazite for the pur

Details Process for the preparation of an improved chabazite for the pur Process for the preparation of an improved chabazite for the pur

1989-04-06

1991-06-25

Sneed, H. M. S.

Chemistry of inorganic compounds

Silicon or compound thereof

Oxygen containing

55 75, 502407, C01B 3334

Patent

active

050265326

ABSTRACT:
A process is provided for preparing a synthetic chabazite having a Si/Al ratio of 1.8 to 2.3 by mixing an alumina source, sodium hydroxide, potassium hydroxide, a TMA reagent at a ratio of (TMA).sub.2 O:Al.sub.2 O.sub.3 of 0.08 to 0.0001, and a silica source to form a gel, crystallizing the gel by heating at a temperature of from about 25.degree. to 150.degree. C. for at least one hour, and separating the resulting chabazite product.

REFERENCES:
"Zeolite Molecular Sieves", D. W. Breck, John Wiley & Sons, New York, 1974.
"Role of Potassium in the Thermal Stability of CHA-and EAB-Type Zeolites," S. Cartlidge et al., Zeolites, vol. 4, p. 226, 1984.
"The Hydrothermal Chemistry of the Silicates, Part VII. Synthetic Potassium Aluminosilicates," R. M. Barrer et al., J. Chem. Soc., pp. 2882-2891 (1956).
"Chabazite Phase Crystallization in the Presence of Tetramethyl-Ammonium Ions," G. V. Tsitsishvili et al., Soobshcheniya Akademii nauk Bruzinskoi SSR, 97, No. 3, 1980, pp. 621-624.
"Solid State Transformations of Synthetic CHA-and EAB-Type Zeolites in the Sodium Form", S. Cartlidge et al., Zeolites, vol. 4, p. 218, (1984).
"The Role of Organic Molecules in Molecular Sieve Synthesis," Lok et al., Zeolites, vol. 3, p. 282, (1983).
"Synthesis and Crystal Growth of Zeolite ZSM-5 from Sodium Aluminosilicate Systems Free of Organic Templates", E. Narita, Ind. Eng. Chem. Prod. Res. Olev., 1985, 24, 507-512.

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