High-silica mordenite and process for preparation thereof

Details High-silica mordenite and process for preparation thereof High-silica mordenite and process for preparation thereof

C - Chemistry, Metallurgy

01

B

252/15

C01B 33/26 (2006.01) B01J 29/18 (2006.01)

Patent

CA 1214151

-17- HIGH-SILICA MORDENITE AND PROCESS FOR PREPARATION TEHEREOF ABSTRACT OF THE DISCLOSURE A high-silica mordenite is provided, which is a synthetic mordenite prepared without performing the dealuminization treatment, and is characterized in that the silica/alumina molar ratio is in the range of from 12 to 30 and the amount of benzene adsorption is 7 to 10% by weight as determined at a temperature of 25°C under a vapor pressure of 35 mmHg. The high-silica mordenite is prepared by a process wherein a reaction mixture having à composition represented by the following oxide molar ratios: Na2/SiO2 = 0.08 - 0.2 SiO2/Al2O = 14 - 55 H2O/Na2O = 100 - 300 and H2O/SiO2 = 10 - 40 is formed using synthetic amorphous silicic acid having an apparent specific gravity of from 0.05 to 0.45 g/ml as a silica source, and the reaction mixture is heated at a temperature of 140 to 180°C with stirring to effect crystallization.

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