ZEOLITIC MATERIALS OF LEV-TYPE STRUCTURE AND METHODS FOR THEIR PRODUCTION

摘要

Zeolitic materials of the LEV-type structure and methods for their production are provided. The method for the production of the zeolitic material having an LEV-type structure comprising Y02 and optionally comprising X2O3 comprises the steps of: (1) preparing a mixture comprising one or more sources for Y02,one or more solvents, and optionally comprising seed crystals; and (2) crystallizing the mixture obtained in step (1), wherein Y is a tetravalent element, and X is a trivalent element, the zeolitic material optionally comprises one or more alkali metals M, the molar ratio of the total amount of the one or more solvents to the total amount of the one or more sources for Y02 based on Y02 is 9.5 or less, and the crystallization temperatures is 175°C or higher in step (2), the duration of crystallization at those temperatures is less than 14 days. The zeolitic materials, preferably being obtainable or obtained according to the inventive method have an LEV-type framework structure comprising Y02 and X203, one or more alkali metals M and display an Y:X atomic ratio of from 1 to 9.4.