Method of the preparation of microporous crystalline molecular sieve possessing mesoporous frameworks

A method of preparing a microporous crystalline molecular sieve materials having mesoporous skeleton, characterized in that a meso-SDA (structural-directing agent) is added into a gel composition for the synthesis of a molecular sieve containing a micro-SDA to form an organic-inorganic composite gel structure, wherein said meso-SDA is selected from the group consisting of an organosilane having the following formula (1), an organophosphonic acid having the following formula (2), and a silica precursor organo-functionalized with said organosilane or organophosphonic acid:

• RSiX3 or R2SiX2 or R3SiX (1)
• RP(═O)X3 or R2P(═O)X2 or R3P(═O)X (2)
• wherein X represents a hydrolysable group selected from the group consisting of hydroxyl, halide and alkoxy, and wherein R represents a C2-30 alkyl or alkenyl group, wherein the alkyl group may have a substituent selected from the group consisting of hydroxyl, halide, thiol, amino, cyano, nitro, amide, carboxylic acid, sulphonic acid, glycidyl, aryl and heteroaryl and may have 1 to 3 heteroatoms selected from the group consisting of N, O, S and Si in alkyl chain.