초록 ▼

Mesoporous molecular sieve substances having a structure exhibiting a hexagonal arrangement of straight channels uniform in diameter, superior over MCM-41 substances of Mobil Co. in thermal stability and hydrothermal stability, can be prepared by the methods characterized in using various organic or

Mesoporous molecular sieve substances having a structure exhibiting a hexagonal arrangement of straight channels uniform in diameter, superior over MCM-41 substances of Mobil Co. in thermal stability and hydrothermal stability, can be prepared by the methods characterized in using various organic or inorganic salts.

대표청구항 ▼

[ What is claimed is:] [1.] A method for preparing a mesoporous molecular sieve substance, comprising the steps of:(A) mixing an aqueous ammonia solution, a silicate, and an alkyltrimethylammonium halide as a surfactant, represented by the following formula I: EQU C.sub.n H.sub.2n+1 (CH.sub.3).sub.3

[ What is claimed is:] [1.] A method for preparing a mesoporous molecular sieve substance, comprising the steps of:(A) mixing an aqueous ammonia solution, a silicate, and an alkyltrimethylammonium halide as a surfactant, represented by the following formula I: EQU C.sub.n H.sub.2n+1 (CH.sub.3).sub.3 NX I re n is an integer of 12 to 18 and X is Cl or Br, to prepare a mixed aqueous solution;(B) subjecting the mixed aqueous solution formed in step (A) to hydrothermal reaction, adjusting its pH and re-subjecting it to hydrothermal reaction to prepare a hydrothermally treated aqueous solution;(C) adding to the hydrothermally treated solution of step (B) one or more water-soluble organic or inorganic salts which are capable of binding to a monovalent cation;(D) subjecting the solution resulting from step (C) to hydrothermal reaction, adjusting its pH and re-subjecting to hydrothermal reaction;(E) subjecting the solution resulting from step (D) to hydrothermal reaction for a suitable period at a suitable temperature while maintaining its pH, so as to give precipitates of a molecular sieve substance;(F) filtering, washing and drying the precipitates of the molecular sieve substance; and(G) calcining the dried precipitates.