Method for preparation MCM-48 medium pore molecular sieve thermostable in high heat and water in buffer system

A technology of mesoporous molecular sieve and MCM-48, applied in the field of MCM-48 mesoporous molecular sieve material, can solve problems such as unsatisfactory results, and achieve the effect of perfect pore wall structure, high degree of crystallization and simplified operation.

Inactive Publication Date: 2005-10-26
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the methods reported above have improved the hydrothermal stability of MCM-48 materials to a certain extent, the results are still not satisfactory.

Method used

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  • Method for preparation MCM-48 medium pore molecular sieve thermostable in high heat and water in buffer system
  • Method for preparation MCM-48 medium pore molecular sieve thermostable in high heat and water in buffer system
  • Method for preparation MCM-48 medium pore molecular sieve thermostable in high heat and water in buffer system

Examples

Experimental program
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Effect test

example 1

[0022] 0.403gNa 2 HPO 4 ·12H 2 O and 0.035g sodium hydroxide dissolved in 45ml water, then add a certain amount of CTAB and OP-10, stir at 30 ℃ until clear, and then add water glass (Na 2 O: 7.4%, SiO 2 : 25.4%), a uniformly mixed starting gel was obtained after stirring for 1 hour. At this time, the molar composition of the synthetic mixture is: 1.0SiO 2 :0.12CTAB:0.04OP-10:0.35Na 2 O: 0.025P 2 O 5 :58H 2 O. Then, it was crystallized at 100°C for 48 hours to obtain MCM-48 mesoporous molecular sieve.

example 2

[0024] 0.282gNa 2 HPO4 ·12H 2 O and 0.041g of sodium hydroxide are dissolved in 49.5ml of water, then add a certain amount of CTAB and OP-10, stir at 38 ℃ until clear, then add water glass (Na 2 O: 7.4%, SiO 2 : 25.4%), a uniformly mixed starting gel was obtained after stirring for 1 hour. At this time, the molar composition of the synthetic mixture is: 1.0SiO 2 : 0.12CTAB: 0.04OP-10: 0.31Na 2 O: 0.018P 2 O 5 :64H 2 O. Then, it was crystallized at 105°C for 52 hours to obtain MCM-48 mesoporous molecular sieve.

example 3

[0026] 0.32gNa 2 HPO 4 ·12H 2 O and 0.039g of sodium hydroxide are dissolved in 41.3ml of water, then add a certain amount of CTAB and OP-10, stir at 25℃ until clear, then add water glass (Na 2 O: 7.4%, SiO 2 : 25.4%), a uniformly mixed starting gel was obtained after stirring for 1 hour. At this time, the molar composition of the synthetic mixture is: 1.0SiO 2 : 0.12CTAB: 0.04OP-10: 0.0.309Na 2 O: 0.02P 2 O 5 : 54.8H 2 O. Then, it was crystallized at 110°C for 40 hours to obtain MCM-48 mesoporous molecular sieve.

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Abstract

The present invention use cetyl trimethyl ammonium bromide (CTAB, cation surface active agent) and polyoxyethylene octyl phenyl ether (OP-10), non-ionic surface active agent) mixed surface active agent as template agent, and uses buffer solution with a certain pH as synthesis medium, and utilizes surface active agent supermolecular self-assembling process to synthesize MCM-48 metaporous molecular sieve with higher thermal (stability and hydrothermal stability.

Description

Technical field [0001] The invention relates to a method for preparing MCM-48 mesoporous molecular sieve material with high thermal and hydrothermal stability by using mixed cation-nonionic surfactant as a template in a buffer system. Background technique [0002] MCM-48 is a member of a new type of inorganic porous material M41S series that appeared in the early 1990s. Its Ia3d structure has higher structural symmetry than the p6m structure of MCM-41 with hexagonal phase and one-dimensional pore system. At the same time, MCM-48 has two independent double continuous spiral three-dimensional channel systems, which has good transmission performance, so it is used in chiral catalysis, macromolecule adsorption and separation, assembly of functional polymer composites, nonlinear optical materials, The preparation of mesoporous metals, mesoporous oxides and mesoporous carbons and the preparation of various nanomaterials have broad application prospects. Therefore, MCM-48 has aroused gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/00
Inventor 孔令东刘苏李全芝
Owner FUDAN UNIV
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