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Method for preparing high degree of order and high stability molecular sieve MCM-41 medium pores

A mesoporous molecular sieve, MCM-41 technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of complex synthesis process, harsh conditions, expensive raw materials, etc., and achieve high degree of order, Good stability and cheap raw materials

Inactive Publication Date: 2005-06-15
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method only improves the hydrothermal stability of MCM-41 molecular sieve to a certain extent, and its disadvantage is that the synthesis process is complicated, the conditions are harsh (high temperature and high pressure), and the raw materials are expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] a. 119ml of sodium silicate solution (modulus 3.37, specific gravity 1.28, concentration 26%) and 30ml high alkali sodium metaaluminate solution (caustic ratio 10.6, concentration 26%) were mixed and stirred at 25°C for 1 hour, Then aged at 30°C for 6 hours, added 1.2ml of glycerol, then added 119ml of sodium silicate solution, stirred and mixed for 1 to 2 hours, and continued to age at 30°C for 9 hours, that is, the product with low viscosity and stable performance transparent microcrystalline liquid.

[0016] b. the 63ml microcrystalline liquid prepared by above-mentioned (a) is mixed with 154ml dodecyltrimethylammonium chloride solution (content is 48%) and 60ml water, adjusts pH with sulfuric acid and is 10-11, stirs 1 hour, Raise the temperature to 99°C for crystallization for 24 hours, filter and dry to obtain a highly ordered and highly stable mesoporous molecular sieve with a silicon-aluminum ratio of 38.

Embodiment 2

[0018] In Example 1, dodecyltrimethylammonium chloride was replaced by hexadecyltrimethylammonium chloride (content: 48%), and other conditions were the same. A mesoporous molecular sieve with a silicon-aluminum ratio of 38 was prepared.

Embodiment 3

[0020] In embodiment 1, glycerol is replaced by ethylene glycol, and other conditions are the same. A mesoporous molecular sieve with a silicon-aluminum ratio of 38 was prepared.

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Abstract

A process for preparing high-ordering high-stability mesoporous molecular sieve MCM-41 by using the ammonium dodecyl (or tetradecyl or hexadecyl or hexadecyl or octadecyl) trimethyl chloride as template and the C1-C5 alcohol as organic disperser includes preparing microcrystalline solution and preparing colloid.

Description

technical field [0001] The invention relates to a method for synthesizing mesoporous molecular sieves with high degree of order and high stability. Background technique [0002] MCM-41 mesoporous molecular sieve has high surface area, high adsorption performance, regular one-dimensional mesopore size, and medium-strong acid strength, which is suitable for cracking macromolecules. It has broad application prospects in the fields of hydrogenation and catalytic cracking, and is a very important catalytic material. [0003] The composition of MCM-41 molecular sieve synthesized by U.S. Patent No. 5,057,296 and U.S. No. 5,108,725 includes divalent, trivalent, tetravalent and pentavalent elements, and there are pure silicon type (silicon-aluminum ratio is infinite) and silicon-aluminum composite type, but the given The example is based on the Si-Al system, except for surfactants such as C 16 h 33 (CH 3 ) 3 In addition to NOH / Cl as a template, an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/04C01B39/04
Inventor 苏建明达建文吴莱萍徐兴忠刘文波刘剑利靳丽君
Owner CHINA PETROLEUM & CHEM CORP
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