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Nano-class molecular sieve and its synthesizing process

A synthesis method and molecular sieve technology are applied in the field of nano-scale MCM-49 molecular sieve and its synthesis, which can solve problems such as differences in the distribution of aluminum atom skeletons, and achieve the effects of shortening crystallization time, high utilization rate of raw materials and high output.

Inactive Publication Date: 2005-03-02
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The framework topology of MCM-49 is the same as that of MCM-22 molecular sieve, but there is a slight difference in the framework distribution of aluminum atoms

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 4.564 grams of sodium aluminate (Al 2 o 3 44.7 wt%, Na 2 O 39.2% by weight) is dissolved in 80 grams of water, adds 20ml organic template agent hexamethyleneimine under stirring condition, then adds silica sol (SiO 2 25% by weight, Na 2 O 0.2% by weight) 120 g. The material ratio (molar ratio) of reactant is:

[0015] SiO 2 / Al 2 o 3 =25

[0016] Oh - / SiO 2 =0.12

[0017] R / SiO 2 =0.35

[0018] h 2 O / SiO 2 =18.9

[0019] After stirring for 30 minutes, put it into a stainless steel reaction kettle. The stirring speed was 45-60 rpm, and the crystallization was carried out at 170°C for 72 hours. After taking out, it is filtered, washed and dried. The obtained crystals were determined to be MCM-49 by X-ray diffractometer. SiO was obtained by chemical analysis 2 / Al 2 o 3 The molar ratio was 24.5. The crystal is characterized by a transmission electron microscope as a flaky hexagonal single crystal with a diameter of 300-500 nm and a thickness of 25...

Embodiment 2

[0021] Dissolve 3.8 grams of sodium aluminate in 80 grams of water, add 20ml of organic template hexamethyleneimine under stirring conditions, then add silica sol (SiO 2 25% by weight) 120 g. The material ratio (molar ratio) of reactant is:

[0022] SiO 2 / Al 2 o 3 =30

[0023] Oh - / SiO 2 =0.11

[0024] R / SiO 2 =0.35

[0025] h 2 O / SiO 2 =18.9

[0026] After stirring for 30 minutes, put it into a stainless steel reaction kettle. The stirring speed was 45-60 rpm, and the crystallization was carried out at 170°C for 72 hours. After taking out, it is filtered, washed and dried. The obtained crystals were determined to be MCM-49 by X-ray diffractometer. SiO was obtained by chemical analysis 2 / Al 2 o 3 The molar ratio was 29. The crystal is characterized by a transmission electron microscope as a flaky hexagonal single crystal with a diameter of 300-500 nm and a thickness of 25-100 nm.

Embodiment 3

[0028] Dissolve 4.564 grams of sodium aluminate in 80 grams of water, add 20 ml of organic template agent hexamethyleneimine under stirring conditions, then add silica sol (SiO 2 25% by weight) 120 g. The material ratio (molar ratio) of reactant is:

[0029] SiO 2 / Al 2 o 3 =25

[0030] Oh - / SiO 2 =0.12

[0031] R / SiO 2 =0.35

[0032] h 2 O / SiO 2 =18.9

[0033] After stirring for 30 minutes, put it into a stainless steel reaction kettle. The stirring speed was 45-60 rpm, and the crystallization was carried out at 180°C for 36 hours. After taking out, it is filtered, washed and dried. The obtained crystals were determined to be MCM-49 by X-ray diffractometer. SiO was obtained by chemical analysis 2 / Al 2 o 3 The molar ratio was 24.5. The crystal is characterized by a transmission electron microscope as a sheet-like hexagonal single crystal with a diameter of 200-450 nm and a thickness of 30-80 nm.

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Abstract

A nano-class molecular sieve MCM-49 with MWW topologic skeleton structure is prepared from SiO2, Al2O3, alkali, template agent (hexamethyleneimine) and water through proportioning, crystallizing for 12-240 hrs, washing in water, and drying. Its advantages are short period, and high output rate and high crystallinity.

Description

technical field [0001] The invention relates to an MCM-49 molecular sieve and a synthesis method thereof, in particular to a nanoscale MCM-49 molecular sieve and a synthesis method thereof. Background technique [0002] In 1993, Mobile Company reported the new catalytic material MCM-49 molecular sieve. The framework topology of MCM-49 is the same as that of MCM-22 molecular sieve, but there is a slight difference in the framework distribution of aluminum atoms. MCM-49 has shown higher activity than MCM-22 in some special catalytic reactions. For example, in the oxygen-free aromatization reaction of propylene, the conversion rate of benzene on MCM-49 is 7.16%, which is much higher than that of MCM-22. 2.64% of 22. Due to its unique structural properties and high thermal stability, MCM-49-supported catalysts show good performance in the fields of conversion of alkanes to olefins and aromatics, catalytic cracking, olefin isomerization, hydrocarbon alkylation, etc. catalytic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/04
Inventor 吴通好阚秋斌许宁王东阳吴鹏
Owner JILIN UNIV
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