NU-87 molecular sieve and preparation method thereof

A technology of NU-87 and molecular sieve, which is applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems that affect the catalytic activity of molecular sieves, such as adjustable denaturation of molecular sieves, reduced acidity of molecular sieves, and large dosage of template agents, so as to achieve good catalytic performance and reduce dosage , the effect of reducing the preparation cost

Active Publication Date: 2011-10-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be known from the above method that the molar ratio of silicon to aluminum for synthesizing NU-87 molecular sieve in the prior art is generally more than 20, and a high silicon to aluminum ratio will reduce the acidity of the molecular sieve, which will affect the catalytic activity of the molecular sieve and the adjustability of the molecular sieve.
In addition, the molecular sieve synthesized by the above method also has a small pore volume, generally 0.15-0.24cm 3 / g, large dosage of template agent, high cost, etc.

Method used

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  • NU-87 molecular sieve and preparation method thereof
  • NU-87 molecular sieve and preparation method thereof
  • NU-87 molecular sieve and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Prepare solution 1: add 9.84g sodium hydroxide, 5.23g sodium aluminate (Al 2 o 3 The weight content is 45%), 7.5g decane diammonium bromide, 5.36g sodium chloride and 156ml distilled water, stir evenly, then add 3.6g roasted EU-1 molecular sieve (silicon-aluminum molar ratio is 27). Preparation solution 2: 59.80g silica sol (SiO 2 weight content is 30%) was added into 60ml distilled water, and stirred evenly. Slowly add solution 2 into solution 1, stir evenly, and then put it into a synthesis kettle for dynamic hydrothermal crystallization.

[0025] The crystallization conditions were as follows: the temperature was raised from room temperature to 100° C., and then kept at 100° C. for 1.2 days, and the stirring speed of the synthesis tank was 350 rpm. Then the temperature was raised to 180° C., and the temperature was kept at 180° C. for 5 days, and the stirring speed of the synthesis tank was 250 rpm. Then the temperature was naturally cooled down to room temperatu...

Embodiment 2

[0028] Prepare solution 1: Add 10.5g sodium hydroxide and 4.2g sodium aluminate (Al 2 o 3 The weight content is 45%), 7.5g decane bisammonium bromide, 5.36g sodium chloride and 156ml distilled water, stir evenly, then add 4.5g roasted EU-1 seed crystals (the molar ratio of silicon to aluminum is 27). Preparation solution 2: 59.80g silica sol (SiO 2 weight content is 30%) was added into 40ml distilled water, and stirred evenly. Slowly add solution 2 into solution 1, stir evenly, and then put it into a synthesis kettle for dynamic hydrothermal crystallization.

[0029] The crystallization conditions were as follows: the temperature was raised from room temperature to 80° C., and then kept at 80° C. for 1.5 days, and the stirring speed of the synthesis tank was 450 rpm. Then the temperature was raised to 185° C., and the temperature was maintained at 185° C. for 4.5 days. The stirring speed of the synthesis tank was 350 rpm. Then the temperature was naturally cooled down to r...

Embodiment 3

[0032] Prepare solution 1: add 9.84g sodium hydroxide, 3.4g sodium aluminate (Al 2 o 3The weight content is 45%), 13g of decane bis ammonium bromide, 4.47g of sodium chloride and 156ml of distilled water, and stir evenly, then add 5.38g of roasted EU-1 seed crystals (the molar ratio of silicon to aluminum is 27). Preparation solution 2: 59.80g silica sol (SiO 2 weight content is 30%) was added into 60ml distilled water, and stirred evenly. Slowly add solution 2 into solution 1, stir evenly, and then put it into a synthesis kettle for dynamic hydrothermal crystallization.

[0033] The crystallization conditions were as follows: the temperature was raised from room temperature to 100° C., and then kept at 100° C. for 1.2 days, and the stirring speed of the synthesis tank was 350 rpm. Then the temperature was raised to 170° C., and the temperature was maintained at 170° C. for 5 days, and the stirring speed of the synthesis tank was 250 rpm. Then the temperature was naturally...

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Abstract

The invention discloses an NU-87 molecular sieve and a preparation method thereof. The method comprises a preparation process of a crystallization material, a crystallization process and a recovery and treatment process of a crystallization product, wherein in the preparation process of the crystallization material, an aluminum source, a silicon source, alkali, a template agent, inorganic salt, an EU-1 molecular sieve and water are mixed; and the mass ratio of the EU-1 molecular sieve fed into the crystallization material to SiO2 contained in other components is 0.1-0.4. The NU-87 molecular sieve prepared by the method has the advantages of low silicon-aluminum ratio, high pore volume, low cost, and the like.

Description

technical field [0001] The invention relates to a NU-87 molecular sieve and a preparation method thereof. Background technique [0002] NU-87 molecular sieve has NES topology and is a high silica zeolite molecular sieve with two-dimensional microporous structure. It is a two-dimensional microporous system formed by the intersection of 10-membered ring parallel channels with a diameter of 0.47nm×0.60nm and twelve-membered ring channels with a diameter of 0.53nm×0.68nm, and communicates with the outside world only through the ten-membered ring channel window. . This special structure makes NU-87 molecular sieve exhibit both ten-membered and twelve-membered ring characteristics in some catalytic reactions. NES molecular sieves have special physical and chemical properties, and exhibit unique catalytic properties in reactions such as alkylation, isomerization, and disproportionation. [0003] European patent EP377291 and US patent US5041402 first proposed NU-87 molecular siev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04
Inventor 张志智张喜文秦波
Owner CHINA PETROLEUM & CHEM CORP
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