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Gradient acid distributed ZSM-5 molecular sieve and preparation method thereof

A technology of ZSM-5 and molecular sieve, which is applied in the direction of crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., can solve the problems that the acid properties cannot meet its needs and the shape-selective properties cannot be applied, etc. To achieve the effect of highlighting the reaction effect

Active Publication Date: 2013-02-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For some reaction processes that require superacids or the reaction processes in which superacids are combined with strong acids and weak acids, the acid properties of ZSM-5 molecular sieves prepared by the prior art cannot meet their needs, and their good shape-selective properties cannot be applied.

Method used

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  • Gradient acid distributed ZSM-5 molecular sieve and preparation method thereof
  • Gradient acid distributed ZSM-5 molecular sieve and preparation method thereof
  • Gradient acid distributed ZSM-5 molecular sieve and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0020] In the first step, add 1.6g of sodium hydroxide and 1.2g of aluminum sulfate to 140ml of deionized water respectively, weigh 7.5g of tetrapropylammonium bromide and add it to the solution, stir for half an hour, add 15ml of silica sol, and stir evenly , put into a stainless steel crystallization kettle, crystallize at a constant temperature of 180°C for 12 hours, and then cool to room temperature.

[0021] Synthetic raw material ratio: Al 2 o 3 :50SiO2 2 :15.6 TPA + :11.1Na 2 O:4700H 2 o

[0022] The second step is to stir the cooled mixture after crystallization. After stirring evenly, add 1.2g of aluminum sulfate directly, then stir for 2.0h, put it into a stainless steel crystallization kettle, and crystallize at a constant temperature of 180°C for 18 hours, then cool to room temperature , washed, dried and calcined to obtain ZSM-5 molecular sieve.

Embodiment approach 2

[0024] In the first step, add 1.8g of sodium hydroxide and 1.2g of aluminum sulfate to 120ml of deionized water respectively, weigh 7.5g of tetrapropylammonium bromide and add it to the solution, stir for half an hour, add 20ml of silica sol, and stir evenly , put into a stainless steel crystallization kettle, crystallize at a constant temperature of 180°C for 18 hours, and then cool to room temperature.

[0025] Synthetic raw material ratio: Al 2 o 3 :67SiO2 2 :15.6 TPA + :12.5Na 2 O:4222H 2 o

[0026] The second step is to stir the cooled mixture after crystallization. After stirring evenly, add 0.5g of aluminum nitrate directly, then stir for 2.0h, put it into a stainless steel crystallization kettle, crystallize at a constant temperature of 140°C for 24 hours, and then cool to room temperature , washed, dried and calcined to obtain ZSM-5 molecular sieve.

Embodiment approach 3

[0028] In the first step, add 1.6g of sodium hydroxide and 1.2g of aluminum sulfate to 150ml of deionized water respectively, weigh 10g of tetrapropylammonium bromide and add it to the solution, stir for half an hour, add 25ml of silica sol, and stir evenly. Put it into a stainless steel crystallization kettle, crystallize at a constant temperature of 140°C for 48 hours, and then cool to room temperature.

[0029] Synthetic raw material ratio: Al 2 o 3 :83SiO2 2 :20.8 TPA + :11.1Na 2 O:5277H 2 o

[0030] The second step is to stir the cooled mixture after crystallization. After stirring evenly, add 1.2g of aluminum sulfate directly, then stir for 2.0h, put it into a stainless steel crystallization kettle, and crystallize at a constant temperature of 180°C for 18 hours, then cool to room temperature , washed, dried and calcined to obtain ZSM-5 molecular sieve.

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Abstract

The invention discloses a gradient acid distributed ZSM-5 molecular sieve and a preparation method thereof. The ZSM-5 molecular sieve prepared by the method has a molar ratio of silicon oxide to alumina being 25-200, and simultaneously has weak acid, strong acid and super acid. The ZSM-5 molecular sieve having gradient acid distribution is obtained by supplementing an aluminium source to the ZSM-5 molecular sieve for a secondary synthesis. The ZSM-5 molecular sieve product obtained by the method has gradient acid properties, and has wide application prospects in the field of isomerization, alkylation, catalytic cracking and the like.

Description

technical field [0001] The invention belongs to the field of molecular sieve synthesis, and in particular relates to a ZSM-5 molecular sieve with gradient acid distribution and a preparation method thereof. Background technique [0002] The artificial synthesis of zeolite molecular sieves began in 1948. Zeolite chemists headed by Barrer successfully imitated the natural zeolite production environment and synthesized the first batch of zeolite molecular sieves with a low silicon-aluminum ratio under hydrothermal conditions, which was a great step forward in the molecular sieve industry and science laid the foundations of science. Molecular sieves are composed of silicon oxide [SiO 4 ] and aluminum oxide [AlO 4 ] tetrahedra share oxygen atoms as the basic structural unit, these [TO 4 ] The tetrahedrons are staggered into a spatial network structure, with a relatively open skeleton structure, a large specific surface area, and a regular and uniform pore structure. [0003] ...

Claims

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Application Information

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IPC IPC(8): C01B39/40
Inventor 秦波张喜文张志智刘全杰
Owner CHINA PETROLEUM & CHEM CORP
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