Method for preparing grade porous ZMS (Zeolite Socony Mobil)-5 molecular sieve by acid-base coupling

A technology of ZSM-5 and hierarchical pores, which is applied in the direction of crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., can solve the problems of easy carbon deposition, structural collapse, damage, etc., to avoid catalyst , low cost and simple process

Inactive Publication Date: 2014-05-28
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using high-temperature heat treatment method, during high-temperature treatment, the ZSM-5 molecular sieve with hierarchical pore structure is prone to structural collapse, and the mesopore structure disappears; water vapor treatment, as an ultra-stabilization treatment, has limited mesopores produced by catalytic cracking Y-type molecular sieve treatment, and at the same time Water vapor treatment enriches a large number of extra-framework aluminum species on the surface of Y-type molecular sieve; acid treatment destroys the crystal structure, dissolves amorphous Al species, and produces secondary mesopores, but ZSM-5 m

Method used

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  • Method for preparing grade porous ZMS (Zeolite Socony Mobil)-5 molecular sieve by acid-base coupling
  • Method for preparing grade porous ZMS (Zeolite Socony Mobil)-5 molecular sieve by acid-base coupling
  • Method for preparing grade porous ZMS (Zeolite Socony Mobil)-5 molecular sieve by acid-base coupling

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Embodiment 1

[0039] Choose ZSM-5 with a silicon-aluminum ratio of 38, ZSM-5:NaOH:H 2 O was stirred evenly at a mass ratio of 1:0.24:30 to make a slurry, placed in a water bath and heated to 80°C, and stirred for 30 minutes. Then cool to room temperature to filter, first wash with water, then wash with nitric acid, and finally dry in an oven at 110°C for 12 hours, and ion-exchange the obtained sample with ammonium nitrate. Ion exchange conditions: alkali treatment ZSM-5: NH 4 NO 3 The solid-liquid ratio is 1g:30mL, and the ion exchange temperature is 80°C. Finally, the sample is filtered, dried, and calcined at 550°C for 4 hours. The sample is designated as AT-6.

[0040] Figure 4 NH for samples AT-3 and AT-6 3 -TPD spectrum, AT-3 and AT-6 samples have three desorption peaks at 170°C, 230°C, and 470°C respectively, indicating that AT-3 has weak acid sites, medium strong acid sites and strong acid sites. But after HNO 3 In the washed samples, the amount of acid corresponding to the we...

Embodiment 2

[0042] Choose ZSM-5 with a silicon-aluminum ratio of 38, and mix ZSM-5:NaOH:H 2 O was stirred evenly at a mass ratio of 1:0.24:30 to make a slurry, placed in a water bath and heated to 80°C, and stirred for 30 minutes. Then it was cooled to room temperature, filtered, washed with water, and finally dried in an oven at 110°C for 12 hours, and the obtained sample was ion-exchanged with ammonium nitrate. Ion exchange conditions: alkali treatment ZSM-5: NH 4 NO 3 The solid-to-liquid ratio is 1g:30mL, and the exchange temperature is 80°C. Finally, the sample is filtered, dried, and calcined at 550°C for 4 hours. The sample is designated as AT-7.

[0043] Figure 5 The adsorption-desorption curves of samples AT-3 and AT-7, after ion exchange, the specific surface area of ​​the samples increased by 100m 2 / g, the specific surface area of ​​micropores is basically unchanged, and the specific surface area of ​​mesopores is increased by 70m 2 / g, the mesopore volume increased by 0....

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Abstract

The invention relates to a method for preparing a ZSM (Zeolite Socony Mobil)-5 in a grade structure, and specifically relates to a method for preparing a grade porous ZMS-5 molecular sieve by acid-base coupling. The method comprises the following steps: mixing commercial ZSM-5 and alkali liquor in proportion, and heating and stirring to form a suspension; filtering the suspension; washing the filter cakes by water or acidic liquor; and finally, carrying out ion exchange by using acidic ammonium salt liquor; and then, roasting to obtain the grade porous ZMS-5 molecular sieve. The method provided by the invention aims to prepare the ZSM-molecular sieve rich in secondary mesopores. Firstly, part of aluminum silicon species in the ZSM-5 is removed in an environment-friendly alkali treatment manner to prepare the ZSM-5 molecular sieve with a secondary pore structure. Based on the secondary pore formed, undefined structures on the surface of the ZSM-5 and in the duct are dissolved out by way of acid washing or ion exchange. Meanwhile, the pore volume and the specific surface area of the secondary mesopore-enriching ZSM-5 molecular sieve are improved. Through the acid-base coupling treatment, the distribution state of aluminum outside the framework on the surface of the ZSM-5 is improved, so that the secondary mesopore-enriching ZSM-5 molecular sieve prepared by the method has a huge application potential in catalytic cracking and hydrocracking.

Description

technical field [0001] The invention relates to a method for preparing ZSM-5 with hierarchical structure, in particular to a method for preparing ZSM-5 molecular sieve with hierarchical pores through acid-base coupling. Background technique [0002] ZSM-5 molecular sieve is a kind of aluminosilicate molecular sieve with MFI crystal structure, which is widely used in petrochemical field, such as catalytic cracking, diesel decondensation, xylene isomerization, etc. With the increasingly heavy crude oil, the macromolecules of crude oil cannot effectively contact the acidic active sites, and the adsorption and desorption of reactants and products in the pores are hindered, resulting in secondary cracking and increased coke production, making ZSM-5, etc. The active sites on the surface of the catalyst are covered, which leads to a decrease in the conversion rate of the reaction, and finally makes the catalyst deactivate rapidly. Therefore, developing high-efficiency ZSM-5 cataly...

Claims

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Application Information

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IPC IPC(8): C01B39/38
Inventor 阎子峰王有和张占全乔柯宋春敏张志华秦丽红高雄厚张忠东
Owner PETROCHINA CO LTD
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