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A kind of mesoporous molecular sieve and preparation method thereof

A technology of mesoporous molecular sieve and molecular sieve, which is applied in the field of mesoporous molecular sieve and its preparation, can solve the problems of small pore size of mesoporous molecular sieve, limited application range, long process, etc., achieve high specific surface area and improve environmental protection efficiency

Active Publication Date: 2019-07-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above methods have high requirements on the silicon-aluminum ratio of molecular sieves, the process is long, and the obtained mesoporous molecular sieves have small pore sizes, and the application range is limited to a certain extent.

Method used

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  • A kind of mesoporous molecular sieve and preparation method thereof
  • A kind of mesoporous molecular sieve and preparation method thereof
  • A kind of mesoporous molecular sieve and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This comparative example illustrates the result of depolymerization of ordinary NaY molecular sieve with low silicon-aluminum ratio and crystallization with the addition of template agent.

[0043] NaY type molecular sieve (83% crystallinity, 5.2 silicon-aluminum ratio, the same below) was treated in glycerin at 190°C for 2 hours, the mass mixing ratio of Y type molecular sieve and glycerin was 1:6, and the inorganic guiding agent was prepared according to Al 2 o 3 : 14SiO 2 : 15Na 2 O: 260H 2 Molar ratio of O Mix water glass, aluminum sol and water and age for 18 hours, then mix the resulting mixture with inorganic guiding agent at 70°C for 1 hour, the mass mixing ratio of Y-type molecular sieve and inorganic guiding agent is 1:0.6, and then Mix the obtained mixed liquid and polyacrylamide at 60°C for 1 hour, the mass mixing ratio of Y-type molecular sieve and polyacrylamide with a molecular weight of 8000 is 1:0.3, and then treat it in a closed reactor at 100°C for...

Embodiment 2

[0046] NaY molecular sieves were treated in glycerol at 200°C for 2 hours, the mass mixing ratio of Y molecular sieves and glycerin was 1:8, and the inorganic directing agent was prepared according to Al 2 o 3 : 14SiO 2 : 15Na 2 O: 260H 2 The molar ratio of O is obtained by mixing water glass, aluminum sol and water and aging for 20 hours, then mixing the obtained mixed solution, inorganic directing agent and polymethacrylate with a molecular weight of 10,000 at 80°C for 1 hour, Y-type molecular sieve, The mass mixing ratio of inorganic directing agent and polymethacrylate is 1:0.5:0.5, and then treated in a closed reactor at 100°C for 12 hours, the mixture was filtered, washed with water, and dried at 100°C for 5 hours, and then Calcined at 550°C for 5 hours to obtain a molecular sieve sample, denoted as MY-2.

[0047] The XRD spectrum of MY-2 is the same as figure 1 Characteristics. The low temperature nitrogen physical adsorption-desorption curve is the same as figu...

Embodiment 3

[0049] NaY molecular sieves were treated in glycerol at 200°C for 2 hours, the mass mixing ratio of Y molecular sieves and glycerin was 1:5, and the inorganic directing agent was prepared according to Al 2 o 3 : 15SiO 2 : 16Na 2 O: 350H 2 The molar ratio of O is obtained by mixing silicon source, aluminum source and water and aging for 20 hours, then mixing the obtained mixed solution, inorganic directing agent and polyacrylamide with a molecular weight of 15,000 at 80°C for 1 hour, Y-type molecular sieve, inorganic The mass mixing ratio of directing agent and polyacrylamide is 1:0.7:0.8, and then treated in a closed reactor at 110°C for 4 hours, the mixture was filtered, washed with water, and dried at 100°C for 5 hours, and then placed at 550°C Calcined at high temperature for 5 hours to obtain a molecular sieve sample, denoted as MY-3.

[0050] The XRD spectrum of MY-3 is the same as figure 1 Characteristics. The low temperature nitrogen physical adsorption-desorption...

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Abstract

A mesoporous molecular sieve is characterized in that the molecular sieve has an FAU crystal structure, the relative crystallinity is greater than 70%, the mesopore volume accounts for 30-70% of the total pore volume, and the BET test shows that the pore volume of mesopores with the pore size of 10-22 nm accounts for 60% or more of the mesopores.

Description

technical field [0001] The invention relates to a mesoporous molecular sieve and a preparation method thereof. Background technique [0002] Y-type molecular sieves (HY, REY, USY) have been the main active components of catalytic cracking (FCC) catalysts since they were first used in the 1960s. However, with the intensification of heavy crude oil, the content of polycyclic compounds in FCC feedstock increased significantly, but its diffusion capacity in zeolite channels decreased significantly. In order to overcome the defects of conventional microporous molecular sieves, reducing the crystal size of molecular sieves and introducing mesopores into molecular sieve crystals can effectively improve their diffusion properties. Compared with traditional microporous molecular sieves, mesoporous molecular sieves have excellent internal and external diffusion properties, exhibit unique catalytic activity in the catalytic reaction of polymers, and can delay catalyst deactivation and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/24
Inventor 李文林达志坚罗一斌郑金玉
Owner CHINA PETROLEUM & CHEM CORP
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