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A kind of modification method of Y-type molecular sieve

A molecular sieve and modification technology, applied in the direction of crystalline aluminosilicate zeolite, octahedral crystalline aluminosilicate zeolite, etc., can solve the problems of poor thermal and hydrothermal stability of mesoporous materials, industrial application limitations, and poor hydrothermal stability. , to achieve high efficiency, improve environmental protection efficiency, and simple preparation process

Active Publication Date: 2019-02-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When used as a catalytic material, the thermal and hydrothermal stability of mesoporous materials is usually poor. In 1992, Mobil Corporation synthesized the M41S series mesoporous molecular sieves with larger pore diameters (2-15nm), specific surface area and mesoporous Large volume and strong adsorption capacity, but because the pore wall structure of this type of molecular sieve is amorphous, the hydrothermal stability is poor and the acidity is weak, and the industrial application is limited
[0005] A mesoporous molecular sieve is disclosed in CN1349929A, the primary and secondary structural units of Y-type zeolite are introduced in the molecular sieve wall, so that it has the basic structure of traditional Y-type molecular sieve, but the improvement of its acidity and hydrothermal stability is still very Limited, does not meet FCC usage requirements

Method used

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  • A kind of modification method of Y-type molecular sieve
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Mix deionized water, sodium hydroxide, dimethyloctadecyl[3-(trimethoxysilyl)propyl]ammonium chloride, polyacrylamide with a molecular weight of 30,000 and molecular sieves, and the proportioning ratio is: Molecular sieve (gram): dimethyloctadecyl [3-(trimethoxysilyl) propyl] ammonium chloride (gram): polyacrylamide (gram): sodium hydroxide (mol): water (gram) =10:2.7:6:0.1:90. Put this mixture into a stainless steel sealed reaction kettle, and place it at a constant temperature of 105°C for 10 hours, then filter the mixture, wash with water, and dry it at 110°C for 3 hours, and then roast it at 550°C for 5 hours to obtain a molecular sieve The sample is denoted as MY-1.

[0031] The XRD spectrum of MY-1 is shown in figure 1 . The low temperature nitrogen physical adsorption-desorption curve is shown in figure 2 . The pore size distribution curve calculated according to the BJH model is shown in image 3 .

Embodiment 2

[0033] Deionized water, sodium hydroxide, cyclopentyltrimethoxysilane, polymethacrylate with a molecular weight of 40,000 are mixed with molecular sieves, and the proportioning ratio is: molecular sieve (gram): cyclopentyltrimethoxysilane (gram ): Polymethacrylate (g): NH 4 OH (mole): water (gram) = 10:4:10:0.4:90. Put this mixture into a sealed stainless steel reaction kettle, and place it at a constant temperature of 100°C for 12 hours, then filter the mixture, wash with water, and dry it at 110°C for 3 hours, and then roast it at 550°C for 5 hours to obtain a molecular sieve The sample is denoted as MY-2.

[0034] See also the XRD spectrum of MY-2 figure 1 Characteristics. The low temperature nitrogen physical adsorption-desorption curve is the same as figure 2 Characteristics. The pore size distribution curve calculated according to the BJH model is the same as image 3 Characteristics.

Embodiment 3

[0036] Mix deionized water, sodium hydroxide, 3-(phenylamino)propyltrimethoxysilane, polyacrylamide with a molecular weight of 10,000, and molecular sieves. The ratio is: molecular sieve (g): dimethyl octadecadecane Alkyl[3-(trimethoxysilyl)propyl]ammonium chloride (g): polyacrylamide (g): NH 4 OH (mole): water (gram) = 10:4:10:0.4:90. Put this mixture into a sealed stainless steel reaction kettle, and place it at a constant temperature of 100°C for 12 hours, then filter the mixture, wash with water, and dry it at 110°C for 3 hours, and then roast it at 550°C for 5 hours to obtain a molecular sieve The sample is denoted as MY-3.

[0037] See also the XRD spectrum of MY-3 figure 1 Characteristics. The low temperature nitrogen physical adsorption-desorption curve is the same as figure 2 Characteristics. The pore size distribution curve calculated according to the BJH model is the same as image 3 Characteristics.

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Abstract

A modification method for a Y type molecular sieve is characterized in that a NaY molecular sieve is mixed with an inorganic alkali, a silicon oxygen group-containing small-molecular compound and a macro-molecular anionic compound solution, then the mixture is treated for at least 0.5 h at the temperature of 70-200 DEG C in a closed reaction kettle, and a product is recovered, wherein the mixing ratio of the NaY molecular sieve to the inorganic alkali to the silicon oxygen group-containing small-molecular compound to the macro-molecular anionic compound is 10 to (0.05-0.5) to (0.1-10) to (0.5-10). The method has the advantages of simple preparation process and high efficiency, and the mesoporous Y type molecular sieve can be obtained, has the pore size distribution concentrating on 3-4 nm and has large pores with the size of more than 50 nm.

Description

technical field [0001] The invention relates to a method for modifying a Y-type molecular sieve. 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. As the main cracking component, Y-type molecular sieve, as a microporous material, has a pore size of only 0.74nm, and its pore diffusion is severely restricted, making it easily deactivated by carbon deposition in the catalytic reaction, and extremely It is prone to many secondary reactions (Cohen ER. Quantities, units and symbols in physical chemistry: Royal Society of Chemistry; 2007). [0003] In order to overcome the defects of conventional microporous molecular sieves, reducing the crystal ...

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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