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A kind of modification method of Y-type molecular sieve

A molecular sieve and modification technology, applied in molecular sieve catalysts, chemical instruments and methods, catalyst carriers, etc., to achieve the effects of increasing acid content, reducing silicon-aluminum ratio, and large mesopore structure distribution

Active Publication Date: 2019-03-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pore size of the prepared secondary pore structure is mainly concentrated in 3~5nm, and it is still powerless for the conversion of some aromatic hydrocarbon macromolecules with two rings and above. Therefore, the preparation of molecular sieves with larger pore structures is a very important scientific research direction.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Roast the Y-1 molecular sieve at 550°C for 4 hours, then contact the unsaturated olefin with the roasted Y-type molecular sieve, and roast it at 500°C for 2 hours in a nitrogen atmosphere to carry out the carbon deposition reaction. Obtain the Y-type molecular sieve after carbon deposition;

[0024] (2) Under stirring conditions, add the Y-type molecular sieve after carbon deposition into the pressure-resistant container of 0.50mol / L sodium hydroxide solution, the mass ratio of molecular sieve addition to water in the solution is 1:8, and Seal the system, feed nitrogen to control the system pressure to 0.4MPa, then raise the temperature to 70°C, treat at a constant temperature for 2 hours, release the pressure, filter with suction until the pH value is less than 9, dry at 120°C for 12 hours, and finally bake at 550°C After 4 hours, a modified Y-type molecular sieve was obtained. The specific properties of molecular sieves are shown in Table 1.

Embodiment 2

[0026] (1) Roast the Y-1 molecular sieve at 450°C for 6 hours, then contact the unsaturated olefin with the roasted Y-type molecular sieve, and roast it at 550°C for 2 hours in a nitrogen atmosphere to carry out the carbon deposition reaction. Obtain the Y-type molecular sieve after carbon deposition;

[0027] (2) Under stirring conditions, add the Y-type molecular sieve after the carbon deposition into the pressure-resistant container of 0.80mol / L sodium hydroxide solution, the mass ratio of the molecular sieve to the water in the solution is 1:15, and Seal the system, feed air to control the system pressure to 0.6MPa, then raise the temperature to 80°C, treat at a constant temperature for 1 hour, release the pressure, filter with suction until the pH value is less than 9, dry at 110°C for 18 hours, and finally bake at 580°C After 4 hours, a modified Y-type molecular sieve was obtained. The specific properties of molecular sieves are shown in Table 1.

Embodiment 3

[0029] (1) Roast the Y-1 molecular sieve at 600°C for 2 hours, then contact the unsaturated olefin with the roasted Y-type molecular sieve, and roast it at 480°C for 6 hours in a nitrogen atmosphere to carry out the carbon deposition reaction. Obtain the Y-type molecular sieve after carbon deposition;

[0030] (2) Under stirring conditions, add the carbon-deposited Y-type molecular sieve into a pressure-resistant container of 0.60mol / L sodium hydroxide solution. The mass ratio of the amount of molecular sieve added to the water in the solution is 1:10, and Seal the system, feed nitrogen to control the system pressure to 0.2 MPa, then raise the temperature to 60°C, treat at a constant temperature for 3 hours, release the pressure, filter with suction until the pH value is less than 9, dry at 100°C for 24 hours, and finally roast at 520°C After 4 hours, a modified Y-type molecular sieve was obtained. The specific properties of molecular sieves are shown in Table 1.

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Abstract

The invention discloses a method for modifying a Y-type molecular sieve. The method comprises the following steps of (1) performing high-temperature roasting on the Y-type molecular sieve, enabling unsaturated olefin to be in contact with the roasted Y-type molecular sieve, and performing a roasting carbon deposit reaction in an anaerobic atmosphere; and (2) under a stirring condition, adding the Y-type molecular sieve after carbon deposit into a pressure-resistant container of a sodium hydroxide solution, sealing the system, increasing the pressure to be 0.2-0.8 MPa, heating to 50-90 DEG C, performing constant-temperature treatment for 0.5-3 hours, depressurizing, performing suction filtration, drying and roasting, thereby obtaining the Y-type molecular sieve. The Y-type molecular sieve prepared by using the method has relatively large-size mesoporous distribution, relatively more reaction spaces can be provided for large molecules, and the catalysis property of the molecular sieve can be improved.

Description

technical field [0001] The invention relates to a method for modifying a Y-type molecular sieve. The Y-type molecular sieve prepared by the method has more mesoporous structure distribution, which is beneficial to the diffusion of reactants and products in the reaction process. Background technique [0002] Y-type molecular sieve is formed by octahedral molecular sieve cages interpenetrating with each other along three crystal axis directions through twelve-membered rings. It is an excellent catalyst active component, not only has high cracking activity, but also has good selectivity. Therefore, the discovery and use of Y-type molecular sieve has epoch-making significance in the field of catalysis. [0003] Since Y-type molecular sieves with a low silicon-aluminum ratio (the molar ratio of silicon oxide to aluminum oxide is between 3 and 4.2) do not have good hydrothermal stability, they have not been widely studied and widely used in the actual synthesis process and applica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/08B01J29/16B01J32/00B01J35/10C01B39/24C10G47/20
CPCB01J29/084B01J29/166B01J35/1023B01J35/1042B01J2229/14B01J2229/22B01J2229/38C01B39/24C01P2002/72C01P2006/14C10G47/20C10G2300/70
Inventor 秦波杜艳泽柳伟张晓萍
Owner CHINA PETROLEUM & CHEM CORP
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