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Modified Y-type molecular sieve and preparation method and application thereof

A molecular sieve and modification technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as excess conversion, improve product selectivity and broad application prospects Effect

Active Publication Date: 2020-05-05
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, which is somewhat excessive for the conversion of some small molecules. Therefore, it is an important research direction to prepare Y molecular sieves with appropriate pore structure and apply them to the oil refining process of smaller molecules.

Method used

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  • Modified Y-type molecular sieve and preparation method and application thereof
  • Modified Y-type molecular sieve and preparation method and application thereof
  • Modified Y-type molecular sieve and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The NaY type molecular sieve raw material is subjected to the first ion exchange, and then the obtained NaNH 4 Y was placed in a high-temperature furnace at 750°C for 2.0 hours at a constant temperature, and then the second ion exchange was performed again, and then the obtained NH 4 Under the pressure of 0.25MPa, carry out constant temperature treatment in a hydrothermal furnace at 550°C for 1.5 hours, and finally treat the hydrothermally treated molecular sieve at 60°C with 1.5mol / L hydrochloric acid solution under stirring 1.5 hours, then washed to neutral, and dried at 90°C for 18 hours to obtain a modified Y-type molecular sieve with low crystallinity. The specific properties of molecular sieves are shown in Table 1.

[0024] The ammonium salt used in the first ion exchange process is ammonium chloride, the solid-liquid ratio of ion exchange is 1:8 (g / ml), the concentration of ammonium solution is 1.0mol / L, and the ion exchange temperature is 80°C. The constant t...

Embodiment 2

[0026] The NaY type molecular sieve is subjected to the first ion exchange, and then the obtained NaNH 4 Y was placed in a high-temperature furnace at 650°C for 3.0 hours at a constant temperature and then subjected to ion exchange for the second time, and then the obtained NH 4 Under the pressure of 0.15MPa, Y was subjected to constant temperature treatment in a hydrothermal furnace at 600°C for 2.0 hours, and finally the hydrothermally treated molecular sieve was treated at 90°C with 0.8mol / L nitric acid solution under stirring for 2.0 hours. hours, then washed to neutral, and dried at 100°C for 12 hours to obtain a modified Y-type molecular sieve with low crystallinity. The specific properties of molecular sieves are shown in Table 1.

[0027] The ammonium salt used in the first ion exchange process is ammonium sulfate, the solid-liquid ratio of ion exchange is 1:10 (g / ml), the concentration of ammonium solution is 1.6mol / L, and the ion exchange temperature is 90°C. The c...

Embodiment 3

[0029] The NaY type molecular sieve is subjected to the first ion exchange, and then the obtained NaNH 4 Y was placed in a high-temperature furnace at 800°C for 2.0 hours at a constant temperature, and then the second ion exchange was performed again, and then the obtained NH 4 Under the pressure of 0.08MPa, Y was subjected to a constant temperature treatment in a hydrothermal furnace at 450°C for 3.0 hours, and finally the hydrothermally treated molecular sieve was treated at 60°C with 1.6mol / L acid solution under stirring for 1.0 hours, then washed to neutral, and dried at 110°C for 16 hours to obtain a modified Y-type molecular sieve with low crystallinity. The specific properties of molecular sieves are shown in Table 1.

[0030] The ammonium salt used in the first ion exchange process is ammonium nitrate, the solid-liquid ratio of ion exchange is 1:12 (g / ml), the concentration of ammonium solution is 2.0mol / L, and the ion exchange temperature is 90°C. The constant tempe...

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Abstract

The invention discloses a preparation method of a modified Y-type molecular sieve, comprising the following steps: (1) partially exchanging NaY-type molecular sieve sodium ions by using an ammonium salt solution, and carrying out high-temperature roasting on the obtained NaNH4Y molecular sieve; (2) exchanging sodium ions in the material obtained in the step (1) again by adopting an ammonium salt solution, and carrying out hydrothermal treatment on the obtained material; and (3) carrying out acid treatment on the material obtained in the step (2), and drying to obtain the modified Y-type molecular sieve. The modified Y molecular sieve prepared by the method has low crystallinity and moderate pore volume, thus providing a proper reaction space for diesel fractions and improving the catalyticselectivity of the molecular sieve; meanwhile, the preparation method is simple and suitable for industrial application.

Description

technical field [0001] The invention relates to a modified Y-type molecular sieve and its preparation method and application, in particular to a modified Y-type molecular sieve and its preparation method and its use in the diesel fraction hydrocracking 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 application. attention....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/24C10G47/12B01J29/16
CPCC01B39/24C10G47/12B01J29/166B01J23/002B01J2523/00C01P2006/12C01P2002/72C01P2006/14B01J2523/31B01J2523/68B01J2523/847
Inventor 秦波杜艳泽柳伟高杭
Owner CHINA PETROLEUM & CHEM CORP
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