A kind of IMF structure molecular sieve rich in mesoporous and preparation method thereof

A molecular sieve, IMF technology, applied in molecular sieve catalysts, molecular sieves and alkali exchange compounds, chemical instruments and methods, etc., can solve problems such as narrow pore structure, reduced molecular sieve reactivity, and reduced reaction selectivity.

Active Publication Date: 2020-05-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although IM-5 molecular sieve can have high alkane cracking ability, it is the same as other ten-membered ring molecular sieves. Due to its narrow pore structure, it is difficult for larger reactant molecules such as polycyclic hydrocarbons to enter the crystal pore for reaction, reducing the The effective reaction area of ​​the molecula...

Method used

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preparation example Construction

[0024] The present invention also provides a method for preparing the mesoporous-rich IMF structure molecular sieve provided by the present invention, the preparation method comprising: a, performing the first ammonium exchange treatment on the sodium type IMF structure molecular sieve to obtain the ammonium exchange molecular sieve, wherein, Calculated by sodium oxide and based on the total dry weight of the ammonium-exchanged molecular sieve, the sodium content of the ammonium-exchanged molecular sieve is less than 0.2% by weight; b, the ammonium-exchanged molecular sieve obtained in step a is hydrothermally roasted under a steam atmosphere, obtain the hydrothermally roasted molecular sieve; c, carry out the dealumination treatment on the hydrothermally roasted molecular sieve obtained in the step b in the acid solution, and after filtering and washing, obtain the dealuminated molecular sieve; d, process the dealuminated molecular sieve obtained in the step c in alkali Alkali...

Embodiment 1

[0047] Filter the mother liquor from the crystallized IM-5 molecular sieve (produced by Changling Catalyst Factory, the same below), wash with water, filter and dry; roast the above-mentioned dried molecular sieve in air for 6 hours at a roasting temperature of 550°C to remove the A template agent to obtain a molecular sieve with a sodium-type IMF structure.

[0048] Add 10 times of water and 0.5 times of ammonium chloride to sodium-type IMF structure molecular sieve for the first ammonium exchange treatment. The exchange temperature is 90°C and the exchange time is 2h. , washing and drying to obtain an ammonium-exchanged molecular sieve with a sodium content of less than 0.2% by weight.

[0049] The ammonium-exchanged molecular sieve was hydrothermally calcined at 500° C. for 2 hours in 100% steam to obtain the hydrothermally calcined molecular sieve.

[0050] Take 100 g of hydrothermally roasted molecular sieve (dry basis) and add water to prepare a molecular sieve slurry w...

Embodiment 2

[0063] The crystallized IM-5 molecular sieve was filtered to remove the mother liquor, washed with water, filtered and dried; the above-mentioned dried molecular sieve was roasted in the air for 6 hours at a roasting temperature of 550°C to remove the template agent and obtain a sodium-type IMF structure molecular sieve.

[0064] Add 10 times of water and 0.5 times of ammonium chloride to the sodium-type IMF structure molecular sieve for the first ammonium exchange treatment. The exchange temperature is 70°C and the exchange time is 1h. After the exchange, filter, take the above filter cake and repeat the exchange once and filter , washing and drying to obtain an ammonium-exchanged molecular sieve with a sodium content of less than 0.2% by weight.

[0065]The ammonium-exchanged molecular sieve was hydrothermally calcined at 600° C. for 2 hours under 100% steam to obtain the hydrothermally calcined molecular sieve.

[0066] Take 100 g of hydrothermally roasted molecular sieve (...

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Abstract

The invention discloses a mesopore-rich IMF structure molecular sieve and a preparation method thereof, wherein the mesopore-rich IMF structure molecular sieve has the total specific surface area of 600-700 m<2>/g, the mesoporous specific surface area of 200-300 m<2>/g, and the mesopore volume of 0.26-0.40 ml/g. According to the present invention, the mesopore-rich IMF structure molecular sieve can improve the ring opening rate of polycyclic aromatic hydrocarbons and can reduce the hydrogen transfer reaction in the catalytic cracking of petroleum hydrocarbons or catalytic cracking reactions.

Description

technical field [0001] The invention relates to a mesoporous-rich molecular sieve with IMF structure and a preparation method thereof. Background technique [0002] IM-5 molecular sieve is a molecular sieve with IMF structure, which was first synthesized by Benazzi in 1998. In 2007, the analysis of the structure was completed by Baerlocher et al. The molecular sieve has a two-dimensional ten-membered ring channel structure, and its channel diameter is similar to that of the ZSM-5 molecular sieve, and there is a limited channel in the third dimension. Because of its similar pore structure to ZSM-5 molecular sieve, higher acid content and better hydrothermal stability, it is featured in many catalytic reactions. Corma et al. conducted a series of studies on the catalytic performance of IM-5 molecular sieve and found that it is higher than ZSM-5 molecular sieve in terms of alkane cracking ability. [0003] Although IM-5 molecular sieve can have high alkane cracking ability, ...

Claims

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Application Information

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IPC IPC(8): B01J29/70C01B39/02
CPCB01J29/70C01B39/026C01P2006/12C01P2006/14
Inventor 罗一斌欧阳颖庄立刘建强舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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