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A kind of mesoporous composite molecular sieve, catalyst and its preparation method and application

A composite molecular sieve and catalyst technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as unproposed solutions, achieve uniform distribution of mesopore channels, low precious metal content, and large specific surface area Effect

Active Publication Date: 2020-10-27
CHINA NAT OFFSHORE OIL CORP +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For the related problems pointed out above, no effective solutions have been proposed so far

Method used

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  • A kind of mesoporous composite molecular sieve, catalyst and its preparation method and application
  • A kind of mesoporous composite molecular sieve, catalyst and its preparation method and application
  • A kind of mesoporous composite molecular sieve, catalyst and its preparation method and application

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preparation example Construction

[0064] A preparation method of USY / MCM-48 mesoporous composite molecular sieve, the preparation method comprises the following steps:

[0065] Mix the USY molecular sieve and the alkali source in the aqueous solution to obtain the first solution;

[0066] dissolving the templating agent in water to obtain a second solution;

[0067] mixing the first solution and the second solution, adjusting the pH to 7-12 to obtain a third solution;

[0068] adding a silicon source to the third solution for crystallization;

[0069] The crystallized product is filtered, washed, dried and roasted to obtain USY / MCM-48 mesoporous composite molecular sieve.

[0070] In this preparation method, the surface is covered with a layer of MCM-48 particles by using USY as the core, so that the combination of the two phases is tighter.

[0071] At the same time, the ratio of the microporous phase to the mesoporous phase in the mesoporous carrier can be controlled by adding different masses of USY micr...

Embodiment 1

[0096] A USY / MCM-48 mesoporous composite molecular sieve, with mesoporous and microporous channel structure, mesopore pore size distribution is 2.0-4.0nm, micropore pore size distribution is 0.4-1.0nm; specific surface area is 1000-1200m 2 / g, the total pore volume is 1.0~1.2cm 3 / g, the mesopore volume accounts for 80-90% of the total pore volume.

[0097] The preparation method of above-mentioned USY / MCM-48 composite molecular sieve is as follows:

[0098] First dissolve 6g of NaOH in 60mL of water, then add 0.5g of dry USY molecular sieve powder into it, and stir in a water bath at 35°C for 1 hour to form the USY molecular sieve precursor;

[0099] Dissolve 4g CTAB and 7g P123 template in 80mL distilled water, stir at 35°C for 1 hour to form a transparent solution, and adjust the pH of the solution to 10 with ammonia water;

[0100] Add the USY molecular sieve precursor solution into the template solution, and stir for 2 hours. Then add 24g of TEOS dropwise to the mixed ...

Embodiment 2

[0103] A USY / MCM-48 mesoporous composite molecular sieve, with mesoporous and microporous channel structure, mesopore pore size distribution is 2.0-4.0nm, micropore pore size distribution is 0.4-1.0nm; specific surface area is 1000-1200m 2 / g, the total pore volume is 0.8~1.0cm 3 / g, the mesopore volume accounts for 70-80% of the total pore volume.

[0104] The preparation method of above-mentioned USY / MCM-48 composite molecular sieve is as follows:

[0105] Firstly, 6g of NaOH was dissolved in 60mL of water, then 1g of dry USY molecular sieve powder was added to it, and stirred in a water bath at 35°C for 1 hour to form a USY molecular sieve precursor;

[0106] Dissolve 4g of CTAB and 7g of P123 template in 80mL of distilled water, stir at 35°C for 1 hour to form a transparent solution, and adjust the pH of the solution to 10 with ammonia water; add USY molecular sieve precursor to the template solution, and stir for 2 hours;

[0107] Then, 18g TEOS was added dropwise into ...

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Abstract

The invention discloses a mesoporous composite molecular sieve, a catalyst and a preparation method and application thereof. The molecular sieve is obtained by using USY molecular sieve as raw material, adding an alkali source, template agent, and silicon source, and performing crystallization treatment; the catalyst includes a carrier and an active component Pt uniformly loaded on the carrier, and the carrier is the above-mentioned Molecular sieve, the particle size distribution of the active component Pt is 1.0 to 5.0 nm, and the Pt loading is 0.1 to 1.0% of the total mass of the catalyst. The present invention also provides preparation methods and applications of the above molecular sieves and catalysts. The catalyst of the present invention uses a mesoporous molecular sieve with high specific surface area as a carrier, which can effectively disperse active components. Under the premise of low noble metal content, the catalyst still has high catalytic activity, and is especially suitable for the selectivity of diesel aromatics. Ring opening reaction.

Description

technical field [0001] The invention relates to the field of preparation of molecular sieves and catalysts, in particular to a mesoporous composite molecular sieve, a catalyst and a preparation method and application thereof. Background technique [0002] The selective hydrogenation and ring-opening technology of aromatics can convert aromatics into alkylbenzenes or cycloalkanes with side chains, and greatly increase the cetane number of catalytic diesel. The core of this technology is to develop bis functional catalyst. [0003] In the ring-opening technology of selective hydrogenation of aromatics, noble metal catalysts have higher hydrogenation activity than other metals, but catalysts loaded with noble metal components have poor sulfur resistance, and usually very low content of sulfur in raw materials will lead to catalyst loss. live. And due to the loading of a certain amount of noble metal, the cost of the catalyst is increased. In addition, the acid properties and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/12B01J35/10C10G45/52C10G45/54
CPCC10G45/52C10G45/54B01J29/005B01J29/0325B01J29/126B01J2229/18B01J35/393B01J35/618B01J35/617B01J35/643B01J35/638B01J35/647
Inventor 刘丽芝刘坚宋君辉王奇金吉海张博韩龙年薛德晟焦祖凯甄涛
Owner CHINA NAT OFFSHORE OIL CORP
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