Ultrafine molecular sieve structured catalytic material based on porous silicon carbide carrier and preparation thereof

A technology of porous silicon carbide and catalytic materials, applied in molecular sieve catalysts, physical/chemical process catalysts, chemical instruments and methods, etc.

Active Publication Date: 2012-10-10
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the current research on structured ultrafine molecular sieve catalysts is still in the labor...

Method used

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  • Ultrafine molecular sieve structured catalytic material based on porous silicon carbide carrier and preparation thereof
  • Ultrafine molecular sieve structured catalytic material based on porous silicon carbide carrier and preparation thereof
  • Ultrafine molecular sieve structured catalytic material based on porous silicon carbide carrier and preparation thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] In this embodiment, the preparation method of the superfine ZSM-5 molecular sieve coating on the surface of the foamed silicon carbide carrier:

[0043] First, the surface of the porous silicon carbide carrier is modified by using a colloidal zeolite seed crystal directing agent. For the method of the colloidal zeolite seed crystal directing agent, refer to the silicon carbide ceramic surface mentioned in the Chinese invention patent application (application number: CN200910013245.7). Porous zeolite molecular sieve coating material and its preparation method: mix ethyl orthosilicate, tetrapropylammonium hydroxide, and deionized water in a molar ratio of 1:0.32:29, and after the ethyl orthosilicate is completely hydrolyzed, the above The solution was placed in a reaction kettle for hydrothermal synthesis, and hydrothermal synthesis was carried out at 120° C. for 4 hours to obtain the zeolite precursor sol. The foamed silicon carbide carrier is impregnated in the zeolite ...

Embodiment 2

[0046] In this example, the preparation method of the ultrafine β molecular sieve coating on the surface of the foamed silicon carbide carrier:

[0047] First, the surface of the foamed silicon carbide carrier is modified by cationic polymers, and the specific process is to immerse the foamed silicon carbide carrier in a 50 wt % tetraethylammonium hydroxide solution for 2 hours. Mix ethyl orthosilicate, sodium metaaluminate, tetraethylammonium hydroxide, and deionized water in a molar ratio of 1:0.5:0.5:20. After the tetraethyl orthosilicate is completely hydrolyzed, the surface-modified foamed silicon carbide carrier and the above solution are placed in a reaction kettle, and hydrothermally synthesized at 140° C. for 48 hours to prepare a β ultrafine molecular sieve precursor. Adding 8wt% polyvinylamine and 1.5wt% polyvinyl alcohol to the precursor as pore-forming agents. Soak the foamed silicon carbide carrier in the colloid for 20 minutes, blow off excess slurry, and dry at ...

Embodiment 3

[0049] In this embodiment, the preparation method of the superfine Y-type molecular sieve coating material on the surface of the honeycomb silicon carbide carrier:

[0050] First, use concentrated nitric acid to modify the surface of the foamed silicon carbide carrier. The specific process is to treat the honeycomb silicon carbide carrier in concentrated nitric acid for 30 minutes. Mix ethyl orthosilicate, aluminum isopropoxide, sodium hydroxide, tetramethylammonium hydroxide, and deionized water in a molar ratio of 1:0.6:0.006:0.8:100). After the tetraethyl orthosilicate is completely hydrolyzed, the surface-modified foamed silicon carbide carrier and the above solution are placed in a reaction kettle, and hydrothermally synthesized at 95° C. for 24 hours to prepare an ultrafine Y molecular sieve precursor. 12 wt% polyether and 1.5 wt% sodium carboxymethyl cellulose are added therein as pore-forming agents. Soak the foamed silicon carbide carrier in the colloid for 20 minute...

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Abstract

The invention, belonging to the technical field of catalyst and its application, particularly relates to an ultrafine molecular sieve structured catalytic material based on a porous silicon carbide carrier and a preparation method thereof. The material comprises ultrafine molecular sieve crystals as active elements and has a hierarchically porous structure, and the whole ultrafine molecular sieve coating has catalytic activity. The method is characterized by coating a colloidal molecular sieve precursor on the surface of a modified foam silicon carbide carrier, converting the molecular sieve precursor into ultrafine molecular sieve crystals by vapor phase treatment to realize the firm combination between the coating and the carrier. According to the invention, by controlling the synthesis conditions of the colloidal molecular sieve precursor and the method of adding a pore forming agent, the size of the molecular sieve crystals, silica-alumina ratio and intercrystalline porosity can be controlled; a pore structure and the type of the molecular sieve can be designed according to the geometrical structure of a target product; and the capacity of accommodating carbon is raised, the mass transfer capability of the catalyst is reinforced, and the life of catalyst is prolonged while keeping the high activity of the ultrafine molecular sieve and high target product selectivity.

Description

technical field [0001] The invention belongs to the technical field of catalysts and their applications, in particular to an ultrafine (including nanometer or submicrometer) molecular sieve structured catalytic material based on a porous silicon carbide carrier and a preparation method thereof. Background technique [0002] In recent years, with the development of nanoscience and nanomaterial preparation technology, many ultrafine molecular sieves (nano or submicron) have come out one after another, showing broad application prospects in the petrochemical industry. Compared with conventional micron molecular sieves, ultrafine molecular sieves have the characteristics of large surface area, large mesopore volume and short pore channels, so they often show the advantages of high catalytic activity, strong anti-coking ability, and long-lasting stability. , fluid catalytic cracking, alkylation of benzene, oligomerization of olefins, methanol to gasoline, synthesis of methylamine...

Claims

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Application Information

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IPC IPC(8): B01J29/40B01J29/08B01J29/70B01J35/10
Inventor 张劲松矫义来杨振明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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