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Composite carrier with molecular sieve as inner core and preparation method thereof

A composite carrier, molecular sieve technology, applied in molecular sieve catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of catalyst activity reduction, alumina specific surface area reduction, deactivation, etc., to achieve high thermal stability and ensure high temperature. The effect of thermal stability

Pending Publication Date: 2020-08-14
洛阳市科创石化科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a composite carrier with good temperature resistance, which solves the problem that the surface of traditional activated alumina is prone to sintering and changes to the α-phase alumina crystal form under high temperature conditions, resulting in a sharp decrease in the specific surface area of ​​alumina and causing surface loading. Agglomeration of active components leads to technical problems of catalyst activity reduction or even deactivation

Method used

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  • Composite carrier with molecular sieve as inner core and preparation method thereof
  • Composite carrier with molecular sieve as inner core and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] (1) Configuration mixed solution: 77ml water glass (modulus is 3.0 ± 0.1, containing SiO 2 65 g / L) into 56 ml of deionized water and stirred evenly, followed by adding 0.05 g of ZSM-5 powder, 1 g of 20% tetrapropylammonium hydroxide (TPAOH) and 5 g of cetyltrimethylammonium bromide And stir evenly to obtain mixed solution A;

[0029] After 4.45 grams of thorium nitrate and 1.21 grams of zirconium oxychloride were dissolved in 50 ml of deionized water, they were mixed with 11 ml of aluminum sulfate solution (containing Al 2 o 3 90 g / L) and mix uniformly to obtain mixed solution B, slowly add mixed solution B to mixed solution A and stir evenly to obtain mixed solution C;

[0030] (2) Preparation of molecular sieve microcrystals: Add a sodium hydroxide solution with a concentration of 6mol / L to the mixed solution C, adjust the pH value of the solution to 13-14, place it in an autoclave, and heat it to 160 under autogenous pressure. ℃ and stirred, crystallized for 9-1...

Embodiment 2

[0035] (1) Configuration mixed solution: 30.8ml water glass (modulus is 3.0 ± 0.1, containing SiO 2 65 g / L) into 22 ml of deionized water and stirred evenly, followed by adding 0.02 g of ZSM-5 powder, 0.4 g of 20% tetrapropylammonium hydroxide (TPAOH) and 5 g of cetyltrimethylammonium bromide And stir evenly to obtain mixed solution A;

[0036] Dissolve 1.13 g of thorium nitrate in 20 ml of deionized water and mix with 5 ml of aluminum sulfate solution (containing Al 2 o 3 90 g / L) and mixed uniformly to obtain a mixed solution B, which was slowly added to the mixed solution A and stirred evenly to obtain a mixed solution C;

[0037] (2) Preparation of molecular sieve microcrystals: Add a sodium hydroxide solution with a concentration of 6mol / L to the mixed solution C, adjust the pH value of the solution to 13-14, place it in an autoclave, and heat it to 180 under autogenous pressure. ℃ and stirred, crystallized for 5-6 hours, and obtained a molecular sieve microcrystallin...

Embodiment 3

[0042] (1) Configuration mixed solution: 30.8ml water glass (modulus is 3.0 ± 0.1, containing SiO 2 65 g / L) into 22 ml of deionized water and stirred evenly, followed by adding 0.02 g of ZSM-5 powder, 0.4 g of 20% tetrapropylammonium hydroxide (TPAOH) and 5 g of cetyltrimethylammonium bromide And stir evenly to obtain mixed liquid A;

[0043] Dissolve 1.13 g of thorium nitrate in 20 ml of deionized water and mix with 5 ml of aluminum sulfate solution (containing Al 2 o 3 90 g / L) and mixed uniformly to obtain a mixed solution B, which was slowly added to the mixed solution A and stirred evenly to obtain a mixed solution C;

[0044] (2) Preparation of molecular sieve microcrystals: adding a sodium hydroxide solution with a concentration of 6mol / L to the mixed solution C, adjusting the pH value of the solution to 13-14, placing it in an autoclave, and heating to Stir at 195°C, crystallize for 1-2 hours, and obtain a molecular sieve microcrystalline solution after cooling dow...

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Abstract

The invention discloses a composite carrier with a molecular sieve as an inner core and a preparation method of the composite carrier. The composite carrier has a core-shell structure and a multistageaperture, the inner core is the molecular sieve, and an outer shell is alumina and other metal oxides. Firstly, a sodium silicate solution, molecular sieve crystal seeds, a template agent, metal saltand an aluminum sulfate solution are mixed and crystallized to prepare a molecular sieve microcrystal solution; then, an aluminum sulfate solution mixed with metal salt and a sodium metaaluminate solution are added, the acid-base condition of the molecular sieve microcrystal solution is changed, aluminum hydroxide and other metal hydroxide precipitates are generated and aggregated layer by layeroutside the molecular sieve, and precipitates with composite mesopores are formed; and by filtering, washing, drying the precipitates, and roasting the precipitates at a high temperature, the composite carrier of which the inner part is the molecular sieve and the outer part is a mixed crystal of gamma-Al2O3, delta-Al2O3 and other metal oxides is finally formed. The composite carrier can be used in the fields of VOCs treatment, catalytic dehydrogenation, hydrogenation, cracking and the like, and has the advantages of high temperature resistance, good stability and the like.

Description

technical field [0001] The invention relates to the fields of VOCs treatment, catalytic dehydrogenation, hydrogenation, cracking, etc., and specifically relates to a composite carrier with a molecular sieve core and a preparation method thereof. Background technique [0002] The main function of the carrier is to carry and disperse the active components to improve the mass transfer and heat transfer efficiency in the reaction. Activated alumina is a common carrier for exhaust gas purification catalysts, and its specific surface area, pore volume, pore size distribution and thermal stability affect the catalytic performance of the catalyst to a large extent. Under high temperature conditions, γ-Al in the support 2 o 3 、δ-Al 2 o 3 prone to surface sintering and to α-Al 2 o 3 The crystal form changes, which causes the specific surface area of ​​the alumina support to decrease sharply and the catalyst loses its activity. Therefore, the carrier material also needs to have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J37/03B01J35/10
CPCB01J29/405B01J37/03B01J37/0018B01J2229/18B01J35/396B01J35/615B01J35/695B01J35/647
Inventor 龚旭辉魏聪
Owner 洛阳市科创石化科技开发有限公司