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Molecular sieve-coating cerium oxide composite material and preparation method thereof

A composite material and cerium oxide technology, which is applied in the field of preparation of cerium oxide composite materials, can solve the problems of reducing the surface acidity of ZSM-5 zeolite, and cannot be fully displayed and utilized, so as to improve thermal stability and oxygen storage and release performance , improve the ability of anti-carbon deposition, and generate low cost effects

Inactive Publication Date: 2015-04-08
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Composite materials prepared by such methods can reduce the surface acidity of ZSM-5 zeolite to a large extent, and ZSM-5 has the advantages of higher surface area, better thermal stability and hydrothermal stability, and also cannot be fully displayed and utilized

Method used

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  • Molecular sieve-coating cerium oxide composite material and preparation method thereof
  • Molecular sieve-coating cerium oxide composite material and preparation method thereof
  • Molecular sieve-coating cerium oxide composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 0.469g of sodium chloride, 5.625g of tetrapropylammonium hydroxide, and 3.27g of ethyl orthosilicate to 40g of deionized water, stir for 10 minutes, then add 0.1g of aluminum isopropoxide, and ultrasonicate for 15 minutes, then the solution is in Continue stirring at room temperature for 24 h; add 0.75 g of cerium oxide nanosheets, ultrasonically disperse, and stir for 4 h, then transfer the solution into a crystallization kettle with a polytetrafluoroethylene liner. ) Hydrothermal treatment at 110°C for 24h, 170°C for 48h, then cooled to room temperature, filtered, washed, dried at 110°C for 12h, placed in a muffle furnace and roasted at 450°C for 4h to obtain the attached figure 1 The ZSM-5 molecular sieve-ceria composite shown.

Embodiment 2

[0030] Add 0.310g of sodium chloride, 5.625g of tetrapropylammonium hydroxide, and 3.27g of ethyl orthosilicate into 25g of deionized water, stir for 10 minutes, add 0.1g of aluminum isopropoxide, and ultrasonicate for 15 minutes, then gel Continue stirring at room temperature for 24 h; add 0.75 g of cerium oxide nanosheets, ultrasonically disperse, and after stirring for 4 h, transfer the gel into a crystallization kettle with a polytetrafluoroethylene liner. / min) 110°C hydrothermal treatment for 24h, 170°C hydrothermal treatment for 48h, cooled to room temperature, filtered, washed, dried at 110°C for 12h, placed in a muffle furnace and roasted at 450°C for 4h to obtain the attached figure 2 The ZSM-5 molecular sieve-coated cerium oxide composite is shown.

Embodiment 3

[0032]Add 0.310g of sodium chloride, 1.5g of polyethylene glycol 600, 5.625g of tetrapropylammonium hydroxide, and 0.1g of aluminum isopropoxide into 25g of deionized water, sonicate for 15 minutes, stir for 10 minutes, and then add 3.27g of orthosilicon Then, the resulting gel was stirred at room temperature for 24 h; 1 g of cerium oxide nanosheets was added, ultrasonically dispersed, and after stirring for 4 h, the gel was transferred to a crystallization kettle with a polytetrafluoroethylene liner. Under the condition of rotation (60 rpm), hydrothermal treatment at 110°C for 24h, hydrothermal treatment at 170°C for 48h, cooling to room temperature, filtering, washing, drying at 110°C for 12h, and roasting in a muffle furnace at 450°C After 4h vested image 3 The ZSM-5 molecular sieve-coated cerium oxide composite is shown.

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Abstract

The invention discloses a preparation method of a ZSM-5 zeolite molecular sieve-coating cerium oxide composite material. Cerium oxide is dispersed in a mother liquor for synthesizing a molecular sieve by adopting an in-situ hydrothermal method, and hydrolytic condensation polymerization, two-step in-situ hydrothermal reaction, cleaning, drying and roasting are carried out based on the mother liquor containing the cerium oxide to obtain the molecular sieve-coating cerium oxide composite material. According to the prepared molecular sieve / cerium oxide composite material, the molecular sieve uniformly and compactly covers the surface of the cerium oxide, the specific surface area is high, the thermal stability and the oxygen storage and release property of the cerium oxide can be greatly improved, and the cerium oxide has the rich surface acidity. In addition, the cerium oxide also has the certain oxidization capacity to the molecular sieve, so that the carbon deposition prevention capacity of the molecular sieve is greatly improved, and the molecular sieve-coating cerium oxide composite material can be used as a two-function catalyst simultaneously having an acid catalytic function and an oxidization catalytic function. The composite material can be widely applied to the fields such as the reaction catalyzed by solid acid at high temperature, such as catalytic cracking, volatile organic pollutant catalytic combustion, and automobile exhaust catalytic purification (a three-way catalyst carrier and a hydrocarbon trapping catalyst).

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic nanometer materials and solid catalysts, and in particular relates to a preparation method of a molecular sieve-coated cerium oxide composite material. Background technique [0002] Cerium oxide has strong redox properties (Ce 3+ / C 4+ ), oxygen storage and release capacity, and its strong absorption of ultraviolet rays are widely used in modern high-tech fields such as gas sensors, optical materials, ultraviolet absorbers, high-temperature oxygen-sensitive materials, solid oxide fuel cells, and three-way catalysts. Especially as a catalytic material, it has outstanding advantages in the fields of three-way catalysis and catalytic oxidation (catalytic combustion of volatile organic pollutants, oxidative dehydrogenation), but its poor thermal stability limits its application to a certain extent. MFI-type molecular sieves (such as ZSM-5) have a two-dimensional pore structure, and ...

Claims

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Application Information

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IPC IPC(8): B01J29/40B01J32/00
Inventor 戴启广白树行施冰冰王幸宜
Owner EAST CHINA UNIV OF SCI & TECH
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