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A monolithic clustered alumina-supported catalyst and its application

A kind of alumina carrier and monolithic technology, applied in the direction of physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, catalyst carrier, etc., can solve the problem that the original shape cannot be maintained

Active Publication Date: 2020-05-05
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the hierarchical structure activated alumina is used as a coating of the monolithic structure carrier, it often cannot maintain its original shape, so that the hierarchical structure and the monolithic structure cannot give full play to their respective advantages.

Method used

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  • A monolithic clustered alumina-supported catalyst and its application
  • A monolithic clustered alumina-supported catalyst and its application
  • A monolithic clustered alumina-supported catalyst and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Take a commercially available cordierite honeycomb ceramic with a pore density of 400psi, cut it into a substrate with a size of 1.0cm×1.0cm×2.5cm, and weigh 1.175g, immerse it in a 50wt% nitric acid solution, and perform pretreatment at 30°C for 24h , washed and dried, and then baked at 1200°C for 6h. Weigh aluminum nitrate (Al(NO 3 ) 3 9H 2 (2) 0.1mol and urea 1.0mol are placed in a beaker, add deionized water and absolute ethanol at room temperature, so that the volume ratio of ethanol and water in the solution is 20:1, and the molar concentration of aluminum ions is 4mol / L, stir Until the solids are all dissolved, move the solution into a high-pressure hydrothermal kettle, and immerse it into the pretreated cordierite honeycomb ceramic matrix. The volume ratio of the solution to the ceramic matrix is ​​10:1, and the pH is adjusted with ammonia water (weight concentration: 25%) value to neutral, then seal the hydrothermal kettle. Put the hydrothermal kettle in a ...

Embodiment 2

[0082] Take a commercially available mullite honeycomb ceramic with a pore density of 600cpsi, cut it into a matrix with a size of 1.0cm×1.0cm×2.5cm, and weigh 0.975g, and immerse it in a 20wt% oxalic acid solution at 50°C for 10h , washed and dried, and baked at 1200°C for 6h. Weigh aluminum nitrate (Al(NO 3 ) 3 9H 2 (2) 0.3mol, urea 3.0mol are placed in the beaker, add deionized water and dehydrated alcohol at room temperature, make the volume ratio of ethanol and water in the solution be 10:1, the molar concentration of aluminum ion is 0.24mol / L, Stir until the solids are completely dissolved, move the solution into a high-pressure hydrothermal kettle, and immerse it into the pretreated cordierite honeycomb ceramic matrix. The volume ratio of the solution to the ceramic matrix is ​​50:1, and the solution is adjusted with ammonia water (weight concentration: 25%) pH to neutral, then seal the hydrothermal kettle. The hydrothermal kettle was placed in a thermostat and heat...

Embodiment 3

[0084] Take a commercially available cordierite honeycomb ceramic with a pore density of 400cpsi, cut it into a matrix with a size of 1.0cm×1.0cm×2.5cm, and weigh 1.175g, and immerse it in a 30wt% hydrochloric acid solution at 95°C for 1 hour. Wash and dry, and bake at 1200°C for 6h. Weigh aluminum nitrate (Al(NO 3 ) 3 9H 2 (2) 0.5mol, 5.0mol of urea are placed in the beaker, add deionized water and absolute ethanol at room temperature, make the volume ratio of ethanol and water in the solution be 5:1, the molar concentration of aluminum ion is 10mol / L, stir Until the solids are all dissolved, move the solution into a high-pressure hydrothermal kettle and immerse it into the pretreated cordierite honeycomb ceramic substrate. The volume ratio of the solution to the ceramic substrate is 20:1, and the pH is adjusted with ammonia water (weight concentration: 25%) value to neutral, then seal the hydrothermal kettle. The hydrothermal kettle was placed in a thermostat and heated ...

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Abstract

The invention discloses an integral clustered alumina supported catalyst and its application. The carrier includes a hierarchical structure alumina coating and a monolithic porous ceramic matrix; the hierarchical structure alumina coating is a micron-scale cluster of leaves with a thickness of nanometers, forming a flower-like structure.

Description

technical field [0001] The invention relates to the fields of material manufacturing and chemical application, in particular to an integral cluster alumina-supported catalyst and its catalytic application. Background technique [0002] The monolithic structure carrier is a kind of block type catalyst carrier with macroscopic size and regular structure. Fluid channels of a certain size are evenly distributed inside, which has the advantages of small mass transfer resistance, high mass transfer efficiency, and easy assembly and disassembly. The monolithic structure catalyst made by loading catalytically active components has been widely used in the purification treatment of automobile exhaust and industrial exhaust gas, catalytic combustion and other fields. However, monolithic structural supports are mostly high-temperature sintered bodies, such as cordierite honeycomb ceramics, α-Al 2 o 3 Foamed ceramics, etc., have the disadvantage of small specific surface area, which is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J21/16B01J23/30B01J23/28B01J35/10B01D53/86B01D53/94
CPCB01D53/86B01D53/94B01J21/16B01J23/002B01J23/28B01J23/30B01J2523/00B01J35/615B01J2523/69B01J2523/31B01J2523/22B01J2523/41B01J2523/68
Inventor 王昊李平孙钰铭耿赫张衡刘思琴
Owner EAST CHINA UNIV OF SCI & TECH
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