Surface-modified perovskite catalyst as well as preparation method and application thereof

A surface modification and perovskite technology, applied in chemical instruments and methods, physical/chemical process catalysts, heterogeneous catalyst chemical elements, etc., can solve problems such as low specific surface area and single surface state of perovskite

Pending Publication Date: 2020-09-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a low-cost raw material, high-stability surface-modified perovskite catalyst, to overcome the shortcoming of the low specific surface area of ​​the traditional perovskite catalyst, to use hydrogen peroxide to treat perovskite Oxidation treatment on the surface of the perovskite largely overcomes the problem of a single surface state of the perovskite

Method used

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  • Surface-modified perovskite catalyst as well as preparation method and application thereof
  • Surface-modified perovskite catalyst as well as preparation method and application thereof
  • Surface-modified perovskite catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. carry out proportioning according to the chemical formula of perovskite catalyst, take by weighing 2.165g lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O), 1.36785g cobalt nitrate (Co(NO 3 ) 3 ·6H 2 O), 0.44g platinum nitrate (Pt(NO 3 ) 2 ) was dissolved in 50mL of distilled water, and magnetically stirred to form a 0.1M solution.

[0031] 2. Add 2.9224g of ethylenediaminetetraacetic acid, which is equimolar to the total metal ions, and 4.2028g of citric acid with a molar ratio of 1:2 to the total metal ions, and keep stirring the above solution until it dissolves.

[0032] 3. Adjust the pH value of the above solution to 6 with ammonia water.

[0033] 4. The solution was kept in a water bath at 80°C for 8 hours to form a wet gel.

[0034] 5. Place the obtained wet gel in an oven to raise the temperature to 120°C at a rate of 5°C / min, keep it warm for 24 hours to form a dry gel, then transfer it to a muffle furnace, and raise the temperature to 400°C at a rate of 10°C / mi...

Embodiment 2

[0036] 1. Get the catalyst 0.15g prepared by Example 1 and place it in a beaker, add 30% H 2 o 2 15mL, then heated at 60°C for 6h to remove the moisture, and then dried at 110°C for 2h to obtain a surface-modified perovskite catalyst.

[0037] 2. Repeat the above steps twice to obtain the final sample.

Embodiment 3

[0039] 1. Get the catalyst 0.15g prepared by Example 1 and place it in a beaker, add 30% H 2 o 2 15mL, then heated at 60°C for 6h to remove the moisture, and then dried at 110°C for 2h to obtain a surface-modified perovskite catalyst.

[0040] 2. Repeat the above steps 4 times to obtain the final sample.

[0041] The catalyst prepared by the present invention is characterized, as attached figure 1 As shown, through the comparison of PDF cards, it was found that the perovskite catalyst was successfully prepared in Example 1, and it was found that after 30wt% H 2 o 2 (Hydrogen peroxide aqueous solution) treatment did not change the structure of the catalyst, and still maintained the perovskite structure. At the same time, it is not difficult to find that the crystallinity of the sample modified by hydrogen peroxide decreases, and the spatial structure of the perovskite gradually transforms from the trigonal crystal system to the cubic crystal system. From the perspective o...

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Abstract

The invention discloses a surface modified perovskite catalyst as well as a preparation method and application thereof, wherein hydrogen peroxide is used for treating the prepared perovskite catalyst,so that the surface modified perovskite catalyst is obtained. The initial perovskite catalyst is prepared through a sol-gel process, wherein the preparation method has the advantages that the operation is simple and convenient and is short in time, and then hydrogen peroxide is directly used for carrying out surface oxidation modification on the initial perovskite catalyst, so that the surface state of the perovskite catalyst is changed, and the surface area and the stability are improved. The catalyst is applied to the field of diesel engine tail gas purification treatment, emission of sootparticles can be effectively reduced, and therefore the purpose of reducing the air pollution degree is achieved.

Description

technical field [0001] The invention relates to the technical field of diesel engine exhaust purification catalysts, and more specifically relates to a preparation method and application of a surface-modified perovskite catalyst for diesel engine exhaust purification, which is applied to the catalytic oxidation of soot particles in diesel engine exhaust. Background technique [0002] At present, with the rise and development of the economy, automobiles have become an indispensable means of transportation in today's society. Among them, diesel engines are widely used because of their excellent performance such as high efficiency, stability, and high air-fuel ratio. However, the resulting harmful gases (such as particulate matter, carbon monoxide, hydrocarbons, nitrogen oxides) have seriously threatened the ecological environment and human health. Therefore, it is quite necessary to effectively reduce exhaust emissions, whether it is a threat to environmental degradation or hu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89F01N3/10
CPCB01J23/894B01J23/002F01N3/106B01J2523/00B01J2523/3706B01J2523/828B01J2523/845Y02A50/2351
Inventor 曾丽蓉龚彩荣崔兰王彩云
Owner TIANJIN UNIV
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