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Preparation method for hierarchical pore perovskite catalyst

A perovskite and catalyst technology, which is applied in the field of preparation of multi-level porous perovskite catalysts, can solve the problems of catalytic activity limitation, reducing the contact area of ​​reaction gas and catalyst active sites, etc., so as to reduce industrial waste gas and shorten the circulation and diffusion path , Improve the effect of mass transfer ability

Active Publication Date: 2017-11-24
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently, ABOs 3 Catalysts are generally prepared by high-temperature calcination, forming agglomerated blocks, reducing the contact area between the reaction gas and the active sites of the catalyst, so the catalytic activity is limited

Method used

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  • Preparation method for hierarchical pore perovskite catalyst
  • Preparation method for hierarchical pore perovskite catalyst
  • Preparation method for hierarchical pore perovskite catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Weigh lanthanum nitrate and cobalt nitrate at a molar ratio of 1:1, and weigh La(NO 3 ) 3 •6H 2 O 8.99g, Co(NO 3 ) 2 •6H 2 05.97g and complexing agent citric acid 10.31g, described citric acid molar number is 1.2 times of the sum of lanthanum nitrate and cobalt nitrate molar number;

[0031] (2) Add the mixture of lanthanum nitrate and cobalt nitrate and complexing agent weighed in step (1) into deionized water in sequence. After adding the deionized water, the total concentration of metal ions in the metal nitrate mixture is 0.1mol / L, That is, the total concentration of lanthanum nitrate and cobalt nitrate is 0.1mol / L, stir at room temperature for 0.5h, and mix the ingredients evenly;

[0032] (3) Heat and stir the product obtained in step (2) at 80°C, the water evaporates continuously, gradually forming a sol, and continue stirring until the color of the colloid becomes darker, until a wet gel is formed;

[0033] (4) The wet gel obtained in step (3) was left...

Embodiment 2

[0040] (1) Weigh lanthanum nitrate, strontium nitrate and cobalt nitrate at a molar ratio of 0.9:0.1:1, and weigh La(NO 3 ) 3 •6H 2 O 8.26g, Sr(NO 3 ) 2 0.44g and Co(NO 3 ) 2 •6H 2 O 6.10g and complexing agent EDTA18.31g, described complexing agent is ethylenediaminetetraacetic acid EDTA, and described ethylenediaminetetraacetic acid EDTA molar number is 1.5 times of the sum of lanthanum nitrate and cobalt nitrate molar number.

[0041] (2) Add the mixture of lanthanum nitrate, strontium nitrate and cobalt nitrate and complexing agent weighed in step (1) into deionized water in sequence, and then adjust the pH of the solution to 2~5. After adding deionized water, the metal nitrate mixture The total concentration of metal ions in the medium is 10mol / L, that is, the total concentration of lanthanum nitrate, strontium nitrate and cobalt nitrate is 10mol / L, and stirred at room temperature for 2h;

[0042] (3) Heat and stir the product obtained in step (2) at 60°C, the wate...

Embodiment 3

[0050] (1) Weigh lanthanum nitrate, cerium nitrate and cobalt nitrate at a molar ratio of 0.9:0.1:1, and weigh La(NO 3 ) 3 •6H 2 O 8.26g, Sr(NO 3 ) 2 0.44g and Co(NO 3 )2•6H 2 O 6.10g and complexing agent citric acid 8.58 g, described citric acid molar number is 1 times of the sum of lanthanum nitrate and cobalt nitrate molar number;

[0051] (2) Add the mixture of lanthanum nitrate, cerium nitrate and cobalt nitrate and complexing agent weighed in step (1) into deionized water in sequence. After adding the deionized water, the total concentration of metal ions in the metal nitrate mixture is 2mol / L, stirred at room temperature for 4h;

[0052] (3) Heat and stir the product obtained in step (2) at 90°C, the water evaporates continuously, gradually forming a sol, and continue stirring until the color of the colloid becomes darker, until a wet gel is formed;

[0053] (4) Let the wet gel obtained in step (3) stand for 48 hours to age, dry at 80°C, and grind to 200 mesh; ...

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Abstract

The invention relates to a preparation method for a hierarchical pore perovskite catalyst. The method comprises the following steps: 1) weighting metal nitrate mixture and complexing agent and mixing, wherein the mole number of the complexing agent is 1-2 times of the sum of the mole number of all the nitrate in the metal nitrate mixture; 2) adding the metal nitrate mixture and the complexing agent into deionized water and stirring under room temperature; 3) heating and stirring the acquired product at 60 DEG C-90 DEG C till forming a wet gel; 4) leaving the wet gel in a standby state, ageing, drying and grinding; 5) sintering for 5h at 800 DEG C; 6) reacting for 2-36h in a reaction kettle at 150-200 DEG C; 7) naturally cooling, filtering and drying; 8) sintering for 1-12h at 600 DEG C. The prepared catalyst has the advantages of excellent absorption property and large specific surface area.

Description

technical field [0001] The invention relates to a method for preparing a catalyst, in particular to a method for preparing a multi-level porous perovskite catalyst. Background technique [0002] With the rapid acceleration of my country's economic growth and industrialization, ambient air pollution has gradually intensified, especially smog and the greenhouse effect have caused great harm to the social environment and economic environment. Volatile organic compounds (VOCs) not only make people feel uncomfortable symptoms such as headaches and nausea, but also have the risk of teratogenicity and cancer, and are even closely related to the generation of smog. Methane is contained in natural gas vehicle (CNG) vehicle exhaust, coal bed methane, gas mine and industrial waste gas. Methane is a typical greenhouse gas, and its greenhouse effect is about CO 2 However, methane is a very stable hydrocarbon, which is difficult to be oxidized or activated. Its thermal combustion needs t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J23/34B01J35/10B01D53/86B01D53/72
CPCB01D53/72B01D53/86B01D53/8668B01J23/002B01J23/34B01J23/83B01D2257/7025B01D2257/708B01D2258/01B01D2258/02B01J35/613B01J35/647Y02C20/20
Inventor 段二红王曼王赛飞钱恒力刘旭东牛建瑞
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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