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Automobile tail gas purification catalyst and preparation method thereof

A technology for purifying catalysts and automobile exhaust, which is applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., and can solve problems such as low activity and unsuitability for purifying automobile exhaust. , to achieve the effect of enhancing reducing ability, enhancing Redox ability, and good thermal stability

Active Publication Date: 2017-02-01
JIANGXI YUANYI INDAL DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of catalyst avoids the use of precious metals, but is relatively inactive and not suitable for purifying automobile exhaust

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A catalyst for purifying automobile exhaust gas, the active component is a silver-doped layered perovskite structure, and the chemical formula is LaBa 2 Cu 2 Mn 0.5 Ag 0.5 o 7 , belongs to the orthorhombic crystal system, in which rare earth metal ions coordinate with 8 oxygen ions, alkaline earth metal ions coordinate with 10 oxygen ions, and transition metal ions have two different lattice positions. When doped with Ag + After entering the lattice, it will increase the content of high-priced transition metal ions, enhance the oxidation ability, and form structural defects, promote the activity of lattice oxygen, enhance the ability of Redox, and thus improve the activity of the catalyst.

[0032] The preparation method of the above-mentioned automobile exhaust purification catalyst comprises the following steps:

[0033] 1) Weigh the nitrates of each metal element according to the stoichiometric ratio and dissolve them in water, add citric acid or glycine 0.8 to ...

Embodiment 2

[0039] A catalyst for purifying automobile exhaust gas, the active component is a layered perovskite structure doped with silver, and the chemical formula is La 0.7 Ce 0.3 Sr 2 Co 2 Mn 0.9 Ag 0.1 o 7 , belongs to the orthorhombic crystal system, in which rare earth metal ions coordinate with 8 oxygen ions, alkaline earth metal ions coordinate with 10 oxygen ions, and transition metal ions have two different lattice positions. When doped with Ag + After entering the lattice, it will increase the content of high-priced transition metal ions, enhance the oxidation ability, and form structural defects, promote the activity of lattice oxygen, enhance the ability of Redox, and thus improve the activity of the catalyst.

[0040] The preparation method of the above-mentioned automobile exhaust purification catalyst comprises the following steps:

[0041] 1) Weigh the nitrates of each metal element according to the stoichiometric ratio and dissolve them in water, add citric acid...

Embodiment 3

[0047]A catalyst for purifying automobile exhaust gas, the active component is a silver-doped layered perovskite structure, and the chemical formula is La 0.7 Y 0.3 Ba 1.5 Sr 0.3 co 2 mn 0.95 Ag 0.05 o 7 , belongs to the orthorhombic crystal system, in which rare earth metal ions coordinate with 8 oxygen ions, alkaline earth metal ions coordinate with 10 oxygen ions, and transition metal ions have two different lattice positions. When doped with Ag + After entering the lattice, it will increase the content of high-priced transition metal ions, enhance the oxidation ability, and form structural defects, promote the activity of lattice oxygen, enhance the ability of Redox, and thus improve the activity of the catalyst.

[0048] The preparation method of the above-mentioned automobile exhaust purification catalyst comprises the following steps:

[0049] 1) Weigh the nitrates of each metal element according to the stoichiometric ratio and dissolve them in water, add citric...

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PUM

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Abstract

The invention provides an automobile tail gas purification catalyst which can reduce the noble metal consumption and enhance the catalytic activity. The automobile tail gas purification catalyst is characterized by comprising silver-doped laminar-perovskite-structure ReM2(Cu,Co,Mn)3-deltaAgdeltaO7, wherein Re is a rare-earth element, M is an alkali earth metal element, and 0<=delta<=0.5. The invention also provides a preparation method of the catalyst. The preparation method comprises the following steps: 1) weighing nitrates of metal elements according to the stoichiometric proportion, dissolving in water, and adding citric acid or glycine and ethanediol; 2) carrying out microwave heating and stirring to a gel state; 3) drying by heating, and grinding to obtain a brown precursor; and 4) calcining at 600-800 DEG C in an air atmosphere to form the final catalyst.

Description

[0001] 【Technical field】 [0002] The invention relates to the field of tail gas purification, in particular to an automobile tail gas purification catalyst and a preparation method thereof. [0003] 【Background technique】 [0004] It is imminent to study new catalysts for automobile exhaust gas conversion and control the emission of automobile exhaust pollutants. The research in this field has become a global topic. [0005] At present, the catalysts in this direction are mainly Pt-Ru or Pt-Pd-Ru noble metal three-way catalysts with Pt as the main component. The preparation method mostly adopts multiple impregnation methods. Representative patents such as CN1342520A, CN1385239A, CN1413769A, CN1502410A, CN1511621A, etc. . Although this type of catalyst has high activity, the preparation process is complicated and the cost is high, and it is prone to sintering deactivation under high temperature conditions. There is also a class of rare earth composite oxide catalysts, such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01D53/94
CPCB01D53/9413B01D53/944B01D2258/01B01J23/002B01J23/8892B01J2523/00B01J2523/25B01J2523/24B01J2523/3712B01J2523/3706B01J2523/72B01J2523/36B01J2523/18B01J2523/845
Inventor 唐剑廖根良
Owner JIANGXI YUANYI INDAL DEV
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