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Rare earth pervoskite type oxygen-storage material used for automobile emission purification

An oxygen storage material, technology for automobile exhaust, applied in metal/metal oxide/metal hydroxide catalysts, inorganic chemistry, nickel compounds, etc., can solve problems such as poor low-temperature oxygen storage performance, and achieve excellent medium-low temperature oxygen storage The effect of performance and high temperature thermal stability, easy industrial production, and strong promotion value

Inactive Publication Date: 2017-01-11
桐城市宇洁机动车尾气检测有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As another example, A-site doped LaMnO without noble metal 3 and LaCoO 3 Perovskite-type materials (Appliedcatalysis B: Environment, 2005, 58, 273-288.) have the best oxygen storage performance at 480°C and can reach above 450μmol / g cat., which is basically the same as the current commercial cerium-based oxygen storage materials. Oxygen release capacity is equivalent, but low temperature oxygen storage performance is not good

Method used

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  • Rare earth pervoskite type oxygen-storage material used for automobile emission purification
  • Rare earth pervoskite type oxygen-storage material used for automobile emission purification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Lanthanum nitrate [La(NO 3 ) 3 ·6H 2 O] 6.93g, manganese nitrate [50wt%Mn(NO 3 ) 2 Solution] 5.73g was placed in 40ml deionized water, stirred and dissolved, and 6.72g citric acid was added under room temperature and stirring conditions, and after dissolving, 0.67g ethylene glycol was added dropwise. After the dropwise addition, heated and stirred at 80°C until Evaporation of water produces viscous colloid. Dry the obtained colloid in air atmosphere at 110°C for 10 hours, take it out and pulverize it, pre-calcine at 300°C for 1 hour, calcinate at 800°C for 3 hours, and cool in a furnace to obtain a black powder.

[0014] identified by X-ray diffraction (XRD) analysis (e.g. figure 1 Shown), the powder is made of LaMnO 3 A single crystal composed of a perovskite-structured composite oxide.

Embodiment 2

[0016] Lanthanum acetate [La(CH 3 COO) 3 2H 2 O] 5.63g, manganese acetate [Mn(CH 3 COO) 2 ] 2.49g, nickel acetate [Ni(CH 3 COO) 2 ·H 2 O] 0.31g was placed in 40mL deionized water, stirred until it was fully dissolved, then heated and stirred at 80°C to make it fully hydrolyzed until the water evaporated to produce a viscous colloid. Dry the obtained colloid at 110°C for 10 hours in an air atmosphere, take it out, grind it finely, and calcinate it. The calcination process was performed in the same manner as in Example 1 to obtain a black powder.

[0017] Identified by X-ray diffraction analysis results (such as figure 1 Shown), the powder is made of LaMn 0.9 Ni 0.1 o 3 A single crystal composed of a perovskite-structured composite oxide.

Embodiment 3

[0019] Lanthanum chloride [LaCl 3 ·7H 2 O]4.16g, strontium nitrate [Sr(NO 3 ) 2 ] 1.02g, manganese acetate [Mn(CH 3 COO) 2 ] 2.49g, nickel nitrate [Ni(NO 3 ) 2 ·5H 2O] 0.44g is placed in 40mL deionized water, after stirring and dissolving, the mixed solution is slowly dropped into excess ammonia solution (pH=9~11), and at the same time, the ammonia solution is stirred rapidly to make the precipitation sufficient and uniform, and it is allowed to stand after dropping After 8-10 hours, filter, and dry the obtained precipitate at 110°C for 10 hours in an air atmosphere, take it out, grind it finely, and calcinate it. The calcination process was performed in the same manner as in Example 1 to obtain a black powder.

[0020] Identified by X-ray diffraction analysis results (such as figure 1 Shown), the powder is made of La 0.7 Sr 0.3 mn 0.9 Ni 0.1 o 3 A single crystal composed of a perovskite-structured composite oxide.

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Abstract

The invention discloses a rare earth pervoskite type oxygen-storage material used for automobile emission purification and belongs to the technical field of automobile emission catalyzing. The general formula of the oxygen-storage material is La1-xAxMn1-yByO3, wherein A is one of Sr, Y, Ce, Pr and Nd, B is one of Ni, Fe, Cu and Co, and x and y are mole values. The oxygen-storage material has excellent medium and low temperature oxygen-storage performance and high-temperature thermal stability, still can keep good oxygen-storage performance after being aged at high temperature, has better testing performance than a cerium-zirconium oxygen-storage material widely applied in the prior art, can meet the requirements for low-temperature performance and practical service life of an automobile emission treatment technology in the prior art, can replace the cerium-zirconium oxygen-storage material to be used for automobile emission purification to widen an operation window of an automobile emission purification catalyst and has high popularization value. A technology for preparing the rare earth pervoskite type oxygen-storage material is simple, repeatability is good, and industrial production is easy to achieve.

Description

technical field [0001] The invention belongs to the technical field of automobile exhaust catalysis, and in particular relates to a rare earth perovskite type oxygen storage material used for automobile exhaust purification. [0002] technical background [0003] The main harmful components contained in automobile exhaust are carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NOx). With the increasingly stringent regulations on vehicle exhaust emissions, three-way catalysts (TWCs) that can simultaneously remove the above three types of pollutants have been widely used in vehicle exhaust pollution control. Since there are both oxidation and reduction reactions in the three-way catalysis, only when the ratio of oxides and reductions is within a certain range, can the mutual reaction achieve the purpose of simultaneous elimination. This specific atmosphere range is usually called the operating window of TWC (OperationWindow). However, in actual situations, due to roa...

Claims

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Application Information

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IPC IPC(8): C01G45/12C01G53/00B01D53/94B01J23/889
CPCC01G45/1214B01D53/94B01J23/8892C01G53/70
Inventor 胡雪林
Owner 桐城市宇洁机动车尾气检测有限公司
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