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Rare earth perovskite type oxygen storage material for purifying vehicle tail gas

An oxygen storage material, a technology for automobile exhaust, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as poor low-temperature oxygen storage performance, and achieve excellent Medium and low temperature oxygen storage performance and high temperature thermal stability, simple process, and the effect of widening the operating window

Active Publication Date: 2008-10-01
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another example, the 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. The oxygen release capacity is equivalent, but the low temperature oxygen storage performance is not good

Method used

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  • Rare earth perovskite type oxygen storage material for purifying vehicle tail gas
  • Rare earth perovskite type oxygen storage material for purifying vehicle tail gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] 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 12 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 the furnace to obtain a black powder.

[0013] 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

[0015] 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 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 12 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.

[0016] 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

[0018] 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 6-12 hours, filter, and dry the obtained precipitate in air atmosphere at 110°C for 12 hours, take it out, grind it finely, and calcinate. The calcination process was performed in the same manner as in Example 1 to obtain a black powder.

[0019] 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 perovskite typed oxygen storage material used for the purification of automobile tail gas, belonging to the field of automobile tail gas catalyst technique. The general formula of the oxygen storage material is La1-xAxMn1-yByO3; wherein, A is one of Sr, Y, Ce, Pr or Nd; B is one of Ni, Fe, Cu or Co; x and y are mol values. The oxygen storage material provided by the invention has outstanding middle and low temperature oxygen storage performance and high temperature heat stability, can keep excellent oxygen storage performance after high temperature aging, has the testing performance which is far higher than that of ceria-zirconia oxygen storage material which is widely applied at present, meets the requirements of current automobile tail gas disposal technique on the low temperature performance and practical service life of the oxygen storage material, can replace the ceria-zirconia oxygen storage material to be applied in purification of automobile tail gas so as to widen the operation window of the purification catalyst of the automobile tail gas, and has strong generalized values. The process adopted by the rare earth perovskite typed oxygen storage material is simple, has good repeatability and is easy to realize the industrialization production.

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. technical background [0002] The main harmful components contained in automobile exhaust are carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NO x ). 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 (Operation Window). However, in actual situations, due to road co...

Claims

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Application Information

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IPC IPC(8): B01D53/94B01J23/889
Inventor 翁端冉锐吴晓东樊俊
Owner TSINGHUA UNIV
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