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Perovskite type composite oxide catalyst for purifying tail gas of internal combustion engine

A technology of composite oxides and catalysts, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problem of low NO conversion rate and unwillingness to mention the conversion rate and other issues to achieve the effect of good thermal stability

Inactive Publication Date: 2010-06-23
SHANTOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] From the literature reports so far, it can be seen that rare earth perovskite catalysts containing precious metals can purify NO, CO and HC at the same time, and have a three-way catalytic effect. Purification is suspected of being at the expense of the other. Some of the catalysts have high conversion rates for CO and HC but low conversion rates for NO, while other catalysts have high conversion rates for NO but are unwilling to increase the conversion rates for CO and HC. and

Method used

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  • Perovskite type composite oxide catalyst for purifying tail gas of internal combustion engine
  • Perovskite type composite oxide catalyst for purifying tail gas of internal combustion engine
  • Perovskite type composite oxide catalyst for purifying tail gas of internal combustion engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1, La 0.8 Cu 0.2 Ni 0.8 mn 0.2 o 3 Catalyst activity

[0025] La(NO 3 ) 3 ·6H 2 O, Cu(NO 3 ) 2 ·3H 2 O, Ni(NO 3 ) 2 ·6H 2 O and Mn(NO 3 ) 2 4H 2 Dissolve O in water to prepare a mixed solution with a total concentration of metal ions of 0.2mol / L. Take citric acid according to 0.6 times the total number of moles of metal ions and add it to the mixed solution. After stirring and dissolving, add ammonia water dropwise to adjust the pH of the mixed solution. The value is about 8.5, constant temperature is 70°C, electric stirring until it becomes a wet gel, dried at 110°C for 12 hours, cooled, and the formed xerogel is heated to about 350°C on an electric furnace, and the xerogel spontaneously ignites to obtain gray-black ash , grind the ashes into powder, and bake them at 750°C for 2 hours to become La 0.8 Cu 0.2 Ni 0.8 mn 0.2 o 3 composite oxides.

[0026]Catalyst structure confirmation: the composite oxide was subjected to X-ray diffractio...

Embodiment 2

[0030] Example 2, La 0.8 Cu 0.2 NiO 3 Catalyst activity

[0031] La(NO 3 ) 3 ·6H 2 O, Cu(NO 3 ) 2 ·3H 2 O and Ni(NO 3 ) 2 ·6H 2 Dissolve O in water to prepare a mixed solution with a total concentration of metal ions of 0.2mol / L. Take citric acid according to 0.6 times the total number of moles of metal ions and add it to the mixed solution. After stirring and dissolving, add ammonia water dropwise to adjust the pH of the mixed solution. When the value is about 8.5, keep the temperature at 70°C, stir with electric motor until it becomes a wet gel, dry it at 110°C for 12 hours, cool it, and heat the formed xerogel to about 350°C on an electric furnace, and the xerogel spontaneously ignites to get gray-black ash , grind the ashes into powder, and bake them at 750℃2 for 2 hours to become La 0.8 Cu 0.2 NiO 3 composite oxides.

[0032] The composite oxide also forms a perovskite cubic crystal structure, the La element and the Cu element are located at the A site of t...

Embodiment 3

[0036] Example 3, La 0.8 Cu 0.2 Ni 0.8 Fe 0.2 o 3 Catalyst activity

[0037] La(NO 3 ) 3 ·6H 2 O, Cu(NO 3 ) 2 ·3H 2 O, Ni(NO 3 ) 2 ·6H 2 O and Fe(NO 3 ) 3 9H 2 Dissolve O in water to prepare a mixed solution with a total concentration of metal ions of 0.2mol / L. Take citric acid according to 0.6 times the total number of moles of metal ions and add it to the mixed solution. After stirring and dissolving, add ammonia water dropwise to adjust the pH of the mixed solution. The value is about 8.5, electric stirring at a constant temperature of 70°C until it becomes a wet gel, dried at 110°C for 12 hours, cooled, and the formed xerogel is heated to about 350°C on an electric furnace, and the xerogel spontaneously ignites to obtain gray-black ash. Grind the ashes into powder and bake them at 750°C for 2 hours to become La 0.8 Cu 0.2 Ni 0.8 Fe 0.2 o 3 composite oxides.

[0038] The composite oxide also forms a perovskite cubic crystal structure, La and Cu element...

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Abstract

The invention discloses a rare earth perovskite type oxide catalyst and a preparation method thereof. The general formula of the catalyst is La1-xCuxBO3, wherein x is within 0.05 to 0.5, and B is Fe, Co, Ni, Cr and Mn or the combination thereof. Nitrates of elements that La, Cu and B stand for are dissolved into water to form mixed solution, ammonia water is added after citric acid is added and dissolved, the mixed solution is then heated into wet gel, the wet gel is dried into dried gel, the dried gel is heated for spontaneous combustion, and obtained ash powder is roasted into the rare earth perovskite type oxide catalyst. The elements La and Cu in the catalyst are located at the position A of the perovskite type structure, and the elements Fe, Co, Ni, Cr or Mn are located at the position B. The oxide catalyst has ideal purifying effect for NO, CO and HC in tail gas of an internal combustion engine.

Description

technical field [0001] The present invention relates to catalysts, in particular to the conversion of nitrogen oxides (NO), carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gas of internal combustion engines into N 2 and CO 2 three-way catalyst. Background technique [0002] With the development of coal-fired industry (such as coal-fired power generation) and the increase of motor vehicle ownership, the emissions of nitrogen oxides (NO accounting for more than 90%), carbon monoxide (CO) and hydrocarbons (HC) are becoming more and more serious. These three types of gases not only pollute the environment and affect the normal life of human beings, but also directly endanger human health. Therefore, developing a three-way catalyst (Three Way Catalyst) that can effectively eliminate the above three types of harmful gases simultaneously has become one of the research hotspots of many environmental and chemical workers. At present, the three-way catalysts that have bee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J23/755B01D53/94
Inventor 郭锡坤史作辉陈达娜刘洁魏锦锋陈耀文
Owner SHANTOU UNIV
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