Preparation of homogeneous mischcrystal cerium-zirconium-aluminum coating material by coprecipitation method and technique thereof

A technology of co-precipitation method and process method, applied in the field of automobile exhaust gas purification, can solve the problem of not mentioning oxygen storage performance parameters, etc., and achieve the effects of good high temperature resistance performance, simple production process, and reduction of specific surface area loss

Inactive Publication Date: 2009-05-20
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the patent only provides the specific surface area parameters of the coating material obtained by this preparation method after thermal aging treatment, and does not mention the oxygen storage performance parameters

Method used

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  • Preparation of homogeneous mischcrystal cerium-zirconium-aluminum coating material by coprecipitation method and technique thereof
  • Preparation of homogeneous mischcrystal cerium-zirconium-aluminum coating material by coprecipitation method and technique thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0026] Dissolve 3.86g of cerous nitrate and 1.23g of zirconyl nitrate in 12.7mL of deionized water, the molar ratio Ce:Zr=7:3, the molar concentration is [Ce+Zr]=1mol / L, use 4mol / L under rapid stirring NH 3 ·H 2 O for precipitation, adjust the pH to 10, add 0.1g of polyethylene glycol, stir thoroughly for 30min, let it stand at room temperature for 1h, and age at 70°C for 3h; take 14.72g of aluminum nitrate and dissolve it in 39.23mL of deionized water, and use 4mol under vigorous stirring / L NH 3 ·H 2 O for precipitation, the titration end point is pH 9, add polyethylene glycol 0.1g, fully stir for 30min, let stand at room temperature for 1h, and age at 70°C for 3h; stir and mix the two suspensions thoroughly, and carry out the second step at 70°C Secondary aging, the aging time is 12h. Use vacuum filtration to obtain a precipitate, and use deionized water to wash the precipitate until the filtrate is neutral, then dry the obtained filter cake at 120°C for 12h, pre-calcin...

Embodiment 3

[0028] Put 2#f in a tube-type aging furnace, pass through air containing 10% water vapor and heat-treat at 950°C for 10 hours, and obtain an aging sample of 2#f catalyst after cooling in the furnace, which is marked as 2#a950. Put 2#f in a tube-type aging furnace, pass in air containing 10% water vapor and heat-treat at 1050°C for 10 hours, and obtain an aging sample of 2#f catalyst after cooling in the furnace, which is marked as 2#a1050.

[0029] figure 1 Among them are the fresh coating material 1#f that embodiment 1 obtains, the fresh coating material 2#f that embodiment 2 obtains, the aging coating material 2#a of 950 ℃ hydrothermal treatment 10h in embodiment 3 and 1050 ℃ The X-ray diffraction curve of 10h aged coating material 2#a after hydrothermal treatment can prove the formation of three-phase solid solution of cerium, zirconium and aluminum.

[0030] figure 2 They are the oxygen storage performance curves of the fresh coating material in Example 1, the fresh coa...

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Abstract

The invention relates to preparation of a uniform solid solution Ce-Zr-Al based coating material by a coprecipitation method and a process method thereof. A mixed solution of soluble salts of Ce and Zr is coprecipitated by an alkaline solution, a soluble salt solution of Al is separately precipitated by the alkaline solution, the interaction degree of Ce-Zr and Al is regulated and controlled by controlling the aging time, and suspensions are evenly mixed after the aging and then are dried and baked. The method can obtain a Ce-Zr-Al three-phase solid solution with a uniform cubic phase structure. The method has a simple production technology and lower production energy consumption, and greatly improves performances of the Ce-Zr-Al based coating material such as specific surface area, thermal stability, oxygen storage performance and so on. The method ensures that a catalyst containing the Ce-Zr-Al based coating material becomes an excellent and high-performance three-effect catalyst for the purification of automobile tail gas.

Description

technical field [0001] The present invention relates to automobile exhaust purification technology, in particular to a co-precipitation method for preparing a homogeneous solid solution cerium-zirconium-aluminum coating material and its process method, specifically a new method for preparing a cerium-zirconium-aluminum coating material for high-efficiency catalysts based on the co-precipitation method , this process greatly improves the specific surface area, thermal stability and oxygen storage performance of the cerium-zirconium-aluminum-based coating material. The catalyst containing the cerium-zirconium-aluminum-based coating material becomes an excellent high-performance three-way catalyst for automobile exhaust purification. Background technique [0002] The most effective measure to eliminate pollutants such as carbon monoxide (CO), nitrogen oxides (NOx) and hydrocarbons (HC) in automobile exhaust is to install an off-board three-way catalytic converter for automobile...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J21/06B01J37/02B01D53/94
CPCY02T10/22Y02A50/20Y02T10/12
Inventor 沈美庆翁端温静王军
Owner TIANJIN UNIV
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