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A kind of preparation method of mesoporous structure cerium zirconium aluminum lanthanum base oxygen storage material

A technology of mesoporous structure and oxygen storage material, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve the problems of no comprehensive performance data of oxygen storage capacity and reduction performance, etc., and achieves easy industrial implementation and simple process , easy cleaning effect

Active Publication Date: 2017-02-22
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent 201110204326 discloses a catalyst support material with oxygen storage capacity and its manufacturing method. Patent CN103566923A discloses a cerium-zirconium-aluminum composite oxide oxygen storage material and its preparation method. Surface area, but there is no comprehensive performance data such as oxygen storage capacity and reduction performance

Method used

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  • A kind of preparation method of mesoporous structure cerium zirconium aluminum lanthanum base oxygen storage material
  • A kind of preparation method of mesoporous structure cerium zirconium aluminum lanthanum base oxygen storage material
  • A kind of preparation method of mesoporous structure cerium zirconium aluminum lanthanum base oxygen storage material

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Experimental program
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Embodiment 1

[0041] A preparation method of the mesoporous cerium-zirconium-aluminum-lanthanum-based oxygen storage material of the present invention, the specific operation steps are as follows:

[0042] by CeO 2 :ZrO 2 :La 2 o 3 :Y 2 o 3 :Al 2 o 3 = Weight ratio of 11:7:1:1:19 Weigh the corresponding cerous nitrate, zirconium nitrate, aluminum nitrate, lanthanum nitrate and the nitrate of doping element yttrium, add water to mix and dissolve, and add the same substance as cerous nitrate The amount of hydrogen peroxide, add water and stir and adjust the total concentration of the mixed salt in the solution to be 0.8mol / L, to obtain the mixed salt solution A; ammonium carbonate and ammonia water are formulated as a precipitant in a ratio of 1:1 by substance, and the precipitate dissolved in water and diluted to the total concentration of precipitating agent (as NH 4 + Total) is 1.2mol / L and volume is identical with mixed salt solution A, obtains precipitating agent solution B; Sur...

Embodiment 2

[0046] A preparation method of the mesoporous cerium-zirconium-aluminum-lanthanum-based oxygen storage material of the present invention, the specific operation steps are as follows:

[0047] by CeO 2 :ZrO 2 :La 2 o 3 : Bi 2 o 3 :Al 2 o 3 =10.0:8.6:0.9:0.5:20 by weighing the corresponding nitrates of cerous nitrate, zirconium nitrate, aluminum nitrate, lanthanum nitrate and doped element bismuth, add water to mix and dissolve, and press cerous nitrate and hydrogen peroxide substance The amount ratio is 1:2 to add hydrogen peroxide, add water to stir and adjust the total concentration of mixed salt in the solution to be 0.5mol / L, to obtain mixed salt solution A; take ammonia as precipitant, add water to adjust the concentration of precipitant (with NH 4 + (meter) is 1.0mol / L and volume is identical with mixed salt solution A, obtains precipitant solution B; Surfactant (surfactant is polyacrylamide and polyvinyl alcohol of quaternization, the amount ratio of the two subs...

Embodiment 3

[0051] A preparation method of the mesoporous structure cerium-zirconium-aluminum-lanthanum-based oxygen storage material of the present invention, the specific operation steps are as follows:

[0052] by CeO 2 :ZrO 2 :La 2 o 3 :MnO:Al 2 o 3 The weight ratio of=10.6:8.0:0.7:0.7:20 takes by weighing the aluminum sol that corresponding cerous nitrate, zirconium nitrate, pseudoboehmite make, lanthanum nitrate and the nitrate of doping element manganese, add water and mix and dissolve, And add hydrogen peroxide according to the substance ratio of cerous nitrate and hydrogen peroxide as 1:1, add water to stir and adjust the total concentration of mixed salt in the solution to be 0.6mol / L, to obtain mixed salt solution A; use ammonia as a precipitating agent, add water to adjust Precipitant concentration (as NH 4 +Calculate) is 1.0mol / L and volume is identical with mixed salt solution A volume, obtains precipitant solution B; Surfactant (surfactant is the polyacrylamide of qu...

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Abstract

The invention discloses a preparation method for a cerium-zirconium-aluminum-lanthanum-based oxygen storage material of a mesoporous structure. The preparation method sequentially includes the following steps that a mixed salt solution A containing cerium salt, zirconium salt, aluminum salt, lanthanum salt and doping element salt, a precipitant solution B and a mesporous structure template solution C are prepared; under mechanical or magnetic stirring, the solution A and the solution B are added into the template solution C in a flow-merging mode and aged after reaction, after aging, cleaning is performed, or neutralizing agents are added so that the mixed solution can be neutralized; then filtering or centrifuging is performed, and water and dispersing agents are added into an obtained precipitate so that the precipitate can be stirred to be homogeneous dispersion gel; obtained supernatant is used for dissolving the mixed salt or preparing the template solution C; the gel is infiltrated through absolute ethyl alcohol after being dried through air blowing, then smashed after drying is performed again and roasted inside a muffle furnace to obtain the cerium-zirconium-aluminum-lanthanum-based oxygen storage material of the mesoporous structure. The cerium-zirconium-aluminum-lanthanum-based oxygen storage material prepared through the preparation method is of a thick-pore-wall structure not prone to collapsing at a high temperature and is good in comprehensive performance has a high specific surface area and a large pore volume, and is good in oxygen storage performance and low in reducing peak temperature.

Description

technical field [0001] The invention relates to the technical field of oxygen storage materials, in particular to a method for preparing a mesoporous structure cerium-zirconium-aluminum-lanthanum-based oxygen storage material for high-standard automobile exhaust purification. Background technique [0002] Exhaust emissions brought about by the rapid development of the automobile industry have become one of the most important sources of pollution in cities. For this reason, the country has continuously improved the standards for automobile exhaust emissions. In 2013, my country has fully implemented the National IV exhaust emission standards, and Beijing has implemented the National V exhaust emission standards. Electronically controlled fuel injection (EFI) is used to control the air-fuel ratio (A / F), and a three-way catalytic converter (TWC) is installed to oxidize CO and hydrocarbons in the exhaust gas into CO 2 and H 2 O, will NO x Revert to N 2 , can effectively redu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10B01D53/94B01D53/56B01D53/62
Inventor 王柏春罗科军
Owner CHANGSHA RES INST OF MINING & METALLURGY