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Cerium-lanthanum solid solution catalyst for purifying diesel vehicle exhaust particles and preparation method thereof

A technology of tail gas particles and solid solutions, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve problems such as limited oxygen holes, and achieve simple and efficient methods The effect of energy saving and environmental protection

Inactive Publication Date: 2016-07-27
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cerium and zirconium usually exist in the form of tetravalent in cerium-zirconium solid solution, and the amount of oxygen holes introduced is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The cerium-lanthanum mixed rare earth salt is dissolved in water to prepare a solution of [La+Ce]=0.5mol / L. The cerium-lanthanum mixed rare earth salt is a mixture of cerium chloride and lanthanum chloride that have not been separated in the rare earth smelting and separation process. The molar percentage of lanthanum to cerium and lanthanum [La / (Ce+La), mol.%] was 36.2%; an appropriate amount of urea was added to the solution so that the urea concentration in the mixed solution was 2.5 mol / L, and the temperature was 90°C. Stir continuously for 12h under temperature conditions, then suction filter and wash, put the filter cake in an oven to dry at 110℃ overnight, and finally roast it in air at 700℃ for 5h in a muffle furnace to obtain a powder, which is called catalyst A.

Embodiment 2

[0049] Other conditions were unchanged as in Example 1, and the urea concentration was changed to 5 mol / L to prepare catalyst B.

Embodiment 3

[0051] Other conditions were unchanged as in Example 1, and the urea concentration was changed to 10 mol / L to prepare catalyst C.

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PUM

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Abstract

The invention relates to a cerium-lanthanum solid solution catalyst for purifying diesel vehicle exhaust particles and a preparation method thereof, and belongs to the field of environmental protection. The cerium-lanthanum solid solution catalyst comprises cerium and lanthanum elements, wherein cerium and lanthanum exist in a cerium-lanthanum solid solution form with a cerium oxide fluorite cubic structure, and difference between mole percentage between cerium-lanthanum and lanthanum on the surface of the catalyst as well as mole percentage between cerium-lanthanum and lanthanum on the bulk of the catalyst is higher than 5%. Lanthanum can be enriched on the surface of a sample according to specific preparation methods and conditions due to different hydrolysis rates of cerium and lanthanum ions, so that oxygen fluidity of a carrier is increased, oxidation-reduction ability of the catalyst is improved, and catalytic oxidation and decomposition of carbonaceous particles are promoted. The cerium-lanthanum solid solution catalyst can be used as a carrier for carrying precious metals in order to form a load type metal catalyst, so that activity is further improved; the catalyst can be individually coated on porous ceramics or the catalyst can be coated on porous ceramics with precious metals in order to be used as an integral catalyst.

Description

technical field [0001] The invention relates to a diesel vehicle exhaust purification technology, in particular to a catalyst for diesel vehicle exhaust particulate purification, in particular to a diesel vehicle particulate purification catalyst with cerium lanthanum solid solution as the main body and a preparation method thereof, belonging to the field of environmental protection. Background technique [0002] Diesel vehicles use lean burn technology to provide greater power, fuel economy and durability than gasoline vehicles. And oxygen-enriched combustion inhibits the formation of CO and hydrocarbons, reducing the content of pollutants in the exhaust. However, it is worth pointing out that the three-way catalyst, which plays a good role in the purification of gasoline vehicle exhaust gas, cannot remove nitrogen oxides and particulate matter in the exhaust gas of medium diesel vehicles, which is an important factor restricting its wide application. Technology is imminen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01D53/94
Inventor 韩雪郝红蕊郭荣贵
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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