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Oxynitride catalysis reductant in oxygen-enriched condition and preparation method thereof

A technology of oxynitride and reducing agent, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc.

Inactive Publication Date: 2012-08-08
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Foreign scientists have reported that the use of Cu-ZS M-5 molecular sieves can selectively reduce NO under oxygen-enriched conditions. x , studies have shown that nanoscale noble metal catalysts can activate hydrocarbons at lower temperatures and act as reducing agents to convert NO x reduced to N 2 , but domestic research in this area is still in its infancy, and there are few reports in relevant literature

Method used

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  • Oxynitride catalysis reductant in oxygen-enriched condition and preparation method thereof
  • Oxynitride catalysis reductant in oxygen-enriched condition and preparation method thereof
  • Oxynitride catalysis reductant in oxygen-enriched condition and preparation method thereof

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Embodiment 1

[0042] Zirconium source, cerium source, lanthanum source, and yttrium source are all nitrates of corresponding metals, and the surfactant is polyoxyethylene polyoxypropylene copolymer F127. According to formula ratio (weight ratio):

[0043] 8Zr(NO 3 ) 4 :10Ce(NO 3 ) 3 :2La(NO 3 ) 3 :Y(NO 3 ) 3 :9F127:250H 2 O; hydrothermal crystallization treatment at 110-150°C for 24 hours; synthesize a precursor sample of yttrium / lanthanum doped cerium-zirconium oxide composite with high specific surface area and high dispersion, and disperse in aqueous solution after centrifugation and drying At the same time, a certain proportion of γ-alumina sol was added, mixed and stirred for 5 hours, and then dried by centrifugation. After drying at 100°C for 3 hours, it was calcined in a muffle furnace to remove the organic surfactant to obtain the prepared yttrium / lanthanum-doped aluminum cerium zirconium oxide composite nanomaterial, calcining temperature: 500°C; calcining time 4 Hour. I...

Embodiment 2

[0051] The proportion of the formula in Example 1 is constant, and the calcining temperature is 1000° C.-2 hours, and its XRD diffraction pattern is as follows: figure 2 b; transmission electron microscope photo as Figure 5 . It can be seen that the catalytic promoter of this composite system has good thermal stability, and it still maintains a stable cubic crystal phase after heat treatment at 1000°C. The broadened diffraction peaks indicate that it is still in the nanocrystalline grain size range at this time, and there are no abnormal grains. Growth phenomenon; It can be seen intuitively from the transmission electron microscope that the mesoporous structure is still intact.

Embodiment 3

[0053] The formula ratio of the yttrium / lanthanum doped cerium-zirconium composite oxide in Embodiment 1 is kept unchanged, and it is directly dried after hydrothermal treatment, filtration and washing, and then calcined at 500° C. for 4 hours without adding alumina components. The N of its sample 2 -Adsorption analysis profile such as image 3 As shown in b, it can be seen that the specific surface area of ​​the sample without adding alumina components is significantly lower than that of the sample in Embodiment 1 after being calcined at 500 degrees, and the pore size distribution range becomes wider, indicating that the mesoporous structure becomes relatively It is loose, which also shows that the addition of alumina components plays an important role in stabilizing the mesoporous structure and increasing the specific surface area.

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Abstract

The invention relates to a catalytic reducer for catalytic reduction of oxynitrides under oxygen-enriched conditions, which belongs to the technical field of environmental catalysis materials. The catalytic reducer contains 60wt% to 80wt% of an oxygen-storage material, 0.1wt% to 10wt% of a noble metal, 1wt% to 10wt% of an adsorbent and an auxiliary agent in balance amount. The oxygen-storage material is a ternary mesoporous compound comprising cerium oxide, zirconium oxide and aluminum oxide or titanium oxide or silicon oxide nanocrystals, wherein the content of cerium oxide ranges from 20wt%to 60wt%, the content of zirconium oxide ranges from 20wt% to 60wt%, and the mesopore size ranges from 1nm to 100nm. The catalytic reducer is prepared by the hydrothermal method. The obtained oxynitride catalytic reducer has excellent capability of high-efficiency selective reduction of NOx under oxygen-enriched conditions.

Description

technical field [0001] The invention relates to an oxynitride catalytic reducing agent under oxygen-enriched conditions and a preparation method thereof, belonging to the field of environmental catalytic materials. Background technique [0002] Today's energy (oil) shortage is becoming more and more serious, and the use of lean-burn (lean-burn gasoline) engines (such as diesel engines) can improve fuel efficiency and reduce greenhouse gas CO 2 emissions are receiving more and more attention. But lean-burn engine exhaust is rich in oxygen, and in the case of excess oxygen, traditional "three-way" catalysts cannot reduce NO well x , it is difficult to meet the requirements of increasingly stringent exhaust emission regulations. On the other hand, with the development of social economy, the number of automobiles has increased rapidly, which has caused excessive concentration of automobile exhaust pollution in urban tunnels, and caused serious deterioration of the surrounding ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/63B01D53/94
Inventor 陈航榕施剑林严东生何丹农
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI