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Surface cerium-rich nanometer cerium-zirconium composite oxide as well as preparation and application thereof

A technology of composite oxides and cerium-zirconium oxides, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of cold start catalysis affecting mobile source catalysis Performance Noble metal utilization efficiency, affecting reduction temperature, oxygen storage performance and high temperature aging performance, poor reduction performance and oxygen storage performance, etc., to achieve excellent oxygen storage performance and reduction performance, good anti-aging performance, and complete grains

Active Publication Date: 2019-05-21
SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Changes in the molar ratio of cerium-zirconium composite oxides will affect its reduction temperature, oxygen storage performance and high-temperature aging performance, thereby affecting the cold-start catalytic performance and the utilization efficiency of precious metals in mobile source catalytic applications
The content of cerium is relatively high, and the composite oxide shows better reduction performance and oxygen storage performance, but the anti-aging performance is not good; the content of zirconium is relatively high, the composite has better anti-aging performance, but the reduction performance and oxygen storage performance relatively poor performance

Method used

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  • Surface cerium-rich nanometer cerium-zirconium composite oxide as well as preparation and application thereof
  • Surface cerium-rich nanometer cerium-zirconium composite oxide as well as preparation and application thereof
  • Surface cerium-rich nanometer cerium-zirconium composite oxide as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A composition based on cerium oxide, zirconium oxide, lanthanum oxide, and yttrium oxide is prepared, and the proportions of the composition by weight of oxides are: 52%, 37%, 4%, and 7%. (molar ratio 0.3,0.3,0.0123,0.031)

[0043] 1) In the first beaker, dissolve 182g of cerium ammonium nitrate corresponding to cerium oxide in 500ml of deionized water, add 55g of EDTA, stir for 1h; in the second beaker, add 129.5g of zirconium nitrate corresponding to zirconia, and use 1000mL Dissolve in deionized water and stir for 1 hour; in a third beaker, dissolve 14g of lanthanum nitrate corresponding to lanthanum oxide and 24.5g of yttrium nitrate corresponding to yttrium oxide with 1000mL of deionized water, and stir the solution until clear.

[0044] 2) Mix the solutions in the three beakers, stir until clear, and adjust the pH to 2.0 with ammonia water in a water bath at 40°C. At this time, the solution is clear and no precipitate is formed. The solution was fixed to 7L and i...

Embodiment 2

[0050] Except that the hydrothermal conditions for the first time are different, other conditions are the same as in Example 1. Prepare a composition based on cerium oxide, zirconium oxide, lanthanum oxide, and yttrium oxide. The proportions of the composition by weight of oxides are: 52%, 37%, 4%, and 7%, and the hydrothermal condition of the first step is 220 ℃, 20h. See Table 1.

Embodiment 3

[0052] Except that the hydrothermal conditions for the first time are different, other conditions are the same as in Example 1. The hydrothermal condition of the first step is 180°C for 20h.

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Abstract

The invention provides surface cerium-rich nanometer cerium-zirconium composite oxide as well as preparation and application thereof. The composite oxide is a composite of cerium-zirconium oxide and rare earth elements, wherein the molar ratio of cerium to zirconium to the rare earth elements is (2-4):3:(0.1-0.5). The cerium-zirconium composite oxide provided by the invention realizes the diversity of formulas in a same material. The cerium-zirconium composite oxide is prepared by a two-step process, and a structure rich in the cerium on the outer layer and rich in the zirconium on the inner layer is formed, so that the composite oxide not only has excellent ageing resistance, oxygen storage performance and reduction performance, but also has good catalytic performance.

Description

technical field [0001] The invention belongs to the field of catalytic materials, in particular to a cerium-zirconium composite oxide, its preparation method and application. Background technique [0002] Cerium-zirconium composite oxides are widely used in the field of mobile source catalysis because of their excellent oxygen storage and release properties and good aging properties. In addition to participating in the catalytic reaction, the cerium-zirconium composite oxide also has the function of a carrier, supporting and dispersing the active metal. The change of the formula of cerium-zirconium composite oxide has obvious influence on its physical and chemical properties and application performance. The change of the molar ratio of cerium-zirconium composite oxide will affect its reduction temperature, oxygen storage performance and high-temperature aging performance, thereby affecting the cold-start catalytic performance of mobile source catalytic applications and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J35/10
Inventor 宋锡滨刘洪升焦英训艾辽东潘光军
Owner SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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