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Ce/Zr composite oxide, and preparation method and application thereof

A composite oxide and oxide technology, applied in chemical instruments and methods, separation methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the application defects of cerium zirconium composite oxides, Limit the life of the catalyst, the uneven dispersion of metal elements, etc. in the purification ability of automobile exhaust, so as to achieve the effect of enhancing anti-aging ability, increasing adsorption capacity and long service life

Active Publication Date: 2019-03-29
SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

All three methods have problems such as uneven dispersion of metal elements, easy sintering into blocks, and low specific surface area, which limit the purification ability of automobile exhaust and the life of the catalyst to a certain extent.
However, there are defects in the above three methods, which cannot well solve the actual application defects of the existing cerium-zirconium composite oxides.

Method used

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  • Ce/Zr composite oxide, and preparation method and application thereof
  • Ce/Zr composite oxide, and preparation method and application thereof
  • Ce/Zr composite oxide, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0055] This embodiment provides a cerium-zirconium composite oxide and a preparation method thereof.

[0056] In the cerium-zirconium composite oxide: cerium oxide, zirconium oxide, aluminum oxide, lanthanum oxide, praseodymium oxide and sulfate radical, the specific proportions thereof are: 30%, 30%, 20%, 10%, 5%, 5%.

[0057] The preparation steps are as follows:

[0058] Put 300g of zirconium oxide corresponding to zirconia and 300g of cerium oxide corresponding to cerium ammonium nitrate solution in 2000mL ultrapure water, and raise the temperature of the solution to 90°C, and slowly add 200g of aluminum sulfate corresponding to aluminum oxide into the solution, Stir and age for 2h. The temperature of the solution was lowered to room temperature, and 100 g of lanthanum nitrate corresponding to lanthanum oxide was slowly added to the above solution, and 50 g of nitric acid spectrum aqueous solution corresponding to praseodymium oxide was added to the above solution to fina...

Embodiment 2

[0061] This embodiment provides a cerium-zirconium-titanium composite oxide and a preparation method thereof.

[0062] In the cerium-zirconium-titanium composite oxide: cerium oxide, zirconia, titanium oxide, lanthanum oxide, praseodymium oxide and sulfate radical, the specific proportions are: 30%, 30%, 20%, 10%, 5%, 5% .

[0063] The preparation steps are as follows:

[0064] Put 300g of zirconium oxide corresponding to zirconia and 300g of cerium oxide corresponding to cerium ammonium nitrate solution in 2000mL ultrapure water, and raise the temperature of the solution to 90°C, and slowly add 200g of titanium sulfate corresponding to titanium oxide into the solution, Stir and age for 2h. The temperature of the solution was lowered to room temperature, and 100 g of lanthanum nitrate corresponding to lanthanum oxide was slowly added to the above solution, and 50 g of nitric acid spectrum aqueous solution corresponding to praseodymium oxide was added to the above solution to...

Embodiment 3

[0066] This embodiment provides a cerium-zirconium composite oxide and a preparation method thereof.

[0067] In the cerium-zirconium composite oxide: cerium oxide, zirconium oxide, aluminum oxide, lanthanum oxide, praseodymium oxide and sulfate radical, the specific proportions thereof are: 30%, 40%, 10%, 10%, 5%, 5%.

[0068] The preparation steps are as follows:

[0069] The specific implementation is the same as in Example 1, the zirconium nitrate corresponding to 300g zirconia and the aluminum sulfate corresponding to 200g aluminum oxide are replaced with the corresponding aluminum nitrate corresponding to 400g zirconium oxide and 100g aluminum oxide, other ingredients and operation methods are all the same as Embodiment 1 is consistent.

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Abstract

The invention relates to a Ce / Zr composite oxide, and a preparation method and an application thereof. The Ce / Zr composite oxide includes, by weight, 30-70% of cerium oxide, 20-60% of zirconium oxide,5-50% of a metal oxide having L acidity, 3-5% of oxides of other rare earth elements, and 3-10% of sulfate ion. The preparation method includes: processing corresponding source materials of the Ce / Zrcomposite oxide through a sol method to prepare a sol liquid and performing hydrothermal treatment. The Ce / Zr composite oxide simultaneously has B-L dual-acidity, so that the composite has very highpurification effect on nitrogen-containing compounds and unsaturated hydrocarbon compounds. Meanwhile, the composite oxide has uniform distribution of metal elements, is high in specific surface area,has good anti-aging effect and is long in service life. By introducing the metal oxide having L acidity, large lattice imperfection can be formed, and oxygen storage capacity of the lattices is increased, so that the composite oxide is improved in adsorption capacity on sulfides, so that poisoning of the noble metals is prevented and service life of a composite catalyst is prolonged.

Description

technical field [0001] The invention relates to the technical field of new inorganic non-metallic materials, in particular to a cerium-zirconium composite oxide and its preparation method and application. Background technique [0002] Cerium-zirconium composite oxide is an important part of the three-way catalyst for automobile exhaust gas treatment. This type of cerium-zirconium composite oxide must have good aging resistance and high oxygen storage capacity. The introduction of alkaline earth metal elements, transition metal elements, rare earth metal elements, etc. into the cerium-zirconium composite oxide can greatly improve the aging resistance and specific surface area of ​​the cerium-zirconium composite oxide. At present, the production process of cerium-zirconium composite oxides: co-precipitation method, melting method, hydrothermal method and the combination of the three. All three methods have problems such as uneven dispersion of metal elements, easy sintering ...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01J35/10B01D53/94B01D53/56B01D53/72
CPCB01D53/9413B01D53/944B01J23/10B01J35/61
Inventor 宋锡滨潘光军朱国强焦英训艾辽东
Owner SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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