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Composite oxide sosoloid based on cerium oxide and zirconia and method for preparing the same

A composite oxide and zirconia technology, which can be used in ceramic products, other household utensils, applications, etc., can solve the problems of long synthesis time and high preparation cost

Active Publication Date: 2008-06-18
SHANGHAI HUAMING HI TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can obtain a cerium-zirconium solid solution with a higher specific surface area, the preparation cost is higher and the synthesis time is too long

Method used

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  • Composite oxide sosoloid based on cerium oxide and zirconia and method for preparing the same
  • Composite oxide sosoloid based on cerium oxide and zirconia and method for preparing the same
  • Composite oxide sosoloid based on cerium oxide and zirconia and method for preparing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Mix 33ml of cerous chloride solution (the concentration of cerium ion is 1mol / l), 11ml of solution of zirconyl dichloride (the concentration of zirconium ion is 1mol / l) and 15ml of H 2 o 2 Mix to obtain a mixed solution, add 8.1g of formic acid, stir and dissolve, add 80g of high molecular weight monomer methyl methacrylate and 0.8g of initiator azobisisobutyronitrile, stir continuously at room temperature to make the initiator dissolve completely, then add 4g of diisobutyronitrile Pan-80; stir to emulsify.

[0049] The emulsion was placed in a constant temperature water bath at 60°C, and reacted for 8 hours under constant stirring. Then the obtained polymer gel was dried in an oven at 120° C. for 12 hours, and the precursor obtained after drying was baked in a muffle furnace at 500° C. for 2 hours to obtain a fresh oxide.

[0050] Take some fresh oxides and place them in a muffle furnace at 900°C for 6 hours to obtain aged oxides. The specific surface area after agin...

Embodiment 2

[0052] The same method as in Example 1, the difference is that H 2 o 2 The dosage was 30ml, 14g of citric acid was used instead of formic acid, the monomer type was changed to styrene, the surfactant system was changed to Span-85, the polymerization temperature was 80°C, and the polymerization reaction was carried out for 6 hours. The specific surface area of ​​the resulting aged oxide is 38m 2 / g, the oxygen storage capacity is 7.71ml / g.

Embodiment 3

[0054] According to the same method as in Example 1, the difference is that H 2 o 2 The dosage is 22.5ml, 5.5g of acetic acid is used instead of formic acid, the initiator is dibenzoyl peroxide, the polymerization reaction temperature is changed to 80°C, and the polymerization reaction takes 12 hours. Take some fresh oxides and place them in a muffle furnace for 6 hours at 900°C to obtain aged oxides. The aging specific surface area is 34m 2 / g, the oxygen storage capacity is 7.54ml / g.

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Abstract

The invention discloses a composite oxide solid solution based on cerium oxide and zirconium oxide and preparation method, wherein the cerium / zirconium atom ratio is at least 1, the preparation method is as follows: first the cerium-containing rare-earth solution and the zirconium solution are mixed according to the proportion, and then organic acid is added according to chemical measurement for even mixing, and then a polymer monomer and initiator, simultaneously one or several surfactants are added, rapid stirring and emulsifying is performed to form water-in-oil emulsion. The emulsion is placed at a certain temperature and generates reaction for a length of time so as to be polymerized to form the gel, the gel is dried and roasted to obtain rare-earth-zirconium solid solution. The invention is a preparation method different with the prior technique, and has simple process, moreover the prepared composite oxide solid solution has larger specific surface area and higher oxygen storage amount.

Description

technical field [0001] The invention relates to a composite oxide solid solution based on cerium oxide and zirconium oxide and a preparation method thereof, in particular to a composite oxide solid solution based on cerium oxide and zirconium oxide for automobile exhaust gas purification catalysts and other catalytic materials. Background technique [0002] With the increasingly stringent environmental protection regulations worldwide, the catalytic conversion technology used to treat and purify automobile exhaust is becoming more and more important. At present, the treatment measures are divided into internal purification and external purification. The external purification is mainly realized by the automobile exhaust gas purification catalytic device, and the core of the automobile exhaust gas purification catalytic device is the catalyst. A multifunctional catalyst should be understood as meaning that the catalyst can not only oxidize (specifically carbon monoxide and hy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/63C04B38/00
Inventor 马新胜张馥鼎吴秋芳高玮宣绍峰陈刚陈雪梅
Owner SHANGHAI HUAMING HI TECH GRP
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