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Method for preparing Ce-Zr based nano rare earth composite oxide

A composite oxide and nano-composite technology, applied in the fields of material chemistry and environmental chemistry, can solve the problems of small fresh specific surface area, weak aging resistance, high production cost, etc., and achieve no waste liquid discharge, low cost and low energy consumption Effect

Inactive Publication Date: 2007-10-24
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above methods often have the disadvantages of using a large amount of water as a solvent or relatively high production costs. At the same time, most of the prepared solid solutions are oxides containing only cerium and zirconium, and no other rare elements are added to optimize the performance of the material. The fresh specific surface area Also small, not strong aging resistance

Method used

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  • Method for preparing Ce-Zr based nano rare earth composite oxide

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The weight ratio of each component in the target product cerium-zirconium-based nano-rare earth composite oxide is: CeO 2 65% ZrO 2 20%, LaO 2 15% according to CeO 2 , ZrO 2 Weigh 161g of low-chloride cerium carbonate and 44g of low-chloride zirconium carbonate required for the reaction, add 22g of oxalic acid therein, and keep grinding and stirring, the dry powder gradually changes from dry white powder to white viscous. Weigh 15g of lanthanum oxide and mix it into the above system, stir well, add 50g of surfactant Triton-100, and stir evenly. After drying at 90°C for 6 hours, the precursor of the target product was obtained. After the precursor is ground, it is transferred into a crucible and placed in a muffle furnace. Calcined at 550°C for 2 hours, took out the crucible, cooled naturally, crushed with a jet mill or ball milled to obtain the desired product. The fresh specific surface area of ​​the measured product is 130m 2 / g, the specific surface area after...

Embodiment 2

[0029] According to the weight ratio of each component of the target product: CeO 2 45%, ZrO 2 50%, YO 2 The proportion of 5% is used for product preparation. Weigh 111g of low-chloride cerium carbonate, weigh 111g of low-chloride zirconium carbonate, add 40g of citric acid to it, and keep grinding and stirring, the dry powder gradually changes from dry white powder to white viscous. Weigh 5g of yttrium oxide, mix it into the above system, stir well, add 24g of polyethylene glycol, and stir evenly. After drying at 90°C for 6 hours, the precursor of the target product was obtained. After the precursor is ground, it is transferred into a crucible and placed in a muffle furnace. Calcined at 450°C for 2 hours, took out the crucible, cooled naturally, and pulverized or ball milled with a jet mill to obtain the desired product. Determination of the fresh specific surface area of ​​the product is 100m 2 / g, the specific surface area after sintering at 900°C for 2h is 45m 2 / g....

Embodiment 3

[0031] According to the weight ratio of each component of the target product: CeO 280% ZrO 2 15% NdO 2 The proportion of 5% is used for product preparation. Weigh 198g of low-chloride cerium carbonate, weigh 33g of low-chloride zirconium carbonate, add 20g of formic acid to it, grind and stir continuously, the dry powder gradually changes from dry white powder to white viscous. Weigh 5 g of yttrium oxide and mix it into the above system, stir well, add 19 g of Tween, and stir evenly. After drying at 90°C for 6 hours, the precursor of the target product was obtained. After the precursor is ground, it is transferred into a crucible and placed in a muffle furnace. Calcined at 650°C for 2 hours, took out the crucible, cooled naturally, and pulverized or ball milled with a jet mill to obtain the desired product. Determination of the fresh specific surface area of ​​the resulting product is 100m 2 / g, the specific surface area after sintering at 900°C for 2h is 55m 2 / g.

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Abstract

The invention discloses a making method of cerium-zirconium based nanometer composite oxide, which comprises the following steps: adopting low-chlorine zirconium carbonate and low-chlorine cerium carbonate as main raw material; adding rare earth element such as lanthanum, promethium, yttrium, neodymium and so on; proceeding solid-solid reaction to prepare; obtaining the solid solution with cubic crystal. The fresh specific area of cerium-zirconium based nanometer composite oxide is 100-150m2 / g with aged specific surface area at 45-60m2 / g after sintering 2h under 900 deg. c, which simplifies the technical course and equipment with low energy consumption.

Description

Technical field: [0001] The invention relates to a preparation method of a cerium-zirconium-based nano rare earth composite oxide solid solution. The rare earth oxide can be used in the catalytic process of various reactions, such as automobile exhaust gas purification treatment, exhaust gas treatment of internal combustion engines, dehydrocyclization of hydrocarbons and other organic substances, etc., and belongs to the field of material chemistry and environmental chemistry. Background technique: [0002] Cerium-zirconium oxide solid solution has high oxygen storage capacity and good thermal stability, and it has attracted wide attention as a catalyst carrier for automobile exhaust purification, and is one of the hotspots in the field of catalyst research. This solid solution is applied to the three-way catalyst for automobile exhaust purification (hereinafter referred to as TWC), mainly because there is a reversible transformation of cerium: Ce3+Ce4+, so that CeO2 is eas...

Claims

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Application Information

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IPC IPC(8): C01G57/00C01G25/02C01F17/00B01J21/06B01J23/10B01J32/00C01G99/00
Inventor 刘金库罗重霄
Owner EAST CHINA UNIV OF SCI & TECH
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