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Layered structure oxygen storage material and preparation method thereof

An oxygen storage material, layered structure technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve problems such as poor thermal stability and decreased oxygen storage capacity, and improve thermal stability. , High oxygen storage capacity, overcome the effect of thermal decomposition

Inactive Publication Date: 2015-07-01
HUBEI HANGTE TECH CO LTD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

But YBaCo 4 o 7 The thermal stability is poor, at 700-800 o Decomposition at C
At YBaCo 4 o 7 In the structure, the Y element can be replaced by Ca and other rare earth elements such as Dy, Ho, Er, Tm, Yb and Lu, and the Co element can be replaced by Fe, Zn, Al, Ga and other elements. When Al or Ga partially replaces Co Can increase YBaCo 4 o 7 Thermal stability, but will make YBaCo 4 o 7 decreased oxygen storage capacity

Method used

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Experimental program
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Embodiment Construction

[0017] Concrete preparation method of the present invention is as follows:

[0018] a. Preparation of salt solution

[0019] According to the oxygen storage material YBa(Co x m 1-x ) 4 o 7 The content of the specific composition components Y, Ba, Co, Ce or Zr metal elements, calculate the quality of yttrium nitrate, barium nitrate, cobalt nitrate, cerium nitrate or zirconium nitrate, weigh the determined amount of yttrium nitrate, barium nitrate, For cobalt nitrate, cerium nitrate or zirconium nitrate, add the nitrates into the same container, add distilled water and stir until the solids are completely dissolved, then prepare a saline solution, the dissolution temperature range is 0~50 o c. The oxygen storage material YBa(Co x m 1-x ) 4 o 7 The range of x in the middle is 0.7~1.0;

[0020] b. Preparation of complexing agent

[0021] Take the calculated amount of ethylenediaminetetraacetic acid or citric acid, and dissolve it in 26-29% ammonia water to prepare a com...

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PUM

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Abstract

A layered structure oxygen storage material and a preparation method thereof. The material is a compound of Y, Ba, Co, Ce or Y, Ba, Co, Zr oxides, and has a general formula of YBa (CoxM1-x) O7, wherein M represents CE or Zr, and x equals to 0.7-1.0. The preparation method is as follows: a, preparation of a salt solution; b, preparation of a complexing agent; c, preparation of a precursor; and d, preparation of YBa(CoxM1-x)4O7. The invention has the advantages that CE or Zr partially substitutes Co in the YBaCo4o7 composite oxides, so as to maintain high oxygen storage capacity, overcome the disadvantage of thermal decomposition at 700-800 DEG C, and greatly improve the thermal stability of oxygen storage materials under high temperature conditions.

Description

technical field [0001] The invention specifically relates to an oxygen storage material for purifying motor vehicle exhaust. Background technique [0002] At present, with the rapid development of China's economy, motor vehicles have also developed rapidly, which has become a powerful driving force for China's economic development, but the requirements for motor vehicle exhaust emissions are also increasing, so the research on catalysts for motor vehicle exhaust purification has also become a current priority. a hot spot. When the air-fuel ratio is lean or rich, the oxygen storage material in the exhaust gas purification catalyst can adjust the ratio of oxidant and reductant in the exhaust gas due to its oxygen storage / release performance, so that CO, CH, NO x At the same time, it has a high conversion rate, so the oxygen storage material becomes the key material in the catalyst for purifying the exhaust gas of motor vehicles. [0003] The traditional oxygen storage ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J37/00
Inventor 童硕
Owner HUBEI HANGTE TECH CO LTD
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