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A kind of zirconium rare earth oxygen storage material and its preparation method

An oxygen storage material and rare earth technology, which is applied in the field of zirconium-based rare earth oxygen storage materials and their preparation, can solve the problems of low specific surface area, poor thermal stability, and difficulty in forming solid solutions of oxygen storage materials, and achieve high temperature stability and storage Oxygen performance improvement, high temperature stability, fine particle effect

Active Publication Date: 2016-11-09
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inventor found after a lot of research that it is difficult to form a solid solution with rare earth oxides such as hafnium oxide and cerium oxide, and the oxygen storage material composited with hafnium oxide and rare earth oxide has a low specific surface area, poor thermal stability and poor oxygen storage capacity.

Method used

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  • A kind of zirconium rare earth oxygen storage material and its preparation method
  • A kind of zirconium rare earth oxygen storage material and its preparation method
  • A kind of zirconium rare earth oxygen storage material and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Industrial zirconium oxychloride products (38.2% ZrO 2 ) 1000 g was dissolved in 5 liters of deionized water, and a small amount of hydrochloric acid was added, and then the zirconium and hafnium were purified and separated by MIBK (methyl isobutyl ketone) extractant to obtain a zirconium oxychloride stock solution with low hafnium content.

[0048] Zirconium oxychloride obtained after separation and purification of hafnium from zirconium and hafnium is used as the raw material of zirconium, and cerium nitrate is used as the source of cerium, according to Ce 0.5 Zr 0.5 o 2 Chemical formula is carried out batching, obtains 500 milliliters of 1M cerium-zirconium mixed solutions, and joins in the reactor. While stirring, slowly add a certain concentration of ammonia water / ammonium bicarbonate buffer solution (ammonia water / ammonium bicarbonate = 3:1) into the cerium-zirconium solution for precipitation reaction, the pH of the precipitation end point is 9, and the room te...

Embodiment 2

[0050]In the preparation process of atomic-grade hafnium products, zirconium oxychloride is used as zirconium raw material after industrial zirconium oxychloride is separated and purified from zirconium and hafnium, and a certain amount of cerium chloride and lanthanum chloride solution is added, according to Ce 0.4 Zr 0.5 La 0.1 o 2 Chemical formula is carried out batching, obtains 1M cerium zirconium lanthanum mixed solution 500 milliliters, and joins in the reactor. While stirring, slowly add 1.5M NaOH solution to the cerium-zirconium-lanthanum solution for precipitation reaction, the pH of the precipitation end point is 13, stir and age at room temperature 25°C for 1 hour, filter, wash, and dry in ordinary air at 120°C overnight Calcined at 600° C. for 3 hours to obtain a cerium-zirconium composite oxide product with a hafnium oxide content of 80 ppm. The fresh specific surface area of ​​cerium-zirconium composite oxide is 110m 2 / g, the total pore volume is 0.50cm 3 ...

Embodiment 3

[0052] Zirconium oxynitrate obtained after separation and purification of hafnium from another zirconium and hafnium is used as the zirconium raw material, and the rare earth raw materials are cerium nitrate, lanthanum nitrate, and neodymium nitrate, according to Ce 0.2 Zr 0.6 La 0.1 Nd 0.1 o 2 Dosing according to the chemical formula to obtain 500 ml of 1M Ce-Zr-La-Nd mixed solution was added to the reactor, and then a certain amount of polyvinyl alcohol (5 wt% of the oxygen storage material) was added. In the state of stirring, slowly add 2M ammonia solution into the solution of cerium, zirconium, lanthanum, and neodymium for precipitation reaction. The precipitation temperature is 50°C, and the pH of the precipitation end point is 10. Stir and age at 50°C for 1 hour, and then directly spray dry at 250°C. Calcined at 600° C. for 3 hours to obtain a cerium-zirconium composite oxide product with a hafnium oxide content of 480 ppm. The fresh specific surface area of ​​ceriu...

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Abstract

The invention discloses a zirconium-class rare earth oxygen storage material and a preparation method thereof, the zirconium-class rare earth oxygen storage material is a composite oxide containing a rare earth element, or containing the rare earth element and a transition metal element or an alkaline earth metal element, wherein the content of hafnium and hafnium oxide is smaller than 500ppm, and the rare earth element is one or more from Ce, Pr, Tb, La, Y, Sm, Sc, Gd and Nd. The zirconium-class rare earth oxygen storage material is prepared from a zirconium compound, obtained by separation and purification of zirconium and hafnium, by the following steps: after the zirconium compound with the hafnium removed is dissolved in water, adding the rare earth, or a rare earth and transition metal or alkaline earth metal water solution according to the ratio of the metal elements, mixing evenly; then performing alkali precipitation, aging, filtration, washing, drying and calcination at 400-1000 DEG C. The zirconium-class rare earth oxygen storage material as an excellent catalyst carrier or auxiliary material can be used for the catalytic purification of vehicle exhaust gas and industrial waste gas treatment and the like.

Description

technical field [0001] The invention relates to a zirconium-based rare-earth oxygen storage material and a preparation method thereof. The zirconium-based rare-earth oxygen storage material is used as an excellent catalyst carrier or auxiliary material, and is applied to the purification treatment of motor vehicle tail gas and industrial waste gas. Background technique [0002] Motor vehicle exhaust has become the main source of urban air pollution. Rare earth oxides are widely used in automobile exhaust purification catalysts, but at high temperatures, the specific surface of rare earth oxides such as cerium oxide will drop sharply, thereby affecting the performance of the catalyst. The addition of zirconia and other stabilizers will increase the high-temperature stability of rare earth oxide materials, and their redox performance will be improved. Therefore, in the catalytic purification catalyst of automobile exhaust, zirconium-based rare earth oxygen storage materials su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10B01J32/00B01D53/94B01D53/86
Inventor 崔梅生张娜龙志奇崔大立
Owner GRIREM ADVANCED MATERIALS CO LTD
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