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Rare earth composite modified aluminum oxide and preparation method and application thereof

A technology of rare earth compounding and alumina, applied in the preparation of alkali metal aluminate/alumina/hydroxide, chemical instruments and methods, catalyst activation/preparation, etc., can solve specific surface area, pore volume, oxygen storage and release capacity To avoid problems such as decline, achieve excellent thermal stability, easy operation, and improve overall performance

Inactive Publication Date: 2019-10-22
KUNMING METALLURGY INST +2
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] For this reason, the embodiment of the present invention provides a rare earth composite modified alumina, which has excellent stability, specific surface area and pore volume under the condition of higher than 800 ° C, and solves the problems of the existing technology. When the medium alumina material is higher than 800°C, the specific surface area, pore volume, and oxygen storage and release capacity decrease

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  • Rare earth composite modified aluminum oxide and preparation method and application thereof

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Embodiment 1

[0031] The embodiment of the present invention is a preparation method of rare earth composite modified alumina, the preparation method comprising the following steps:

[0032] (a) Add the sodium aluminate solution and the rare earth nitrate solution with a concentration of 150g / L into the dispersant solution to obtain a mixed solution, wherein the volume ratio of the sodium aluminate solution and the rare earth nitrate solution is 1:0.8, and the sodium aluminate The total volume of the solution and the rare earth nitrate solution to the volume ratio of the dispersant solution is 5:1, and the quality of the rare earth nitrate in the rare earth nitrate solution is 50% of the aluminum mass in the sodium aluminate solution, specifically 50% Including 8% lanthanum nitrate, 8% cerium nitrate, 8% zirconium nitrate, 6% thulium nitrate, 8% lutetium nitrate, 6% barium nitrate and 6% dysprosium nitrate, the solvent in the rare earth nitrate solution It is a nitric acid solution with a m...

Embodiment 2

[0036] The embodiment of the present invention is a preparation method of rare earth composite modified alumina, the preparation method comprising the following steps:

[0037] (a) Add the sodium aluminate solution and the rare earth nitrate solution with a concentration of 80g / L into the dispersant solution to obtain a mixed solution, wherein the volume ratio of the sodium aluminate solution and the rare earth nitrate solution is 1:1.2, and the sodium aluminate The total volume of the solution and the rare earth nitrate solution to the volume ratio of the dispersant solution is 7:1, and the quality of the rare earth nitrate in the rare earth nitrate solution is 10% of the aluminum mass in the sodium aluminate solution, specifically 10% Including 1.5% lanthanum nitrate and barium nitrate, 5% dysprosium nitrate, 3.5% thulium nitrate, the solvent in the rare earth nitrate solution is nitric acid solution with a mass fraction of 70%, and the dispersant in the dispersant solution i...

Embodiment 3

[0041] The embodiment of the present invention is a preparation method of rare earth composite modified alumina, the preparation method comprising the following steps:

[0042] (a) Add the sodium aluminate solution and the rare earth nitrate solution with a concentration of 100g / L into the dispersant solution to obtain a mixed solution, wherein the volume ratio of the sodium aluminate solution and the rare earth nitrate solution is 1:1, and the sodium aluminate The total volume of the solution and the rare earth nitrate solution and the volume ratio of the dispersant solution are 6:1, and the quality of the rare earth nitrate in the rare earth nitrate solution is 26% of the aluminum mass in the sodium aluminate solution, specifically 26%. Including 3% lanthanum nitrate and barium nitrate, 10% dysprosium nitrate, 8% zirconium nitrate and thulium nitrate and 5% lutetium nitrate, the solvent in the rare earth nitrate solution is nitric acid solution with a mass fraction of 65%, an...

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Abstract

The embodiments of the invention disclose rare earth composite modified aluminum oxide and a preparation method and an application thereof. The preparation method includes the following steps: (a) co-currently adding a sodium aluminate solution and a rear earth nitrate solution into a dispersing agent solution to obtain a mixed solution; (b) carrying out precipitation treatment on the mixed solution under ultrasonic treatment, and then carrying out aging treatment and filtration to obtain a precipitate; and (c) washing, drying and calcining the precipitate to obtain the rare earth composite modified aluminum oxide material. The preparation method of the invention can uniformly dope rare earth elements into the aluminum oxide and make the prepared rare earth composite modified aluminum oxide have excellent thermal stability, specific surface area and pore volume. In addition, the preparation method of the invention has the advantages of simple process and easy operation.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of alumina modified materials, in particular to a rare earth composite modified alumina and its preparation method and application. Background technique [0002] The main pollutants in automobile exhaust are carbon monoxide (CO), nitrogen oxides (NOx), hydrocarbons (HC) and some particulate pollutants, which are mainly formed due to incomplete combustion of fuel in the engine. Therefore, there are two main ways to purify automobile exhaust. One is to install gasoline injection electronic control system, low-emission combustion system and exhaust gas recirculation system in the engine. The other is to use secondary air outside the engine. Injection technology, particle capture technology and three-way catalytic purification technology and other external purification methods. Among them, the three-way catalytic purification technology is currently the most important purification meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J35/10B01J37/03B01J37/34B01J37/06B01J37/08C01F7/14C01F7/02B01D53/94B01D53/62B01D53/56B01D53/44
CPCB01J23/10B01J37/031B01J37/343B01J37/06B01J37/082C01F7/14C01F7/021B01D53/945C01P2006/12C01P2006/14B01J35/613B01J35/635B01J35/633B01J35/615
Inventor 郝红杰谢刚顾永万和晓才赵加平潘再富冯丰黄卫强袁野郝竞一徐庆鑫施辉献许娜任玖阳和秋谷徐亚飞李永刚
Owner KUNMING METALLURGY INST
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