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A preparation method of anti-aging and spherical cerium oxide with large specific surface area

A large specific surface area, cerium oxide technology, applied in chemical instruments and methods, inorganic chemistry, rare earth metal compounds, etc., can solve the problem of catalytic performance degradation and achieve the effect of prolonging the production cycle

Active Publication Date: 2016-01-13
BAOTOU XINYUAN RARE EARCH HI TECH NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In November 2014, the patent CN104148116A disclosed a method for preparing cerium oxide with low cost and large specific surface area. The product prepared by this method has good aging resistance, but the product prepared by this method is not pure cerium oxide, and there are The addition of sulfur element reduces the catalytic performance of the product

Method used

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  • A preparation method of anti-aging and spherical cerium oxide with large specific surface area
  • A preparation method of anti-aging and spherical cerium oxide with large specific surface area
  • A preparation method of anti-aging and spherical cerium oxide with large specific surface area

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Experimental program
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Effect test

Embodiment 1

[0021] Measure 35.8ml triethylenetetramine, ethanol and deionized water respectively and mix evenly, add 35g hexadecyltrimethylammonium bromide to it, stir to make it dissolve, obtain surfactant solution; 1000ml concentration 0.12mol / L (NH 4 ) 4 Ce(NO 3 ) 6 solution and heated to 90°C, added the prepared surfactant solution to it, adjusted the pH of the reaction system to 10 with ammonia water, and aged for 72 hours to obtain a gray precipitate that was easy to filter, and the precipitate was washed with ethanol and deionized Washed twice with water, filtered, and dried at 80°C to obtain a loose yellow powder with a firing temperature of 400°C and a specific surface area of ​​140.1m after holding for 3 hours 2 / g, or the specific surface area after burning at 800°C for 3 hours is 92.23m 2 / g, median particle size D 50 Spherical cerium oxide with aging resistance and large specific surface area of ​​9.85μm.

Embodiment 2

[0023] Measure 50.7ml triethylenetetramine, ethanol and deionized water respectively and mix evenly, add 50g hexadecyltrimethylammonium bromide to it, stir to make it dissolve, obtain surfactant solution; 1000ml of Ce(NO 3 ) 4 solution and heated to 90°C, added the prepared surfactant solution to it, adjusted the pH of the reaction system to 11 with ammonia water, and aged for 72 hours to obtain a gray precipitate that was easy to filter, and the precipitate was washed with ethanol and deionized Washed twice with water, filtered, and dried at 80°C to obtain a loose yellow powder with a firing temperature of 400°C and a specific surface area of ​​176.4m after holding for 3 hours 2 / g, or after burning at 800°C for 3 hours, the specific surface area is 111.8m 2 / g, median particle size D 50 Spherical cerium oxide with a size of 9.08μm, very good fluidity, aging resistance and large specific surface area.

Embodiment 3

[0025] Measure 68.6ml triethylenetetramine, ethanol and deionized water respectively and mix uniformly, add 50.3g hexadecyltrimethylammonium bromide wherein, stir and make it dissolve, obtain surfactant solution; Add 1000ml concentration of 0.23mol / L (NH 4 ) 4 Ce(NO 3 ) 6 solution and heated to 90°C, added the prepared surfactant solution to it, adjusted the pH of the reaction system to 9 with ammonia water, and aged for 24 hours to obtain a gray precipitate that was easy to filter, and the precipitate was washed with ethanol and deionized Washed twice with water, filtered, and dried at 80°C to obtain a loose yellow powder with a firing temperature of 400°C and a specific surface area of ​​142.5m after holding for 3 hours 2 / g, or the specific surface area after burning at 800°C for 3 hours is 77.3m 2 / g, median particle size D 50 Spherical cerium oxide with a size of 11.2μm, very good fluidity, aging resistance and large specific surface area.

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Abstract

The present invention relates to a preparation method of anti-aging and spherical cerium oxide with a large specific surface area, and belongs to a material preparation technology. A Ce4+ solution is added to a reactor to be heated to 90 DEG C, a surfactant solution prepared by triethylenetetramine, alcohol, cetyl trimethyl ammonium bromide and deionized water is added into the heated Ce4+ solution, and then ammonia water is added to adjust the pH of the reaction system to 9 to 11. The system is subjected to aging reaction to obtain a gray precipitate which is extremely easily to be filtered. The filtered precipitate is washed with ethanol and deionized water, the washed precipitate is filtered, the filtered precipitate is dried at 80 DEG C to obtain an incompact yellow powder, and the incompact yellow powder is subjected to thermal insulation at 400 DEG C for 3 h to achieve a specific surface area of 120-180 m<2> / g, or subjected to aging at 800 DEG C for 3 h to achieve a specific surface area of 75-115 m<2> / g. The obtained anti-aging and spherical cerium oxide has a median particle size D50 of 7-15 [mu]m, is very good in powder flowability, and has a large specific surface area.

Description

technical field [0001] The invention relates to a preparation method of aging-resistant spherical cerium oxide with large specific surface area, which belongs to a material preparation process. Background technique [0002] Due to its unique physical and chemical properties, ceria has important applications in the fields of catalysis, polishing, and ultraviolet absorption. In recent years, due to the global emphasis on environmental protection, higher requirements have been put forward for motor vehicle exhaust emissions. The aging-resistant large specific surface area cerium oxide is more and more widely used in the automobile exhaust industry. The catalyst used for automobile exhaust purification can be Effectively reduce the emission of unburned hydrocarbons, carbon monoxide and nitrogen oxides, and the ability of cerium oxide to store nitrogen oxides at low temperature (200°C) and high temperature aging resistance are the key indicators for its application. In order to ...

Claims

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Application Information

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IPC IPC(8): C01F17/00
Inventor 赵永志张瑞祥郝先库贾红梅王士智刘海旺刘莎莎马显东许宗泽
Owner BAOTOU XINYUAN RARE EARCH HI TECH NEW MATERIAL
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