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Cerium-based solid solution catalyst and preparation method

A solid solution and catalyst technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, combustion methods, etc., can solve problems such as poor thermal stability, achieve the effect of increasing service life and expanding the scope of application

Active Publication Date: 2012-07-04
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the shortcomings of poor thermal stability of existing cerium-based solid solution catalysts, to provide a step-by-step construction of oxide precursors for catalyst activity (with high activity) and structural (with high stability) units, and then use ethanol supercritical The drying method builds a regularly arranged crystal structure, so that the cerium-based solid solution catalyst has both high activity and high thermal stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] According to the Ce / Cu / Mn / Co molar ratio of 1.0 / 0.2 / 0.4 / 0.1, take Ce, Cu, Mn, Co nitrates, dissolve them in deionized water, and prepare an aqueous solution with a total concentration of metal ions of 1.0mol / L . Take 20ml of Ce, Cu, Mn, Co ion solution, stir and add 1.0mol / L sodium hydroxide solution dropwise to make pH = 10, stop the dropwise addition, filter to obtain hydroxide, wash twice with deionized water, and The resulting hydrogel was dried at constant temperature at 80° C. for 5 h to obtain a Ce-Cu-Mn-Co hydroxide solid.

[0024] According to the Ce / Zr / La / Y molar ratio of 1.0 / 2.0 / 0.5 / 0.5, take the nitrates of Ce, Zr, La, and Y, dissolve them in deionized water, and make an aqueous solution with a total concentration of metal ions of 1.0mol / L , take Ce, Zr, La, Y ion solution 20ml, then add above-mentioned Ce-Cu-Mn-Co hydroxide solid in the solution, stir and add dropwise the sodium hydroxide solution of 1.0mol / L, make solution pH=10 , stop dripping, filter t...

Embodiment 2

[0028] The catalyst preparation process is the same as in Example 1, except that the molar ratio of Ce / Cu / Mn / Co in the active unit is 1.0 / 0.1 / 0.2 / 0.5, and the molar ratio of Ce / Zr / La / Y in the structural unit is 1.0 / 1.0 / 0.5 / 2.0.

[0029] Catalyst activity is measured on a fixed bed reactor, the catalyst is loaded with 0.5g, the particles are 30-40 mesh, the organic waste gas is toluene, and the concentration is 10000mg / m 3 , the reaction space velocity is 20,000 h -1 . Other conditions are the same as in Example 1. The result shows that the catalyst toluene complete combustion temperature (T 95 ) is 250 ℃, the catalyst toluene complete combustion temperature of 700 ℃ calcined (T 95 ) is 250 ℃, the catalyst toluene complete combustion temperature of 800 ℃ calcined (T 95 ) is 270 ° C; 900 ° C roasting catalyst toluene complete combustion temperature (T 95 ) is 315°C.

Embodiment 3

[0031] The catalyst preparation process is the same as in Example 1, except that the molar ratio of Ce / Cu / Mn / Co in the active unit is 1 / 0.5 / 0.2 / 0.1, and the molar ratio of Ce / Zr / La / Y in the structural unit is 1 / 4.0 / 0.5 / 2.0.

[0032] Catalyst activity is measured on a fixed bed reactor, the catalyst is loaded with 0.5g, the particles are 30-40 mesh, the organic waste gas is toluene, and the concentration is 10000mg / m 3 , the reaction space velocity is 20,000 h -1 . Other conditions are the same as in Example 1. The result shows that the catalyst toluene complete combustion temperature (T 95 ) is 260 ℃, the catalyst toluene complete combustion temperature of 700 ℃ calcined (T 95 ) is 280 ℃, the catalyst toluene complete combustion temperature of 800 ℃ roasting (T 95 ) is 280°C; the catalyst toluene complete combustion temperature (T 95 ) is 300°C.

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Abstract

The invention discloses a preparation method of a cerium-based solid solution catalyst with high heat stability. The preparation method comprises the steps of: respectively preparing an active unit composite hydroxide composed of Ce, Cu, Mn and Co as well as a structural unit composite hydroxide composed of Ce, Zr, La and Y through the fractional precipitation technology, and constructing a regular crystal structure formed by two composite oxides by adopting the supercritical ethanol drying technology. According to the invention, the prepared cerium-based solid solution catalyst has high activity and high heat stability and can resist 800-900 DEG C high-temperature impact; the service life of the catalyst is significantly increased; and the application range of the cerium-based solid solution catalyst in catalytic oxidation field is expanded.

Description

(1) Technical field [0001] The invention belongs to the field of environmental catalysis, and relates to a preparation method of a cerium-based solid solution oxide catalyst with high thermal stability and its application in VOCs catalytic combustion. (2) Background technology [0002] Recent studies have found that in CeO 2 Doping rare earth and transition metal ions to form a cerium-based solid solution structure (such as Mn-Ce, Co-Ce, Cu-Ce, Cu-Mn-Ce, Cu-Zr-Ce, etc.), can greatly improve the CeO 2 Oxidation-reduction ability, in the catalytic combustion of oxygen-containing, chlorine-containing organic waste gas and soot reaction, it shows the same excellent catalytic performance as noble metals, and is currently the most promising oxide catalytic material to replace noble metals. [0003] However, the catalytic combustion of organic waste gas and soot is a strong exothermic reaction. The instantaneous temperature rise generated by the combustion of organic matter and so...

Claims

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Application Information

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IPC IPC(8): B01J23/889F23G7/07
Inventor 卢晗锋周瑛陈银飞黄海凤
Owner ZHEJIANG UNIV OF TECH
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