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Ce-Zr catalyst aiming at oxidation reaction of chlorine-containing volatile organic compound

A technology for volatile organic compounds and oxidation reactions, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, heterogeneous catalyst chemical elements, etc., can solve the problem of high catalyst operating temperature and achieve conversion The effect of low rate reduction, good activity and conversion rate, and good stability

Active Publication Date: 2018-07-20
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that loading noble metals (Au, Pt) on Ce-Zr can improve the activity of the catalyst, and the reaction conversion rate is high, but the working temperature of these catalysts is relatively high (above 300 ° C)

Method used

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  • Ce-Zr catalyst aiming at oxidation reaction of chlorine-containing volatile organic compound
  • Ce-Zr catalyst aiming at oxidation reaction of chlorine-containing volatile organic compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1 prepares catalyst Ru / Ce 2 Zr 1

[0014] (1) 3.47g Ce(NO 3 ) 3 ·6H 2 O and 1.29 g ZrOCl 2 ·8H 2 O(Ce:Zr=2:1) ​​was dissolved in 50mL of ethanol, and after stirring at room temperature for a period of time, ammonia water was added dropwise until a purple suspension was obtained, and the pH of the liquid was adjusted to 9-10;

[0015] (2) Let the suspension stand at room temperature for 4 hours, then transfer it to a reaction kettle lined with polytetrafluoroethylene, and place it at 120°C for 24 hours;

[0016] (3) The resulting product was washed with acetone (50vt%) and centrifuged at 6000rpm, this step was repeated three times, and the collected precipitate was dried at 80°C for 12h;

[0017] (4) Calcinate the dried product in a muffle furnace at 500°C for 4 hours to obtain a ratio of Ce 2 Zr 1 Ce-Zr oxide;

[0018] (5) Immerse Ce-Zr oxide in Ru(NO)(NO 3 ) 3 solution to achieve loading, the solid precipitate was separated by centrifugation and ...

Embodiment 2

[0020] Embodiment 2 Catalyst Ru / Ce 2 Zr 1 Applications

[0021] Pump liquid trichlorethylene into dry clean air, adjust the concentration of trichlorethylene at 1000ppm, as the gas to be treated. pump this gas into figure 1 In the measuring device, take 0.4g Ru / CeZrO x The catalyst mixture is placed in a fixed bed. Determination of catalyst Ru / Ce according to the aforementioned "catalyst activity determination method" 2 Zr 1 activity. The reaction temperature is adjusted within the range of 200-300° C., and the corresponding conversion rate at each temperature is measured with a gas chromatograph. have to figure 2 The curve in figure 2 It can be seen that at all the tested temperatures, the Ru / Ce 2 Zr 1 The catalysts all showed higher catalytic activity than other comparative catalysts, and thus higher conversions were obtained. In particular, a conversion rate of more than 90% can be achieved at 250 degrees, which is significantly higher than the results of the ...

Embodiment 3

[0023] According to the wet synthesis oxide method and loading method in Example 1, Ru / CeO 2 , Ru / Ce 1 Zr 1 , Ru / Ce 1 Zr 2 , Ru / ZrO 2 Catalyst, according to the conversion ratio of reaction under the action of each catalyst under the action of each catalyst according to the same step and consumption measurement in each temperature with application example 1, obtain as figure 2 the curve shown.

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PUM

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Abstract

The invention discloses a Ce-Zr catalyst aiming at oxidation reaction of a chlorine-containing volatile organic compound, and belongs to the field of catalysts. Ru is loaded on Ce-Zr, so that better activity and conversion rate can be maintained at lower temperature. For example, trichloro ethylene is catalyzed through an Ru-doped catalyst at 250 DEG C, so that the conversion rate of 90 percent can be achieved. The catalyst has better stability on degrading chlorobenzene, the conversion rate of the trichloro ethylene at relatively lower temperature such as 250 DEG C can reach 90 percent, and after continuously running for 90 hours at the temperature, the conversion rate is not remarkably reduced, so that the catalyst has favorable stability.

Description

technical field [0001] The invention relates to a Ce-Zr catalyst for the oxidation reaction of chlorine-containing volatile organic compounds, especially a Ru / CeZrO catalyst for the oxidation reaction of chlorine-containing volatile organic compounds x A type catalyst belongs to the field of catalysts. Background technique [0002] In industrial production, chlorine-containing volatile organic compounds (CVOCs), such as dichloromethane, trichloroethylene, 1,2-dichloroethane, chlorinated benzene, etc., are often discharged into the environment as waste gas. This problem involves many industries such as petrochemical, resin, plastic, paint, printing and chemical industry. Due to the toxicity and carcinogenicity of CVOCs themselves, and the aggravation of photochemical smog and the destruction of the ozone layer, they are very harmful to the environment and are characterized as the main air pollutants. Therefore, the removal of CVOCs from industrial exhaust gas has always bee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01D53/86B01D53/72
CPCB01D53/8668B01J23/002B01J23/63B01J2523/00B01J2523/3712B01J2523/48B01J2523/821
Inventor 宋鸽路璐璐王婵宋启军
Owner JIANGNAN UNIV