Carbon monoxide room-temperature catalytic oxidation catalyst and preparation method thereof

A technology for catalytic oxidation and carbon monoxide, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as difficult to reach 100%, poor elimination ability, etc., and achieve high catalytic oxidation efficiency and good stability The effect of sex and simple process

Inactive Publication Date: 2013-04-03
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been reported that palladium chloride-copper chloride catalyst is very poor to trace (less than 100ppm) carbon monoxide elimination ability, and carbon monoxide elimination is

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Mix 64g of cerium ammonium nitrate and 200g of urea, heat the solution to 90°C, react for 4-5h, filter and wash, and roast at 400°C for 4-5h;

[0023] (2) Accurately weigh 0.076g of palladium chloride powder and 0.107g of copper chloride, and dissolve them in 5mL of 25% ammonia solution;

[0024] (3) Immerse 2g of the cerium oxide carrier into the prepared palladium chloride solution, mix the carrier with the impregnating solution, fully mix evenly under the action of electromagnetic stirring, immerse at room temperature for 24 hours and let it cool naturally at 25-35°C. drying;

[0025] (4) Calcining the prepared powder at 300° C. for 4 hours to obtain the required palladium chloride-copper chloride / cerium oxide catalyst.

[0026] Catalyst evaluation method: The catalytic oxidation reaction of carbon monoxide at room temperature was evaluated in an atmospheric fixed-bed microreactor (8 mm inner diameter). The raw gas composition used is: CO: 50ppm, the rest is ai...

Embodiment 2

[0029] (1) Mix 32g of cerium ammonium nitrate and 200g of urea, heat the solution to 90°C, react for 4-5h, filter and wash, and roast at 400°C for 4-5h;

[0030] (2) Accurately weigh 0.076g of palladium chloride powder and 0.107g of copper chloride, and dissolve them in 5mL of 25% ammonia solution;

[0031] (3) Immerse 2g of the cerium oxide carrier into the prepared palladium chloride solution, mix the carrier with the impregnating solution, fully mix evenly under the action of electromagnetic stirring, impregnate at room temperature for 24 hours and let it cool naturally at 25-35°C. drying;

[0032] (4) Calcining the prepared powder at 300° C. for 4 hours to obtain the required palladium chloride-copper chloride / cerium oxide catalyst.

[0033] Catalyst evaluation method: The catalytic oxidation reaction of carbon monoxide at room temperature was evaluated in an atmospheric fixed-bed microreactor (8mm inner diameter). The raw gas composition used is: CO: 50ppm, the rest is ...

Embodiment 3

[0036] (1) Accurately weigh 0.076g of palladium chloride powder and 0.107g of copper chloride, and dissolve them in 5mL of 25% ammonia solution;

[0037] (2) Immerse 2g of titanium oxide carrier into the prepared palladium chloride solution, mix the carrier and impregnating solution, fully mix evenly under the action of electromagnetic stirring, impregnate at room temperature for 24 hours, and naturally drying;

[0038] (3) Calcinate the prepared powder at 300°C for 4 hours to obtain the required catalyst.

[0039]Catalyst evaluation method: The catalytic oxidation reaction of carbon monoxide at room temperature was evaluated in an atmospheric fixed-bed microreactor (8 mm inner diameter). The raw gas composition used is: CO: 50ppm, the rest is air, the space velocity is 30000mL / (gh), and the catalyst mass is 0.4g. The feed gas passes directly through the catalyst bed. Use Fuli 7970III gas chromatograph to analyze product composition, carbon molecular sieve column separation...

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Abstract

The invention provides a carbon monoxide room-temperature catalytic oxidation catalyst and a preparation method thereof. The catalyst comprises the following components in percentage by mass: 2-3% of palladium chloride, 2-3% of copper chloride and the balance of carrier, wherein the carrier is cerium oxide or titanium oxide. The catalyst is prepared through an impregnation method. The preparation method comprises the following steps: dissolving the palladium chloride and the copper chloride in excessive ammonia water, wherein the mass concentration of the palladium chloride is 0.015-0.030 g/mL, the mass concentration of the copper chloride is 0.2-0.4 g/mL, the concentration of the ammonia water solution is 20-25%, and the volume of the ammonia water solution is 5 mL; enabling the carrier to carry the palladium chloride and copper chloride solution through the impregnation method, wherein the mass percent of the copper chloride is 2-3%, and the mass percent of the palladium chloride is 2-3%; and naturally drying the prepared catalyst at 25-35 DEG C, and then roasting at 300 DEG C for 4 hours. Through the interaction between the active components and the carrier, the room-temperature catalytic oxidation of carbon monoxide can be realized, and favorable stability can be achieved. The method has the characteristics of simple preparation process, high catalytic oxidation efficiency and the like.

Description

technical field [0001] The present invention relates to a carbon monoxide catalyst and its preparation method, in particular to a carbon monoxide catalytic oxidation catalyst at room temperature and its preparation method. sensors etc. Background technique [0002] The development of catalytic oxidation catalysts for carbon monoxide at room temperature has strong practical application value in environmental protection, fuel cells and elimination of low-concentration carbon monoxide emitted by motor vehicles in semi-enclosed spaces. It has huge market value while effectively improving air quality, and can be directly applied to actual places such as urban underground tunnels and parking lots. Therefore, it is not only of great academic value but also of great application value to explore highly efficient nano-catalytic materials for the catalytic oxidation of carbon monoxide at room temperature. [0003] Represented by Hopcalite catalysts with CuO-MnOx composite oxide as th...

Claims

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Application Information

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IPC IPC(8): B01J27/13B01J37/02B01D53/86B01D53/94B01D53/62
CPCY02A50/20
Inventor 王发根徐艳刘爽张豪杰何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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