Manganese oxide loaded noble metal monatomic formaldehyde oxidation catalyst as well as preparation method and application thereof

A technology for oxidizing catalysts and precious metals, which is applied in the field of noble metal single-atom formaldehyde oxidation catalysts, can solve the problems of high price, scarce precious metal reserves, and the impact on the cost of catalyst raw materials, so as to improve the reaction activity, the preparation method is stable and reliable, and it is beneficial to scale-up preparation and The effect of industrial application

Inactive Publication Date: 2021-01-01
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, precious metals are scarce and expensive, and their usage seriously affects the raw material cost of catalysts.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016]Take 10g of manganese oxide carrier, the specific surface area of ​​manganese oxide carrier is 100m2 / g, the pore volume is 0.1cm3 / g, manganese is +4. Prepare a platinum nitrate solution with a platinum concentration of 0.1 g / ml, prepare a gold nitrate solution with a gold concentration of 0.05 g / ml, take 1 ml of platinum nitrate solution, 1 ml of gold nitrate solution, and add 23 ml of deionized water for a total of 25 ml. Add 10g of manganese oxide carrier to the solution, immerse it for 6h under stirring, dry at 100℃ for 12h after immersion, wash 5 times with 15ml of deionized water after drying, continue to dry at 100℃ for 12h and take it out. It is calcined at 350℃ for 2h, then cooled and granulated to obtain the finished catalyst. 5g of the obtained catalyst is packed into the fixed bed reactor, and the reaction space velocity is 3600h-1, The reaction temperature is 30℃, the formaldehyde concentration in the air can be reduced from 1.0mg / m within 24h3Reduced to 0mg / m3, Th...

Embodiment 2

[0018]Take 10g of manganese oxide carrier, the specific surface area of ​​manganese oxide carrier is 50m2 / g, the pore volume is 0.3cm3 / g, manganese is +2 valence. Prepare platinum nitrate solution with platinum concentration of 0.1g / ml, prepare gold nitrate solution with gold concentration of 0.05g / ml, take 1ml platinum nitrate solution, 1ml gold nitrate solution, add 20ml deionized water, total 22ml. Add 10g of manganese oxide carrier to the solution, immerse for 12h under stirring, dry at 120℃ for 12h after immersion, wash 4 times with 15ml of deionized water after drying, continue to dry at 120℃ for 12h and take it out. It is calcined at 350℃ for 2h, then cooled and granulated to obtain the finished catalyst. 5g of the obtained catalyst is packed into the fixed bed reactor, and the reaction space velocity is 7200h-1, The reaction temperature is 40℃, the formaldehyde concentration in the air can be reduced from 1.0mg / m within 24h3Reduced to 0mg / m3, The conversion rate is 100%.

Embodiment 3

[0020]Take 10g of the manganese oxide carrier, the specific surface area of ​​the manganese oxide carrier is 150m2 / g, the pore volume is 0.1cm3 / g, manganese is +3. Prepare platinum nitrate solution with a platinum concentration of 0.1g / ml, prepare ruthenium nitrate solution with a ruthenium concentration of 0.05g / ml, take 1ml of platinum nitrate solution and 1ml of ruthenium nitrate solution, add 23ml of deionized water, a total of 25ml. Add 10g of manganese oxide carrier to the solution, immerse it for 6h under stirring, dry at 100℃ for 12h after immersion, wash 5 times with 15ml of deionized water after drying, continue to dry at 100℃ for 12h and take it out. It is calcined at 350℃ for 2h, then cooled and granulated to obtain the finished catalyst. 5g of the obtained catalyst is packed into the fixed bed reactor, and the reaction space velocity is 3600h-1, The reaction temperature is 30℃, the formaldehyde concentration in the air can be reduced from 1.0mg / m within 24h3Reduced to 0...

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Abstract

The invention belongs to a catalyst for catalytic oxidation reaction of formaldehyde as well as a preparation method and application thereof, and particularly relates to a manganese oxide loaded noblemetal monatomic formaldehyde oxidation catalyst as well as a preparation method and application thereof. Manganese oxide with formaldehyde catalytic oxidation activity is used as an active carrier, aprecious metal active center can be supplemented, and the reaction activity of the catalyst is improved through a synergistic effect. Through modulation of a preparation mode, catalyst composition content and related key conditions, noble metal active center distribution of the catalyst is adjusted, noble metal atom coordination number is reduced, and a noble metal active center with single atomdistribution is obtained. Uniform and stable positioning of noble metal single atoms is realized by utilizing the characteristics that manganese species are mixed in multiple valence states, rich in pore structure and more in defect sites, so that better catalytic activity and stability are obtained.

Description

Technical field[0001]The invention belongs to a catalyst for catalytic oxidation of formaldehyde, and a preparation method and application thereof, in particular to a noble metal monoatomic formaldehyde oxidation catalyst supported by manganese oxide, and a preparation method and application thereof.Background technique[0002]Formaldehyde has clear carcinogenic and teratogenic effects and is an important indoor pollutant. At present, the treatment methods of formaldehyde pollution mainly include ventilation method, biological purification method, physical adsorption method, plasma method, photocatalytic oxidation method and catalytic oxidation method. Among them, the application scenarios of ventilation method and biological purification method are limited, and the purification effect is unstable; the physical adsorption method has the problem of saturated regeneration of adsorbent materials, which is difficult to work continuously for a long time; the plasma method and photocatalyti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/656B01J35/00B01J35/10B01D53/86B01D53/72
CPCB01D53/8668B01J23/6562B01J35/0046B01J35/10
Inventor 刘平吉可明张侃荀家瑶田艳青
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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