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Supported catalyst suitable for low-temperature plasma synergistic catalysis process as well as preparation and application thereof

A supported catalyst, low-temperature plasma technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc. Active, difficult to deal with production environment and other problems, to achieve good continuous degradation, strong environmental adaptability, good repeatability

Active Publication Date: 2021-03-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The compounding process has problems such as low compounding efficiency, changing the microstructure of the catalyst during the compounding process, and affecting the catalytic activity of the compounding agent. It is difficult to cope with the complex production environment, and cannot meet the increasingly stringent atmospheric environmental standards and requirements and the production environment. need

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0036] S1. Preparation of noble metal nanoparticles.

[0037] Au x Pt 1-x Preparation of Composite Nanoparticle Alloys. Wherein the value of x is determined by the volume of added chloroauric acid or chloroplatinic acid. A typical preparation ratio is as follows: Dissolve 0.1-5g of PVP in 100-200mL of deionized water, put it into a three-necked flask, and keep stirring in a hydrothermal environment of 60-80°C. Slowly add 0.2-5.0mL chloroplatinic acid (10-60mg / mL) and 0.2-5.0mL chloroauric acid (10-60mg / mL) dropwise, and keep stirring for 2-10min. Add 0.005-0.04g of potassium borohydride into 10-40mL of deionized water, slowly drop it into a three-necked flask after completely dissolving, and continue heating and stirring at 60-100°C for 0.5-4h. The above got Au x Pt 1-x Composite nanoparticle alloy, x stands for Au x Pt 1-x The mass fraction of Au in the composite nanoparticle alloy, 0<x<1.

[0038] (100%-y) Preparation of Au / yPt mixed nanoparticles, y represents the ...

Embodiment 1

[0048] The casing plasma reactor is used for the treatment of low-concentration malodorous gas. The simulated exhaust gas contains trimethylamine, the concentration of trimethylamine is 500ppm, and the rest is air. The control gas flow rate is 20L / min (residence time 3s), and the input voltage is 90V (energy density 199J / L). The catalyst uses Au 0.5 Pt 0.5 / α-MnO 2 , Au 0.5 Pt 0.5 The mass fraction of alloy nanoparticles modified is 2% (as α-MnO 2 as the benchmark), 0.5g prepared Au 0.5 Pt 0.5 / α-MnO 2 Put the catalyst into a beaker, add 50mL of aluminum sol and 100mL of absolute ethanol, and stir for 30min. Use a brush to evenly coat the suspension obtained after stirring on two carbon cloths with sizes of 250mm*240mm and 250mm*150mm. Dry at 80° C. for 6 hours to obtain the target supported catalyst. Finally, the removal rate of trimethylamine gas is 95%, the mineralization rate of trimethylamine is 85%, and the selectivity of carbon monoxide and carbon dioxide is 1...

Embodiment 2

[0054] The sleeve-type plasma reactor is used for the treatment of low-concentration malodorous gas. The simulated exhaust gas contains methylamine, and the rest is air. The concentration of methylamine is 100ppm. The control gas flow rate is 10L / min (residence time 6s), and the input voltage is 90V. (Energy density 199J / L). The catalyst uses 50% Au / 50% Pt / α-MnO 2 , the mass fraction of 50% Au / 50% Pt mixed nanoparticles modified is 4% (as α-MnO 2 as a benchmark). Take 1.0g prepared 50%Au / 50%Pt / α-MnO 2 Put the catalyst into a beaker, add 50mL aluminum sol and 120mL absolute ethanol, and stir for 60min. Use a brush to evenly coat the suspension obtained after stirring on two carbon cloths with dimensions of 250mm*240mm and 250mm*150mm that have been cut. Dry at 70° C. for 8 hours to obtain the target supported catalyst. Finally, the removal rate of methylamine gas was 85.6%, the mineralization rate of methylamine was 65.2%, and the selectivity of carbon monoxide and carbon ...

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Abstract

The invention discloses a supported catalyst suitable for a low-temperature plasma synergistic catalysis process, a preparation method of the supported catalyst and application of the supported catalyst in low-temperature plasma synergistic catalytic treatment of malodorous gas. The preparation method comprises the following steps of: adding noble metal modified alpha-MnO2 into a mixed solution ofalumina sol and absolute ethyl alcohol, uniformly mixing to obtain a turbid liquid, uniformly coating the surface of a porous carbon cloth carrier with the turbid liquid, and drying at the temperature of 60-90 DEG C to obtain the supported catalyst. The noble metal is Au and / or Pt, and the ratio of the noble metal modified alpha-MnO2 to the alumina sol to the absolute ethyl alcohol is (0.5-2.5g):(30-100mL): (20-250mL). The preparation method of the alumina sol comprises the following steps of: uniformly mixing pseudo-boehmite and deionized water according to a mass ratio of 1: (10-50) to obtain a mixed solution, dropwise adding 0.2-2 mol / L of a nitric acid solution into the mixed solution at 60-80 DEG C under the condition of continuous stirring until the mixed solution becomes transparent and has a pH value of 2-5, continuing to stir at 60-80 DEG C for 30-100 min, and cooling to obtain the alumina sol.

Description

technical field [0001] The invention relates to the field of supported catalysts, in particular to a supported catalyst suitable for a low-temperature plasma synergistic catalytic process and its preparation and application. Background technique [0002] With the improvement of people's living standards, malodorous gas has become a serious social and environmental problem. Malodorous gases have varying degrees of damage to the human respiratory system, circulatory system, digestive system, endocrine system, and nervous system. Living in a foul-smelling polluted environment for a long time can cause anorexia, insomnia, memory loss, mood disturbance and other diseases. [0003] Nitrogen-containing odor is a typical representative of odor, and it is the main source of odor in sewage treatment plants, farms, toilets, garbage transfer stations, landfills and other places. In addition, nitrogen-containing odor is also closely related to biopharmaceutical, petrochemical, food pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/68B01J35/10B01D53/86B01D53/72
CPCB01J23/688B01D53/86B01D53/8668B01J35/60
Inventor 吴忠标胡兆冬王海强
Owner ZHEJIANG UNIV
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