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Application of a monolithic electrothermal wire mesh catalyst in the catalytic combustion of volatile organic waste gases

A volatile organic, wire mesh technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, combustion types, etc., can solve the problems of low energy utilization rate and high energy consumption, etc. Achieve the effect of high energy utilization, low energy consumption and high thermal stability

Active Publication Date: 2019-05-31
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This heating method consumes a lot of energy, and the energy utilization rate is low

Method used

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  • Application of a monolithic electrothermal wire mesh catalyst in the catalytic combustion of volatile organic waste gases
  • Application of a monolithic electrothermal wire mesh catalyst in the catalytic combustion of volatile organic waste gases
  • Application of a monolithic electrothermal wire mesh catalyst in the catalytic combustion of volatile organic waste gases

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Surface pretreatment of iron-chromium-aluminum wire (wherein chromium: 23-26%, aluminum: 4.5-6.5%, and the rest is iron): take a certain length of wire and roll it into a spiral shape. Put the metal wire in acetone, ultrasonic for 30min, and rinse with distilled water. Then place the metal wire in 10wt% NaOH solution for 30min and rinse it with distilled water. Finally put the wire in 10wt% HNO 3 Sonicate the solution for 30 min, rinse with distilled water, and dry at 110°C for 2 h.

[0023] Preparation of FeCrAl wire surface coating: put the wire mesh in a pure oxygen atmosphere, and calcined at 950°C for 3h.

[0024] Preparation of noble metal Pd nanoparticles: Weigh 0.0176g palladium chloride, add 3mL oleylamine and 1mL oleic acid, under nitrogen atmosphere, magnetically stir, react at 180°C for 3h. After cooling to room temperature, transfer to a centrifuge tube. Add 3 times the volume of absolute ethanol, centrifuge (6000rpm, 5min), and precipitate, repeat the ...

Embodiment 2

[0028] Surface pretreatment of iron-chromium-aluminum wire (wherein chromium: 23-26%, aluminum: 4.5-6.5%, and the rest is iron): take a certain length of wire and roll it into a spiral shape. Put the metal wire in acetone, ultrasonic for 30min, and rinse with distilled water. Then place the metal wire in 10wt% NaOH solution for 30min and rinse it with distilled water. Finally put the wire in 10wt% HNO 3 Sonicate in the solution for 30min, rinse with distilled water, and dry at 110°C for 2h.

[0029] Preparation of FeCrAl wire surface coating: place the wire mesh in a pure oxygen atmosphere, and calcinate it at 950°C for 3h.

[0030] Preparation of noble metal Pd nanoparticles: Weigh 0.0352g palladium chloride, add 6mL oleylamine and 2mL oleic acid, under nitrogen atmosphere, magnetically stir, react at 180°C for 3h. After cooling to room temperature, transfer to a centrifuge tube. Add 3 times the volume of absolute ethanol, centrifuge (6000rpm, 5min), precipitate, and repe...

Embodiment 3

[0034]Surface pretreatment of iron-chromium-aluminum wire (wherein chromium: 23-26%, aluminum: 4.5-6.5%, and the rest is iron): take a certain length of wire and roll it into a spiral shape. Put the metal wire in acetone, ultrasonic for 30min, and rinse with distilled water. Then place the metal wire in 10wt% NaOH solution for 30min and rinse it with distilled water. Finally put the wire in 10wt% HNO 3 Sonicate the solution for 30 min, rinse with distilled water, and dry at 110°C for 2 h.

[0035] Preparation of FeCrAl wire surface coating: put the wire mesh in a pure oxygen atmosphere, and calcined at 950°C for 3h.

[0036] Preparation of noble metal Pd nanoparticles: Weigh 0.0704g palladium chloride, add 12mL oleylamine and 4mL oleic acid, under nitrogen atmosphere, magnetically stir, react at 180°C for 3h. After cooling to room temperature, transfer to a centrifuge tube. Add 3 times the volume of absolute ethanol, centrifuge (6000rpm, 5min), and precipitate, repeat the ...

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Abstract

The application of an integral electrothermal metal mesh catalyst in catalytic combustion of volatile organic waste gas. The catalyst is prepared according to the following steps: (1) Place the metal mesh material in acetone to remove oil by ultrasonic, and rinse it with distilled water. ; Then place the metal mesh in NaOH solution for ultrasonic treatment, rinse with distilled water; finally, place the metal mesh in HNO 3 Ultrasound in the solution to remove surface oxides, rinse with distilled water, and then dry; (2) Place the pretreated metal mesh in pure oxygen to calcine; (3) Spray the Pt or Pd nanoparticle sol dispersion on the calcined The final metal mesh is then dried and then calcined to obtain a monolithic electrothermal metal mesh catalyst loaded with Pt or Pd nanoparticles. The active components of the catalyst of the present invention are highly dispersed and difficult to agglomerate, and have strong binding ability with the carrier. It has the characteristics of small amount of precious metals, high activity, and self-heating when energized, making the application energy-saving, efficient, and fast-responsive.

Description

technical field [0001] The invention relates to the application of an integral electrothermal wire mesh catalyst in the catalytic combustion of volatile organic waste gases (VOCs). Background technique [0002] The existing combustion catalysts for volatile organic compounds (VOCs) mainly include granular and monolithic catalysts. Granular catalysts will produce "hot spots" and local high temperature in the strong exothermic reaction of catalytic combustion, the catalyst is easy to sinter and deactivate, and the pressure drop of the catalyst bed is high, so it is not suitable for the treatment of large flux of organic waste gas. At present, monolithic catalysts often use honeycomb ceramic substrates (such as cordierite) as carriers, but honeycomb ceramic substrates have disadvantages such as low mass and heat transfer efficiency, low mechanical strength, and poor structural adjustment. The monolithic catalyst composed of metal wire as a carrier has the characteristics of lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23G7/07B01J23/89
CPCF23G7/07B01J23/8993B01J35/394B01J35/393B01J35/56
Inventor 卢晗锋李浩周瑛朱秋莲汪月席康
Owner ZHEJIANG UNIV OF TECH