Application of integral type electrothermal wire mesh catalyst in catalytic combustion of volatile organic waste gas

A volatile organic and metal mesh technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, combustion method, etc., can solve the problems of high energy consumption and low energy utilization rate, Achieve the effects of low energy consumption, high energy utilization rate, and simple preparation method

Active Publication Date: 2017-09-22
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 integral type electrothermal wire mesh catalyst in catalytic combustion of volatile organic waste gas
  • Application of integral type electrothermal wire mesh catalyst in catalytic combustion of volatile organic waste gas
  • Application of integral type electrothermal wire mesh catalyst in catalytic combustion of volatile organic waste gas

Examples

Experimental program
Comparison scheme
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 the solution for 30 min, rinse with distilled water, and dry at 110°C for 2 h.

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

[0030] Preparation of noble metal Pd nanoparticles: Weigh 0.0352g palladium chloride, add 6mL oleylamine and 2mL oleic acid, stir magnetically under nitrogen atmosphere, and 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 t...

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 invention relates to application of an integral type electrothermal wire mesh catalyst in catalytic combustion of volatile organic waste gas. The catalyst is prepared by the following steps: (1) placing a wire mesh material in acetone, removing oil in an ultrasonic manner, washing the wire mesh material thoroughly with distilled water, placing a wire mesh in a NaOH solution, carrying out ultrasonic treatment on the wire mesh, washing the wire mesh thoroughly with the distilled water, finally, placing the wire mesh in an HNO3 solution, carrying out ultrasonic treatment on the wire mesh to remove oxide on the surface of the wire mesh, washing the wire mesh thoroughly with the distilled water, and then drying the wire mesh; (2) calcining the pretreated wire mesh in pure oxygen; and (3) spraying Pt or Pd nano-particle sol dispersion liquid to the calcined wire mesh, then drying the wire mesh, and calcining the wire mesh to obtain the Pt or Pd nano-particle-loaded integral type electrothermal wire mesh catalyst. The active components of the catalyst are dispersed highly, and cannot be agglomerated easily, the ability of the catalyst which is combined to a carrier is high, the catalyst has the characteristics of small use amount of precious metal, high activity, and capability of spontaneously heating after the catalyst is electrified, and therefore, the application has the characteristics of energy conservation, high efficiency and rapid reaction.

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 Applications(China)
IPC IPC(8): F23G7/07B01J23/89
CPCB01J23/8993B01J35/006B01J35/0066B01J35/04F23G7/07
Inventor 卢晗锋李浩周瑛朱秋莲汪月席康
Owner ZHEJIANG UNIV OF TECH
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