Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Asymmetric low-temperature catalytic filter material and preparation method thereof

A technology for low-temperature catalysis and filtering materials, which is applied in catalyst activation/preparation, chemical instruments and methods, chemical elements of heterogeneous catalysts, etc. Optimal selection of catalytic reaction effect, high filtration precision, and effect of improving flue gas treatment efficiency

Active Publication Date: 2021-03-12
ZHEJIANG UNIV OF TECH
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the existing metal fiber sintered mesh is only used for high-temperature gas filtration, etc., and has low filtration precision and does not have the ability of SCR to remove nitrogen oxides, the present invention provides an asymmetric low-temperature SCR catalytic filter material

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Asymmetric low-temperature catalytic filter material and preparation method thereof
  • Asymmetric low-temperature catalytic filter material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] An asymmetric low-temperature catalytic filter material, which is a three-layer fiber mesh composite structure, is composed of three layers of metal fiber filter mesh, and the metal fiber used in the metal fiber filter mesh adopts formula 1, wherein the mesh number of the first layer of metal fiber filter mesh is 12 meshes, wire diameter 0.45mm, thickness 1.5mm; second metal fiber filter mesh 35 meshes, wire diameter 0.25mm, thickness 1.5mm; third layer metal fiber filter mesh 75 mesh, wire The diameter is 0.12mm and the thickness is 1.5mm. The above-mentioned metal fiber filter nets are stacked sequentially from top to bottom according to the mesh number of the filter nets from small to large, and are sintered at 1250°C for 2.5 hours under a pressure of 10 MPa to form a multi-layer fiber net composite structure. Further adopt the mode of modulation powder slurry to spray on the surface of the third layer of metal fiber filter screen with 360 order nickel-chromium-iron-...

Embodiment 2

[0058] Concrete operation is the same as embodiment 1, and different from embodiment 1 is:

[0059] The metal fiber filter mesh is stacked from top to bottom in order of mesh size from small to large, and sintered at 1300°C for 2 hours under a pressure of 10MPa to form a multi-layer fiber mesh composite structure. Then further use 500 mesh nickel-chromium-iron-iron-iron powder to spray on the surface of the third layer of metal fiber filter screen by modulating powder slurry. At the same time, PEG, PVB and PAA with a mass ratio of 1:1:1 are added as a binder, and the amount of the binder added is 10wt% of the nickel-chromium-iron-aluminium-iron powder, and the uniformly mixed powder slurry is sprayed on the wire The surface of the net is then dried at 100°C, and the spraying amount is 350g / m2 in terms of dry powder mass 2 , After sintering, a sintered metal powder filter layer is formed to form an asymmetric structure carrier.

Embodiment 3

[0061] Concrete operation is the same as embodiment 1, and different from embodiment 1 is:

[0062] The metal fiber filter mesh is stacked from top to bottom in the order of filter mesh size from small to large, and is sintered at 1250°C for 3 hours under the pressure of 10MPa to form a multi-layer fiber mesh composite structure. Subsequently, 300 mesh nickel-chromium-iron-iron-iron powder is sprayed on the surface of the third layer of metal fiber filter screen by modulating powder slurry. The liquid medium for adjusting the slurry is ethanol, and the amount of ethanol added is the mass of nickel-chromium-iron-iron-iron powder. At the same time, PVA is added as a binder. The amount of binder added is 5wt% of the nickel-chromium-iron-aluminium-iron powder. The uniformly mixed powder slurry is sprayed on the surface of the screen, and then dried at 80°C. The spraying amount 250g / m2 based on dry powder mass 2 , After sintering, a sintered metal powder filter layer is formed to ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Particle sizeaaaaaaaaaa
Concentrationaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the field of catalytic materials, and particularly relates to an asymmetric low-temperature catalytic filter material and a preparation method thereof. The asymmetric low-temperature catalytic filter material comprises a plurality of layers of metal fiber filter screens, wherein the plurality of layers of metal fiber filter screens are formed by weaving metal fibers with different wire diameters, the metal fiber filter screens are arranged in a stacked mode from large to small or from small to large according to the mesh number, and a multi-layer fiber screen compositestructure is formed through pressure sintering; alloy powder is sprayed on the metal fiber filter screen on the smallest mesh number side of the multi-layer fiber net composite structure, and an oversintered metal powder filter layer is formed after sintering; and the metal fiber filter screen is loaded with a denitration catalyst. The filter material provided by the invention can improve the efficiency and quality of industrial flue gas treatment, has good mechanical properties and corrosion resistance, and can prevent smoke particles from entering a catalyst loading part, avoid erosive wearand smoke coverage and prolong the service life compared with a homogeneous filtration catalytic material, and is also easy to regenerate and reuse.

Description

technical field [0001] The invention belongs to the field of catalytic materials, in particular to an asymmetric low-temperature catalytic filter material and a preparation method thereof. Background technique [0002] Air pollution is one of the most prominent environmental problems in the world at present, and industrial waste gas is an important source of air pollutants. A large amount of industrial waste gas is discharged into the atmosphere, which will inevitably reduce the quality of the atmospheric environment and bring serious harm to human health. At present, the high-temperature gas purification and dust removal technology using metal fiber materials has been popularized and applied in modern energy-saving and environmental protection engineering systems. [0003] There are many kinds of metal fiber materials, such as 316L, 310S, Hastelloy, iron-chromium-aluminum alloy, etc. According to different materials, the temperature resistance of alloy filter materials is...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01J23/86B01J23/889B01J37/02B01J37/08B01J35/06B01J35/10B01D39/20B01D46/00B01D53/86B01D53/56
CPCB01J23/866B01J23/8892B01J37/0215B01J37/08B01J37/0018B01J23/002B01D39/20B01D46/0001B01D46/0027B01D53/8628B01J2523/00B01D2258/0283B01D2239/0407B01J35/58B01J35/61B01J2523/3712B01J2523/68B01J2523/69B01J2523/72Y02A50/2351
Inventor 张惠斌余航王龙飞
Owner ZHEJIANG UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com