Supercharge Your Innovation With Domain-Expert AI Agents!

A kind of preparation method of vanadium-based SCR catalyst for diesel vehicle exhaust purification

An SCR catalyst and tail gas purification technology, applied in the field of catalysis, can solve problems such as inability to guarantee durability and stability, inability to effectively disperse, fix, and inability to guarantee durability, and achieve reduced manufacturing costs, low post-processing costs, and high stability reliable effect

Active Publication Date: 2016-04-06
SINOCAT ENVIRONMENTAL TECH
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, directly mixing titanium dioxide, vanadium, and tungsten to make a slurry, the tungsten and vanadium in the solution will migrate and enrich with the evaporation of water, resulting in uneven dispersion, easy sintering, and poor durability and stability.
[0006] Invention patent CN102698736A discloses a technology of using titanium and tungsten powder as a carrier to prepare slurry through pulping. Since it has not been impregnated, dried, and roasted, the vanadyl oxalate in the solution will migrate during the drying process, resulting in poor dispersion. uniform, durability and stability cannot be guaranteed
[0007] Invention patent application 201010274007.4 discloses a method of directly preparing catalyst slurry by mixing titanium dioxide, but its tungsten and vanadium cannot be effectively dispersed and fixed, and its durability cannot be guaranteed. One coat achieves sufficient upload volume

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
  • A kind of preparation method of vanadium-based SCR catalyst for diesel vehicle exhaust purification
  • A kind of preparation method of vanadium-based SCR catalyst for diesel vehicle exhaust purification
  • A kind of preparation method of vanadium-based SCR catalyst for diesel vehicle exhaust purification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Dissolve 1kg of citric acid and 0.5kg of polyacrylic acid in 25kg of deionized water and stir evenly; add 0.97kg of ammonium vanadate (NH 4 VO 3 ) and 1.06kg of ammonium metatungstate were stirred and dissolved to obtain a mixed solution; 20.20kg of titanium dioxide was added under stirring and aged at 50°C for 2 hours to obtain a suspension; 4.2kg of silica sol (SiO in silica sol 2 The content is 25%, and the catalyst slurry is obtained by stirring evenly.

[0039] The prepared catalyst slurry is coated on a cordierite ceramic carrier by a coating machine, dried at 80° C. for 1 hour, and finally calcined at 300° C. for 1 hour to obtain the product.

Embodiment 2

[0047] Dissolve 2.0kg of tartaric acid in 30kg of deionized water and stir evenly; add 0.5kg of vanadyl sulfate and 0.7kg of ammonium paratungstate, stir and dissolve to obtain a mixed solution; add 15kg of metatitanic acid under stirring, and age at 90°C for 0.5h to obtain Suspension: add 3 kg of zirconium sol (the zirconium dioxide content in the zirconium sol is 10%), stir evenly to obtain catalyst slurry.

[0048] The prepared catalyst slurry is coated on a cordierite ceramic carrier by a coating machine, dried at 80° C. for 1 h; finally calcined at 650° C. for 0.5 h to obtain the product.

Embodiment 3

[0055] Dissolve 1.2kg of OP-10 and 1.8kg of hydrogen peroxide in 35kg of deionized water, and stir evenly; add 1.2kg of vanadium pentoxide and 1.5kg of ammonium tungstate, stir and dissolve to obtain a mixed solution; add 28kg of metatitanic acid while stirring, Aging at 70° C. for 3 hours to obtain a suspension; add 6 kg of aluminum sol and stir evenly to obtain a catalyst slurry.

[0056] Coat the prepared catalyst slurry on a cordierite ceramic carrier through a coating machine, dry at 150°C for 0.5h; finally bake at 250°C for 5h to obtain the product.

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

No PUM Login to View More

Abstract

The present invention relates to a method for preparing a catalyst coating for removing nitrogen oxides from tail gas of a diesel vehicle. The catalyst is composed of V2O5, WO3 and TiO2. Fresh and aging sample bench tests show that the coating has a high nitrogen oxide removal rate (≥85%) at 250°C to 500°C, and the coating passes the ETC and ESC working condition cycle tests and conforms to the national IV emission limit. In the process, size mixing is conducted on the precursor to obtain catalyst slurry at one step, and the catalyst slurry is subjected to primary coating (the coated amount ≥210 g / L), drying, and roasting to obtain a honeycomb catalyst. The process is simple, has a low cost and high stability, and is suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and relates to a method for preparing a catalyst, in particular to a method for preparing a vanadium-based SCR catalyst for purifying diesel vehicle exhaust. Background technique [0002] Nitrogen oxides (NO x ) is one of the most important pollutants in the atmosphere. It not only has strong biological toxicity, especially stimulates the respiratory system, but also is one of the main causes of acid rain and photochemical smog. Today's air pollution is serious, control NO x There is no delay in the emission of emissions, and countries around the world have widely introduced laws to limit emissions. [0003] Various NO x In removal technology, NH 3 -SCR has become the mainstream of the market because of its high efficiency, durability and mature technology. Among them, vanadium-based SCR is widely used because of its good activity, excellent sulfur resistance, mature technology and low pr...

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
Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/30B01D53/94B01D53/56
CPCB01D53/56B01D53/94B01J21/06B01J23/22B01J23/30
Inventor 张鹏李云徐磊李奎吴春燕
Owner SINOCAT ENVIRONMENTAL TECH
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com