INDUSTRY COMPONENT

Washcoat

A porous ceramic coating applied to catalyst substrates to support active catalytic materials in SCR systems.

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Component Specifications

Definition
A washcoat is a thin, porous ceramic layer applied to the surface of catalyst substrates (typically honeycomb monoliths) in Selective Catalytic Reduction (SCR) systems. It serves as a high-surface-area support structure for active catalytic materials (such as vanadium, tungsten, or zeolite-based compounds) that facilitate the reduction of nitrogen oxides (NOx) with ammonia or urea. The washcoat enhances catalytic activity, thermal stability, and poison resistance while maintaining low pressure drop across the system.
Working Principle
The washcoat provides a large surface area for dispersing active catalytic sites, enabling the SCR reaction where NOx gases react with ammonia/urea to form nitrogen and water. Its porous structure maximizes gas-catalyst contact while minimizing diffusion limitations.
Materials
Typically composed of high-surface-area oxides like gamma-alumina (γ-Al2O3), titanium dioxide (TiO2), silica (SiO2), or mixed oxides, often doped with stabilizers (e.g., cerium, zirconium) to enhance thermal and chemical durability.
Technical Parameters
  • Porosity 40-70%
  • Thickness 20-150 μm
  • Surface Area 50-300 m²/g
  • Adhesion Strength >5 MPa
  • Thermal Stability Up to 700°C
Standards
ISO 11841-1, ISO 19745, DIN 70070

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Washcoat.

SCR washcoat catalyst coating NOx reduction ceramic coating automotive catalyst diesel aftertreatment porous substrate Washcoat Washcoat in Motor Vehicle Manufacturing

Parent Products

This component is used in the following industrial products

Selective Catalytic Reduction (SCR) Catalyst

A catalytic component that converts nitrogen oxides (NOx) into nitrogen and water using a reductant like ammonia or urea.

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Engineering Analysis

Risks & Mitigation
  • Washcoat detachment under thermal cycling
  • Pore blockage from contaminants (e.g., sulfur, ash)
  • Thermal degradation above 700°C
FMEA Triads
Trigger: Thermal expansion mismatch between washcoat and substrate
Failure: Cracking or detachment of washcoat layer
Mitigation: Use compatible materials with matched thermal expansion coefficients; apply intermediate layers; optimize coating process
Trigger: Exposure to high sulfur fuels or lubricant ash
Failure: Pore poisoning and reduced catalytic activity
Mitigation: Incorporate sulfur-resistant materials; implement periodic regeneration cycles; use low-ash lubricants

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Coating thickness ±10%, porosity ±5%, adhesion strength minimum 5 MPa
Test Method
ISO 11841-1 for coating adhesion, BET method for surface area, mercury porosimetry for pore distribution

Buyer Feedback

★★★★☆ 4.5 / 5.0 (34 reviews)

"Great transparency on the Washcoat components. Essential for our Motor Vehicle Manufacturing supply chain."

"The Washcoat we sourced perfectly fits our Motor Vehicle Manufacturing production line requirements."

"Found 30+ suppliers for Washcoat on CNFX, but this spec remains the most cost-effective."

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Frequently Asked Questions

What is the primary function of a washcoat in an SCR catalyst?

To provide a high-surface-area support for active catalytic materials, maximizing NOx conversion efficiency while ensuring mechanical and thermal stability.

How does washcoat porosity affect SCR performance?

Higher porosity increases surface area for catalytic reactions and reduces diffusion resistance, but must be balanced with mechanical strength to prevent washcoat detachment.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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