Structured Manufacturing Data (2026)

Selective Catalytic Reduction (SCR) Catalyst

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Selective Catalytic Reduction (SCR) Catalyst used in the Motor Vehicle Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Selective Catalytic Reduction (SCR) Catalyst is characterized by the integration of Catalyst Substrate and Washcoat. In industrial production environments, manufacturers listed on CNFX commonly emphasize Vanadium Pentoxide (V₂O₅) on Titanium Dioxide (TiO₂) substrate construction to support stable, high-cycle operation across diverse manufacturing scenarios.

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

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Product Specifications

Technical details and manufacturing context for Selective Catalytic Reduction (SCR) Catalyst

Definition
A critical component within the Exhaust Aftertreatment System of diesel and lean-burn engines, the SCR Catalyst facilitates a chemical reaction where nitrogen oxides (NOx) in the exhaust gas are reduced to harmless nitrogen (N₂) and water (H₂O) using a reductant agent, typically ammonia derived from a urea solution (AdBlue/DEF). It is essential for meeting stringent emissions regulations.
Working Principle
Exhaust gas containing NOx passes over the catalyst surface. A urea-water solution is injected upstream, decomposing into ammonia (NH₃). On the catalyst's active sites, ammonia reacts with NOx in a selective catalytic reduction reaction, forming nitrogen and water vapor. Common catalyst formulations include vanadium-based or zeolite-based materials.
Common Materials
Vanadium Pentoxide (V₂O₅) on Titanium Dioxide (TiO₂) substrate, Copper-Zeolite or Iron-Zeolite
Technical Parameters
  • Catalyst cell density, affecting surface area and backpressure. (cells per square inch (CPSI)) Customizable
Components / BOM
  • Catalyst Substrate
    Provides a high-surface-area ceramic or metallic honeycomb structure to support the active catalytic coating.
    Material: Cordierite ceramic or metallic alloy (e.g., FeCrAl)
  • Washcoat Part
    A porous layer applied to the substrate to increase surface area and anchor the active catalytic material.
    Material: Alumina (Al₂O₃), Titanium Dioxide (TiO₂)
  • Active Catalytic Material Part
    The chemical compound that catalyzes the SCR reaction between NOx and ammonia.
    Material: Vanadium Pentoxide (V₂O₅), Copper-Zeolite (Cu-Zeolite)
  • Catalyst Canning / Housing
    Metal shell that contains and protects the catalyst brick, ensuring proper gas flow and mechanical integrity.
    Material: Stainless steel

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Selective Catalytic Reduction (SCR) Catalyst.

SCR Catalyst NOx Catalyst DeNOx Catalyst selective catalytic reduction catalyst for trucks vanadium pentoxide SCR catalyst automotive copper-zeolite NOx reduction catalyst SCR catalyst housing and canning titanium dioxide substrate washcoat

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Exhaust Aftertreatment System
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Up to 10 bar (typical 1-5 bar)
flow rate: 0.5-50 m/s gas velocity
temperature: 250-450°C (optimal 300-400°C)
space velocity: 5000-30000 h⁻¹ (typical 15000-25000 h⁻¹)
ammonia to nox ratio: 0.8-1.2 (optimal 1.0)
Media Compatibility
✓ Diesel exhaust gases ✓ Natural gas turbine exhaust ✓ Coal-fired boiler flue gas
Unsuitable: High sulfur content (>50 ppm) or halogen-containing environments
Sizing Data Required
  • NOx concentration at inlet (ppm)
  • Total exhaust gas flow rate (Nm³/h)
  • Required NOx removal efficiency (%)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Catalyst poisoning
Cause: Contamination from sulfur, phosphorus, or heavy metals in the flue gas, which adsorb onto active sites and reduce NOx conversion efficiency.
Thermal degradation
Cause: Exposure to temperatures above the catalyst's design limit, often due to improper burner operation or system malfunctions, leading to sintering and loss of surface area.
Maintenance Indicators
  • Visible ammonia slip (white plume) from the stack, indicating poor NOx conversion and potential catalyst deactivation.
  • Abnormally high pressure drop across the SCR reactor, suggesting catalyst blockage or physical damage.
Engineering Tips
  • Implement strict fuel quality control and upstream gas conditioning to minimize contaminants like sulfur and particulates before the SCR unit.
  • Install and maintain precise temperature monitoring and control systems to prevent thermal excursions and ensure optimal operating temperature windows.

Compliance & Manufacturing Standards

Reference Standards
ISO 9001:2015 - Quality Management Systems ASTM D5758-01(2019) - Standard Guide for Characterization of Spent Selective Catalytic Reduction (SCR) Catalysts CE Marking - EU Directive 2007/46/EC (for vehicle emissions systems)
Manufacturing Precision
  • Cell Density: +/- 5 cells/cm²
  • Wall Thickness: +/- 0.05 mm
Quality Inspection
  • X-ray Fluorescence (XRF) Analysis for active metal content
  • Pressure Drop Test for flow uniformity

Factories Producing Selective Catalytic Reduction (SCR) Catalyst

Manufacturer profiles with relevant production capability in China

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the primary function of an SCR catalyst in motor vehicles?

The SCR catalyst reduces harmful nitrogen oxide (NOx) emissions by converting them into harmless nitrogen (N₂) and water (H₂O) through a chemical reaction with a reductant like ammonia or urea.

What are the key material differences between vanadium-based and zeolite-based SCR catalysts?

Vanadium-based catalysts (V₂O₅ on TiO₂) offer high activity at moderate temperatures, while copper-zeolite or iron-zeolite catalysts provide superior performance at higher temperatures and better hydrothermal stability.

How does the catalyst substrate and washcoat affect SCR system performance?

The substrate (typically ceramic or metallic) provides structural support and surface area, while the washcoat evenly distributes the active catalytic material to maximize NOx conversion efficiency and durability.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data basis: CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks for Motor Vehicle Manufacturing.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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