INDUSTRY COMPONENT

Catalyst (Active Material)

Active material component in Diesel Oxidation Catalysts that converts harmful exhaust pollutants into less toxic substances through catalytic oxidation.

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Component Specifications

Definition
The catalyst active material in Diesel Oxidation Catalysts (DOC) is a critical component consisting of precious metals (typically platinum, palladium, or combinations) supported on ceramic or metallic substrates. This material facilitates chemical reactions that convert carbon monoxide (CO), hydrocarbons (HC), and particulate matter in diesel exhaust into carbon dioxide (CO₂) and water (H₂O) through oxidation processes at elevated temperatures.
Working Principle
The active material operates on heterogeneous catalysis principles where precious metal sites adsorb oxygen molecules and diesel exhaust pollutants. Through surface reactions, these pollutants undergo oxidation: CO + ½O₂ → CO₂ and HC + O₂ → CO₂ + H₂O. The catalyst lowers activation energy for these reactions, enabling conversion at typical diesel exhaust temperatures (200-600°C).
Materials
Precious metals: Platinum (Pt), Palladium (Pd), or Pt/Pd alloys; Support materials: Ceramic (cordierite, alumina) or metallic (stainless steel) substrates with washcoat (γ-alumina, ceria-zirconia); Loading: 50-150 g/ft³ precious metal loading.
Technical Parameters
  • Space Velocity 20,000-100,000 h⁻¹
  • Sulfur Tolerance Low to moderate
  • Thermal Stability Up to 1000°C
  • Conversion Efficiency >90% for CO and HC
  • Light-off Temperature 150-250°C
  • Operating Temperature 200-600°C
  • Precious Metal Loading 50-150 g/ft³
  • Substrate Cell Density 200-600 cpsi
Standards
ISO 16183, ISO 19702, DIN 70070, SAE J1939

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Catalyst (Active Material).

diesel oxidation catalyst DOC catalyst active material automotive catalyst emission control platinum catalyst palladium catalyst exhaust aftertreatment diesel emissions Catalyst (Active Material) Catalyst (Active Material) in Motor Vehicle Manufacturing

Parent Products

This component is used in the following industrial products

Diesel Oxidation Catalyst (DOC)

An exhaust aftertreatment device that oxidizes carbon monoxide (CO) and hydrocarbons (HC) in diesel exhaust gases to reduce emissions.

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Engineering Analysis

Risks & Mitigation
  • Thermal degradation at high temperatures
  • Sulfur poisoning from fuel contaminants
  • Physical damage from vibration/impact
  • Catalyst deactivation from oil/fuel additives
  • Incomplete regeneration leading to soot accumulation
FMEA Triads
Trigger: Excessive exhaust temperatures (>800°C)
Failure: Thermal sintering of precious metal particles
Mitigation: Implement temperature sensors and control algorithms; use thermally stable support materials
Trigger: High sulfur content in fuel
Failure: Sulfate formation blocking active sites
Mitigation: Use low-sulfur diesel fuel; incorporate sulfur-tolerant catalyst formulations
Trigger: Mechanical vibration and thermal cycling
Failure: Washcoat detachment from substrate
Mitigation: Optimize washcoat adhesion; implement vibration-resistant mounting systems

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±5% conversion efficiency variation from certified values; ±2% precious metal loading tolerance
Test Method
Bench reactor testing per ISO 19702; engine dynamometer testing per ISO 16183; vehicle testing per WLTP/FTP-75 cycles

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

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 DOC active material?

To oxidize carbon monoxide and unburned hydrocarbons in diesel exhaust into less harmful carbon dioxide and water through catalytic reactions.

Why are precious metals used in DOC catalysts?

Precious metals like platinum and palladium provide excellent catalytic activity, thermal stability, and resistance to poisoning compared to base metals.

What factors affect DOC catalyst performance?

Temperature, exhaust composition, sulfur content, precious metal loading, substrate design, and aging conditions significantly impact conversion efficiency.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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.

Request Manufacturing Insight for Catalyst (Active Material)

Canister/Shell Catalyst Washcoat