Catalyst (Active Material): Light-off Temperature 150-250°C

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

Parameter	Typical range	Notes & selection driver
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

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 16183, ISO 19702, DIN 70070, SAE J1939

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

Typical Suppliers & Equivalents

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

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Catalyst (Active Material)

Manufacturer profiles associated with Catalyst (Active Material).

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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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.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

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.

Catalyst (Active Material)