Structured Manufacturing Data (2026)

Diesel Oxidation Catalyst (DOC)

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Diesel Oxidation Catalyst (DOC) 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 Diesel Oxidation Catalyst (DOC) is characterized by the integration of Catalyst Substrate and Catalyst Washcoat. In industrial production environments, manufacturers listed on CNFX commonly emphasize Ceramic substrate (cordierite) construction to support stable, high-cycle operation across diverse manufacturing scenarios.

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

View Full Specifications Explore Manufacturing Sources

Product Specifications

Technical details and manufacturing context for Diesel Oxidation Catalyst (DOC)

Definition
The Diesel Oxidation Catalyst (DOC) is a critical component of the Exhaust Aftertreatment System in diesel engines. It uses a catalyst-coated substrate to facilitate chemical reactions that convert harmful pollutants—primarily carbon monoxide (CO) and unburned hydrocarbons (HC)—into less harmful carbon dioxide (CO₂) and water (H₂O) through oxidation. It also helps oxidize some particulate matter (soot) and plays a role in generating heat for downstream components like the Diesel Particulate Filter (DPF).
Working Principle
Exhaust gases flow through a honeycomb-like substrate (typically ceramic or metallic) coated with precious metal catalysts (like platinum, palladium). The catalyst lowers the activation energy required for oxidation reactions. At elevated exhaust temperatures, CO and HC react with oxygen (O₂) present in the exhaust stream to form CO₂ and H₂O.
Common Materials
Ceramic substrate (cordierite), Metallic substrate (stainless steel), Catalyst washcoat (alumina, ceria), Precious metal catalysts (platinum, palladium)
Technical Parameters
  • Diameter and length of the catalyst substrate/canister (mm) Customizable
Components / BOM
  • Catalyst Substrate
    Provides a high-surface-area structure for catalyst coating and exhaust gas flow
    Material: Cordierite ceramic or stainless steel
  • Catalyst Washcoat Part
    High-surface-area layer (e.g., alumina) that holds the precious metal catalyst particles
    Material: Alumina (Al₂O₃), ceria (CeO₂)
  • Catalyst (Active Material) Part
    Precious metals that catalyze the oxidation reactions
    Material: Platinum (Pt), Palladium (Pd)
  • Canister/Shell Part
    Outer metal housing that contains and protects the substrate
    Material: Stainless steel
  • Mat/Support Material Part
    Holds the substrate in place inside the canister and provides thermal insulation
    Material: Intumescent or non-intumescent ceramic mat

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Diesel Oxidation Catalyst (DOC).

DOC Oxidation Catalyst diesel oxidation catalyst for commercial vehicles DOC catalyst substrate materials comparison platinum palladium diesel oxidation catalyst ceramic vs metallic DOC substrate performance diesel exhaust aftertreatment system installation

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: Max 2 bar pressure drop across catalyst, system pressure up to 5 bar
flow rate: 10-100,000 m³/h (based on engine size and application)
temperature: 200-650°C (light-off: 200-250°C, max continuous: 650°C)
space velocity: 20,000-100,000 h⁻¹ (typical for DOC applications)
Media Compatibility
✓ Cordierite ceramic substrate with platinum/palladium washcoat ✓ Metallic substrate (stainless steel) with platinum-based catalyst ✓ Silicon carbide substrate with palladium/rhodium catalyst
Unsuitable: High sulfur fuel environments (>500 ppm sulfur) due to catalyst poisoning and sulfate formation
Sizing Data Required
  • Engine displacement and rated power (L/kW)
  • Exhaust gas flow rate at maximum engine load (m³/h)
  • Target emission reduction percentages for CO and HC

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Catalyst poisoning
Cause: Contamination from sulfur, phosphorus, or heavy metals in fuel/lubricants, reducing catalytic activity and increasing emissions.
Thermal degradation
Cause: Excessive exhaust temperatures from engine malfunctions or regeneration events, leading to catalyst sintering or substrate melting.
Maintenance Indicators
  • Sudden increase in exhaust backpressure or engine power loss
  • Visible smoke or abnormal odor from exhaust during normal operation
Engineering Tips
  • Use ultra-low sulfur diesel and certified low-ash engine oil to prevent catalyst poisoning
  • Monitor exhaust gas temperatures and ensure proper engine calibration to prevent thermal runaway

Compliance & Manufacturing Standards

Reference Standards
ISO 16183:2002 (Heavy duty engines - Measurement of gaseous emissions) ASTM D975-22 (Standard Specification for Diesel Fuel Oils) CE Regulation (EU) 2016/427 (Euro 6 emissions standards for light passenger and commercial vehicles)
Manufacturing Precision
  • Catalyst coating thickness: +/- 0.05 mm
  • Housing weld seam alignment: +/- 1.0 mm
Quality Inspection
  • Pressure drop test (verifies flow characteristics and structural integrity)
  • Catalyst activity test (measures conversion efficiency of CO and HC emissions)

Factories Producing Diesel Oxidation Catalyst (DOC)

Manufacturer profiles with relevant production capability in China

Add your factory

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.

Supply Chain Compatible Machinery & Devices

Automotive Battery Management System

Electronic control system for monitoring and managing vehicle battery packs.

Explore Specs →
Automotive Wireless Power Transfer System

Wireless charging system for electric vehicles using electromagnetic induction.

Explore Specs →
Automotive Solid-State Battery Pack

High-energy-density solid-state battery system for electric vehicles

Explore Specs →
Automotive Active Grille Shutter System

Aerodynamic system with motorized shutters for vehicle thermal and efficiency management.

Explore Specs →

Frequently Asked Questions

What is the primary function of a Diesel Oxidation Catalyst (DOC) in vehicle manufacturing?

The DOC oxidizes harmful carbon monoxide (CO) and unburned hydrocarbons (HC) in diesel exhaust into less harmful carbon dioxide (CO2) and water vapor, helping vehicles meet emission regulations.

What are the advantages of ceramic versus metallic substrates in DOCs?

Ceramic substrates (cordierite) offer excellent thermal shock resistance and lower cost, while metallic substrates (stainless steel) provide better mechanical durability, faster light-off, and compact designs for space-constrained applications.

How do precious metal catalysts like platinum and palladium work in DOCs?

Platinum and palladium act as active sites that facilitate oxidation reactions at lower temperatures, converting CO and HC efficiently while maintaining catalyst durability under high-temperature exhaust conditions.

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.

Request Manufacturing Insight for Diesel Oxidation Catalyst (DOC)

Ask for use case, specification boundaries, supplier type, and RFQ preparation information for Diesel Oxidation Catalyst (DOC).

Your business information is used only to process this request.

Thank you! Your message has been sent. We'll respond within 1–3 business days.
Thank you! Your message has been sent. We'll respond within 1–3 business days.

Need to Manufacture Diesel Oxidation Catalyst (DOC)?

Compare manufacturer profiles with relevant product and process capability.

Create Manufacturer Profile Contact Us
Previous Product
Die Cushion System
Next Product
Diesel Particulate Filter (DPF)