---
title: "Diesel Oxidation Catalyst (DOC)"
industry: "Motor Vehicle Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:DIESEL_OXIDATION_CATALYST_DOC"
  data_integrity_hash: "d35c740a12bdbc9d80dbfe5f86288eb7"
  source_authority: "https://cnfx.com"
  strict_mode: true
source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:DIESEL_OXIDATION_CATALYST_DOC"
  data_source_uri: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/diesel-oxidation-catalyst-doc.md"
  official_resource_url: "https://cnfx.com/industry/motor-vehicle-manufacturing/product/diesel-oxidation-catalyst-doc"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "200-650°C"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 800
    unit: "°C"
    consequence: "Thermal degradation of platinum group metal catalyst washcoat due to sintering above Tammann temperature (0.5×melting point of Pt = 961°C)"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Exhaust gas temperature exceeding 250°C during DPF regeneration cycles"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Closed-loop temperature control with zirconia oxygen sensors limiting regeneration to 600°C maximum"
  - node_2:
      trigger: "Sulfur concentration &gt;15 ppm in diesel fuel"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Ultra-low sulfur diesel (ULSD) specification compliance with &lt;10 ppm sulfur content"
bom_nodes:
  catalyst-washcoat:
    type: "component"
    urn: "URN:CNFX:ME:CATALYST_WASHCOAT"
    interface_type: "physical-logic-coupled"
  catalyst-active-material:
    type: "component"
    urn: "URN:CNFX:ME:CATALYST_ACTIVE_MATERIAL"
    interface_type: "physical-logic-coupled"
  canistershell:
    type: "component"
    urn: "URN:CNFX:ME:CANISTERSHELL"
    interface_type: "physical-logic-coupled"
  matsupport-material:
    type: "component"
    urn: "URN:CNFX:ME:MATSUPPORT_MATERIAL"
    interface_type: "physical-logic-coupled"
  catalyst-substrate:
    type: "part"
    urn: "URN:CNFX:ME:CATALYST_SUBSTRATE"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 16183:2002 (HEAVY DUTY ENGINES - MEASUREMENT OF GASEOUS EMISSIONS)"
    scope: "Verified Engineering Specification"
  - standard: "CE REGULATION (EU) 2016/427 (EURO 6 EMISSIONS STANDARDS FOR LIGHT PASSENGER AND COMMERCIAL VEHICLES)"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/diesel-oxidation-catalyst-doc.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "5ec9d9c1e5dc058304ba928e0715f9cba90d5daa156313ba70a48c63333772d8"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Diesel Oxidation Catalyst (DOC)

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

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **200-650°C**. Failure boundary: **800°C sustained for &gt;30 minutes**, Mechanism: **Thermal degradation of platinum group metal catalyst washcoat due to sintering above Tammann temperature (0.5×melting point of Pt = 961°C)**.

### 2.1 Analytical Physics Model
Governed by the **Heat Sterilization F0 Lethality Model**:

> **Primary Equation**: $F_0 = \int_{0}^{t} 10^{(T-121.1)/z} dt$  
> **Engineering Impact**: Validates microbial reduction integrity for aseptic packaging.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| T | Process Temp (°C) | **$T \in [200-650°C]$ °C** (Per `temperature_range`) |
| t | Exposure Time (min) | Engineering Constant |
| z | Z-value | **10 °C** (Standard for *C. botulinum*) |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Exhaust gas temperature exceeding 250°C during DPF regeneration cycles | 8 | Catalyst thermal deactivation through precious metal particle agglomeration | Closed-loop temperature control with zirconia oxygen sensors limiting regeneration to 600°C maximum |
| Sulfur concentration &gt;15 ppm in diesel fuel | 8 | Catalyst poisoning via sulfate formation on active sites | Ultra-low sulfur diesel (ULSD) specification compliance with &lt;10 ppm sulfur content |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | mm | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Catalyst Substrate](https://cnfx.com/llms/industry/chemical-manufacturing/product/catalyst-substrate.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Diesel Particulate Filter (DPF)**, **Selective Catalytic Reduction (SCR) System**, **Exhaust Gas Recirculation (EGR) Cooler**  
**Downstream Applications**: Heavy-Duty Diesel Trucks, Construction Equipment, Marine Diesel Engines  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: What is the primary function of a Diesel Oxidation Catalyst (DOC) in vehicle manufacturing?
**A**: 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.

### Q: What are the advantages of ceramic versus metallic substrates in DOCs?
**A**: 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.

### Q: How do precious metal catalysts like platinum and palladium work in DOCs?
**A**: 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.

## 6. Manufacturing Compliance
- ISO 16183:2002 (HEAVY DUTY ENGINES - MEASUREMENT OF GASEOUS EMISSIONS)
- CE REGULATION (EU) 2016/427 (EURO 6 EMISSIONS STANDARDS FOR LIGHT PASSENGER AND COMMERCIAL VEHICLES)

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Diesel Oxidation Catalyst (DOC)](https://cnfx.com/industry/motor-vehicle-manufacturing/product/diesel-oxidation-catalyst-doc)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **5** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: DIESEL_OXIDATION_CATALYST_DOC | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 66a89f4f
