SCR Conduit Coating for Platinum Capture in Exhaust Aftertreatment

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Solution Overview

Problem

Existing aftertreatment systems for internal combustion engines face challenges in capturing and deactivating platinum emissions, which can lead to decreased NOx conversion and increased N2O emissions due to the sensitivity of iron-based SCR catalysts to platinum exposure.

Innovation Solution

An aftertreatment system with a conduit coated with copper, phosphorus, sodium, or silicon dioxide that captures and deactivates platinum emissions before they reach the SCR unit, using a coating that poisons the platinum's oxidizing ability and prevents migration to the SCR catalyst.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional aftertreatment system is used without a coating on the conduit, then the system structure is simple, but platinum emissions migrate to the SCR unit causing decreased NOx conversion and increased N2O emissions

Engineering Contradiction:

ImproveNOx conversion efficiencyVSAvoidsystem structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

A coating layer comprising copper, phosphorus, sodium, or silicon dioxide is applied to the conduit surface between the DOC and SCR unit. This coating acts as an intermediary that captures and deactivates platinum emissions before they reach the SCR catalyst, preventing platinum migration while maintaining system functionality.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The coating is applied in advance to the conduit surface to prevent platinum migration before it occurs. By pre-equipping the conduit with capture-capable materials, the system proactively prevents platinum emissions from reaching the SCR unit, avoiding catalyst deactivation.

Inventive Principle:

Principle #10Preliminary action

2Duration of action of stationary object

If a coating is applied to the conduit to capture platinum emissions, then platinum migration is prevented and SCR catalyst lifetime is extended, but the manufacturing complexity increases

Engineering Contradiction:

ImproveSCR catalyst lifetimeVSAvoidcoating application process

Core Design Contradiction:

Duration of action of stationary objectVSEase of manufacture

Solution Approach 1:

The coating materials (copper, phosphorus, sodium, or silicon dioxide) are selected and applied in specific compositions and concentrations to optimize platinum capture effectiveness. By adjusting material parameters and their ratios, the coating achieves maximum deactivation capability while managing manufacturing complexity.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The coating is formulated as a composite material system combining multiple elements (copper, phosphorus, sodium, silicon dioxide) that work synergistically to capture and deactivate platinum. This composite approach enhances capture effectiveness while allowing flexibility in manufacturing processes.

Inventive Principle:

Principle #40Composite materials

3Productivity

If the SCR unit is exposed to platinum emissions, then the system operates without additional components, but NOx conversion decreases and N2O emissions increase

Engineering Contradiction:

Improvesystem operation efficiencyVSAvoidN2O emissions

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The harmful platinum emissions are extracted and removed from the exhaust gas stream by the coating material before they can reach the SCR unit. The coating selectively captures platinum species, separating them from the main exhaust flow and preventing their interaction with the SCR catalyst.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The coating converts the harmful platinum emissions into a beneficial capture mechanism. By designing the coating with specific materials that have high affinity for platinum, the system transforms potential catalyst poison into a controlled capture process that protects the SCR unit while maintaining overall system efficiency.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The system effectively extends the lifetime of the SCR catalyst by preventing platinum migration, maintaining NOx conversion efficiency and reducing N2O emissions, thereby enhancing the overall performance of the aftertreatment system.

Implementation Method 1

The coating is configured to capture and deactivate platinum passing through the conduit

Methodology Applied

Scientific EffectAdsorption: Adsorption

Implementation Method 2

The coating includes at least one of copper, phosphorus, sodium, or silicon dioxide... configured to capture and deactivate platinum

Methodology Applied

Scientific EffectChemical bonding: Chemical Bonding

Data Source

PatentUS12577899B2Aftertreatment system

Publication Date: 2026.03.17 CUMMINS INC

AI summary

An aftertreatment system includes a dosing module. The aftertreatment system includes a selective catalytic reduction unit disposed fluidly downstream of the dosing module. The aftertreatment system includes a conduit fluidly connecting the dosing module to the selective catalytic reduction unit. The conduit has a coating disposed on a surface thereof. The coating is exposed to exhaust passing through the conduit and to the selective catalytic reduction unit. The coating is configured to capture and deactivate platinum passing through the conduit.