Catalyst Ageing Apparatus Using Recirculated Gas Mixture
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Solution Overview
Problem
Current methods for ageing catalyst materials in catalytic converters are costly and lack precise control over gas constituents, as they rely on combustion of C-containing fuels and burners, leading to inefficient and inaccurate testing.
Innovation Solution
A method involving the heating of a gaseous stream with pure hydrocarbon and oxygen-containing gases, which are recirculated to maintain accurate C, H, and O proportions, and electrically heated to reduce costs and improve control, allowing for efficient and accurate catalyst ageing without combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If combustion of C-containing fuel in a burner is used to provide hot ageing gas, then the catalyst material can be aged, but the operating costs become very high (>$50,000)
Solution Approach 1:
The invention changes the chemical composition parameters of the ageing gas from combustion-based (CO2, H2O, N2 with impurities) to a controlled mixture of CO, H2, and O2 gases. This parameter change eliminates the need for expensive fuel combustion while maintaining the high-temperature ageing capability, thereby dramatically reducing operating costs while preserving catalyst ageing reliability
Solution Approach 2:
The invention replaces the mechanical combustion system (burner requiring fuel supply, air intake, flame control) with a direct gas injection system. By injecting pre-mixed CO/H2/O2 gases directly into the exhaust stream, the system eliminates the burner infrastructure and its associated high operating costs, while still achieving the required thermal conditions for catalyst ageing
2Reliability
If combustion of C-containing fuel in a burner is used to provide hot ageing gas, then the catalyst material can be aged, but precise control over gas constituents is lost
Solution Approach 1:
The invention precisely controls the composition parameters of the ageing gas by using predetermined ratios of CO, H2, and O2 gases. The gas mixture is formulated with specific concentrations (e.g., CO: 5-15%, H2: 5-15%, O2: 5-15%) that can be accurately measured and controlled, providing precise control over the chemical environment for catalyst ageing
Solution Approach 2:
The system incorporates feedback control through gas analysis instruments that continuously monitor the composition of the ageing gas. This feedback mechanism allows real-time adjustment of gas flow rates to maintain precise control over CO, H2, and O2 concentrations, ensuring consistent and accurate catalyst ageing conditions
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
This approach significantly reduces operating costs, provides precise control over the ageing process, and maintains stable conditions for catalyst testing, enabling efficient and accurate simulation of realistic use scenarios.
Implementation Method 1
heating a gaseous stream
Implementation Method 2
adding a least one pure hydrocarbon gas and an oxygen-containing gas to the heated gaseous stream
Implementation Method 3
passing the combined stream through the catalyst material
Data Source
AI summary
A method of ageing a catalyst material includes at least the steps of: (a) heating a gaseous stream; (b) adding a least one pure hydrocarbon gas and an oxygen-containing gas to the heated gaseous stream to provide a combined stream; and (c) passing the combined stream through the catalyst material. The use of at least one pure hydrocarbon gas and an oxygen-containing gas allows maximum re-circulation of the exit stream from the catalyst material for reuse, while maintaining the correct C, H and O proportions being provided in the combined stream to replicate realistic use of the catalyst material.