Self-Sustaining Electrochemical Promotion Catalyst
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fuel cell technologies face challenges in efficiently reforming hydrocarbons at low temperatures for solid oxide fuel cells, requiring high temperatures, large amounts of oxygen or steam, and precious metals, while also producing nitrogen oxides and coking catalysts.
Innovation Solution
A self-sustaining electrochemical promotion catalyst system comprising an oxygen ion conducting support, dispersed cathodic and anodic phases, and a sacrificial phase, which enables non-Faradaic electrochemical modification of catalytic activity without an external power source, stabilizing the electrochemical potential and preventing coking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional catalysts are used for hydrocarbon reforming, then high temperatures (>700°C) are required to achieve sufficient reaction rate, but this increases energy consumption and system complexity
Solution Approach 1:
The patent introduces an electrochemical intermediary system consisting of a solid electrolyte membrane and electrochemical cell that mediates the reforming process. This intermediary enables the catalyst to operate at lower temperatures by providing electrochemical assistance to the catalytic reaction, resolving the contradiction between reaction rate and operating temperature
Solution Approach 2:
The patent changes the operational parameters of the catalyst by applying electrochemical potential differences and controlling ion transport through the solid electrolyte. This parameter change allows the catalyst to achieve high productivity at lower temperatures than conventional thermal catalysis, directly addressing the temperature-productivity contradiction
2Reliability
If precious metals are used as catalyst active phases to improve catalytic activity, then coking is reduced, but catalyst cost increases significantly
Solution Approach 1:
The patent employs a sacrificial anode material that is consumed during operation to prevent coking on the catalyst. This disposable sacrificial component protects the catalyst from deactivation without requiring precious metals, resolving the contradiction between catalyst reliability and material cost
Solution Approach 2:
The electrochemical cell automatically generates the necessary chemical environment to prevent coking through ion transport and potential control, making the system self-regulating. This self-service mechanism maintains catalyst stability without requiring expensive precious metal coatings
3Productivity
If external power sources are used to enable electrochemical promotion of catalysis, then reaction kinetics are enhanced at low temperatures, but system complexity and cost increase
Solution Approach 1:
The patent merges the electrochemical power source and the catalytic reactor into a single integrated device. The solid electrolyte membrane serves both as a separator and as an active component in the electrochemical-catalytic process, eliminating the need for separate external power supplies and reducing system complexity
Solution Approach 2:
The electrochemical cell structure performs multiple functions simultaneously: it provides electrochemical promotion of catalysis, generates necessary chemical potentials, and enables product separation. This multi-functionality reduces the need for additional external equipment, addressing the device complexity issue
4Loss of energy
If internal reforming is implemented in SOFC anode to eliminate external reformer, then system size and mass are reduced, but reforming selectivity and efficiency decrease
Solution Approach 1:
The patent creates different local zones within the anode structure: one zone optimized for reforming reactions with appropriate catalyst composition and porosity, and another zone for electrochemical reactions. This spatial differentiation of local qualities allows both high selectivity and high efficiency in the integrated internal reforming process
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 catalyst effectively reforms hydrocarbons into syngas at temperatures between 450-650°C, minimizing nitrogen oxide production and coking, with high catalytic activity and no need for external electric current or steam, achieving high fuel conversion and hydrogen yield.
Implementation Method 1
an oxygen ion conducting support
Implementation Method 2
a sacrificial phase, which enables non-Faradaic electrochemical modification of catalytic activity
Implementation Method 3
The catalyst effectively reforms hydrocarbons into syngas
Data Source
AI summary
A method and system for the reduction of pollutant NOx gases from automobile exhaust, as well as a method of reforming hydrocarbons, using a self-sustaining catalyst comprising an ion conductive support, a dispersed cathodic phase, a dispersed anodic phase, and a dispersed sacrificial phase, and a method of forming the self-sustaining catalyst.