HT-PEM Electrochemical Hydrogen Pump for CO-Rich Gas Separation
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Solution Overview
Problem
Conventional hydrogen separation techniques are complex and inefficient, especially when dealing with gas mixtures containing carbon monoxide, as they require multiple unit operations and are not effective at high temperatures, limiting the ability to purify and compress hydrogen to high pressures.
Innovation Solution
The development of an electrochemical hydrogen pump using a high-temperature polymer electrolyte membrane (HT-PEM) with phosphonic acid ionomer binders that operate at elevated temperatures (160-220°C), allowing for the simultaneous separation and compression of hydrogen from gas mixtures with high CO content, including syngas and water gas shift reactor effluents, achieving high hydrogen purity and recovery rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional hydrogen separation techniques are used, then hydrogen can be separated, but the process becomes complex and inefficient, requiring multiple unit operations
Solution Approach 1:
The patent combines multiple hydrogen separation functions into a single electrochemical cell that simultaneously performs separation, purification, and compression. The membrane electrode assembly integrates the electrolyte membrane, catalyst layers, and gas diffusion layers into one unified structure that accomplishes what previously required multiple separate unit operations.
Solution Approach 2:
The electrochemical hydrogen pump serves multiple functions simultaneously: it separates hydrogen from gas mixtures, purifies the hydrogen to high purity levels, and compresses the separated hydrogen to high pressures. This multi-functional device replaces what would traditionally require separate separation units, purification columns, and compression systems.
2Reliability
If conventional techniques are used for gas mixtures with CO, then separation can occur, but effectiveness decreases at high temperatures
Solution Approach 1:
The patent employs high-temperature operation (100-200°C) to enhance the electrochemical reactions and improve CO tolerance. By operating at elevated temperatures, the system achieves better hydrogen separation effectiveness and maintains high hydrogen purity even in the presence of significant CO concentrations in the feed gas.
Solution Approach 2:
The system uses composite materials including the electrolyte membrane, ionomer binders, and catalyst particles that are specifically designed to function effectively at high temperatures. The catalyst layers contain platinum or palladium on carbon supports that maintain activity and CO tolerance at elevated temperatures, enabling reliable hydrogen purification from CO-containing streams.
3Productivity
If high pressure compression is achieved, then hydrogen productivity increases, but system complexity and energy consumption increase
Solution Approach 1:
The electrochemical cell uses electrical energy input to drive the separation and compression process. By applying an external voltage, the system actively pumps hydrogen through the membrane and compresses it to high pressures without requiring complex mechanical compression systems. The electrical energy directly enables both separation and compression functions.
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 HT-PEM electrochemical hydrogen pump achieves 99.3% hydrogen purity and greater than 85% recovery rate from gas mixtures with 25-40% CO content, maintaining stability and performance over 100 hours at 200°C, significantly improving hydrogen separation efficiency and tolerance to contaminants.
Implementation Method 1
the binders hold the electrocatalyst/electrocatalyst supports, while also delivering protons to and from the electrocatalyst to the PEM separator
Implementation Method 2
electrochemical hydrogen pump... generating hydrogen gas... achieving high hydrogen purity and recovery rates
Implementation Method 3
the first substrate has the characteristic of a porous gas diffusion layer that is conductive and serves as an anode
Data Source
AI summary
The present disclosure provides for electrochemical hydrogen pumps and methods of producing hydrogen. Embodiments provide for efficient and high yielding electrochemical hydrogen pumps that can operate at high temperatures here other pumps cannot operate effectively and an electrochemical hydrogen pump that can purify hydrogen from gas mixtures with large carbon monoxide compositions as other electrochemical hydrogen pumps technology cannot operate effectively with carbon monoxide in the gas mixture.