What is it?
Methane is synthesised directly from steam and carbon dioxide gas in a solid oxide electrolysis cell at elevated temperatures.
Why is it important?
Methane can be synthesised directly from water and carbon dioxide, without requiring a precursory hydrogen production step. This reduces system complexity and could yield energy savings.
- Volumetric hydrogen density: Liquid state = ~100kg H2/m3. At standard temperature and pressure = 0.7946g/100L
- Gravimetric hydrogen density: ~25% H2 by weight
- Storage conditions: 90 to 120 bar
- Single reactor means reduced system complexity and lower associated capital costs
- Allows integration of waste heat streams, reducing the required energy input
- Makes use of carbon dioxide as a process input
- Balancing reactor temperature is a challenge. Methane product decomposition occurs at typical solid oxide cell operating temperature
- Improve catalyst selectivity
- Develop cell designs and electrolytes capable of operating at thermodynamically favourable conditions
- Understand fundamental reaction mechanisms
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