This title appears in the Scientific Report :
2023
Please use the identifier:
http://dx.doi.org/10.34734/FZJ-2023-03015 in citations.
Generation of Hydrogen from Steam Using Oxygen Membrane Reactors
Generation of Hydrogen from Steam Using Oxygen Membrane Reactors
Besides electrolysis, thermal splitting of H2O molecules in steam is a promising method for producing pure hydrogen. However, at moderate temperatures (800-1000 °C), the hydrogen component in steam is very low due to the reaction equilibrium strongly favouring the H2O side. To overcome this limitati...
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Personal Name(s): | Bittner, Kai (Corresponding author) |
---|---|
Büddefeld, Bernd / Margaritis, Nikolaos / Schulze-Küppers, Falk / Wolters, Jörg / Natour, Ghaleb | |
Contributing Institute: |
Zentralinstitut für Technologie; ZEA-1 |
Imprint: |
2023
|
DOI: |
10.34734/FZJ-2023-03015 |
Conference: | Aachen Hydrogen Colloquium 2023, Aachen (Germany), 2023-04-18 - 2023-04-19 |
Document Type: |
Poster |
Research Program: |
Power-based Fuels and Chemicals |
Link: |
OpenAccess |
Publikationsportal JuSER |
Besides electrolysis, thermal splitting of H2O molecules in steam is a promising method for producing pure hydrogen. However, at moderate temperatures (800-1000 °C), the hydrogen component in steam is very low due to the reaction equilibrium strongly favouring the H2O side. To overcome this limitation, researchers have been exploring ways to continuously remove the oxygen generated during the thermal splitting process using oxygen conducting membranes, resulting in a significant higher conversion of H2O.Driving force for oxygen transport through the membrane is an oxygen partial pressure gradient across the membrane. This can be achieved by a reducing gas, e.g. methane, which consumes the oxygen on one side of the membrane. This method allows the coupling of the water splitting process with a partial oxidation reaction, leading to the production of both pure hydrogen and synthesis gas. The synthesis gas can be further processed to produce other chemicals and fuels.In addition to methane, industrial waste gases may also be used to consume the oxygen on the low oxygen partial pressure side. Using these gases as feedstock for pure hydrogen production allows to recycle the waste gases into valuable chemicals, which is beneficial for the development of a sustainable industry.In this work a concept for a scalable oxygen membrane reactor is presented to increase the hydrogen production efficiency. Moreover, a mathematical model is developed to estimate hydrogen production, energy consumption, and the composition of the reducing gas at the reactor outlet. This model can be used to optimize the operating conditions of the reactor, such as temperature and flow rates, and to predict the performance of the reactor when using different reducing gases. |