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A Big Step Forward Producing Hydrogen

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Newcastle University researchers have engineered a chemical reactor capable of producing hydrogen as a pure product stream. The reactor represents a ‘transformational’ step forward in the chemical industry. It is the first thermodynamically reversible chemical reactor capable of producing hydrogen.

The novel reactor, described in the academic journal Nature Chemistry, avoids mixing reactant gases by transferring oxygen between reactant streams via a solid state oxygen reservoir.

This reservoir is designed to remain close to equilibrium with the reacting gas streams as they follow their reaction trajectory and thus retains a ‘chemical memory’ of the conditions to which it has been exposed.

The result is that hydrogen is produced as a pure product stream, removing the need for costly separation of the final products.

Led by Newcastle University, UK, the research involved experts from the universities of Durham and Edinburgh and the European Synchrotron Radiation Facility in France, and was funded by the Engineering and Physical Sciences Research Council (EPSRC).

Professor Ian Metcalfe, lead author and Professor of Chemical Engineering at Newcastle University said, “Chemical changes are usually performed via mixed reactions whereby multiple reactants are mixed together and heated. But this leads to losses, incomplete conversion of reactants and a final mixture of products that need to be separated. With our Hydrogen Memory Reactor we can produce pure, separated products. You could call it the perfect reactor.”

Hydrogen is the most abundant element in the universe. Produced through the splitting of water molecules, the shift towards renewable energy has led to a rise in so-called ‘green hydrogen’.

Hydrogen is a clean reactant and useful energy store and can be used as a fuel to generate electricity and many hope it can be stored and transported via the gas networks.

All processes – be they chemical, mechanical or electrical – are thermodynamically irreversible, and are less efficient that they otherwise could be.

This means that in traditional chemical reactors when hydrogen is produced it needs to be separated from other products, a process which is both costly and often energy intensive.

In describing their new system, the team demonstrated a chemical reactor capable, for the first time, of approaching thermodynamically reversible operation.

Reacting water and carbon monoxide to generate hydrogen and carbon dioxide, the system also prevents carbon being carried into the hydrogen produce stream as carbon monoxide or carbon dioxide, thus avoiding contamination of the product.

‘Flipping’ the reservoir a bit like a switch, the team showed it is possible to reach high conversion in the system so that carbon dioxide and hydrogen are produced at either end of the reactor as pure products.

“Whereas conventional hydrogen production requires two reactors and a separation, our reactor accomplishes all the steps in one unit,” added Professor Metcalfe. “And while we demonstrate the concept with hydrogen, the memory reactor concept may also be applied to other processes.”

The press release shows us a team well worth congratulating for an idea now executed to real world action. Prototypes and scale research to come. The “whoa for minute” hinges on just where all that carbon monoxide is going to come from and then making use of what could be a huge amount of carbon dioxide.

This is a great idea, but there is a long way to go. Combustion yielding CO isn’t usually the most efficient, but replacing a catalytic converter that makes CO2 from CO like what is under our cars with one making free hydrogen just might make a big difference in fuel supply extension.


Source: https://newenergyandfuel.com/http:/newenergyandfuel/com/2019/05/29/a-big-step-forward-producing-hydrogen/


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