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Synthetic natural gas from excess electricity
Date:1/6/2014

The methanation process uses CO2, for example from biogas production, and this combined with hydrogen (H2) from excess renewable electricity, produces methane, which can not only be distributed simply and cost-effectively in the natural gas network, but can also be stored for longer periods of time. This means renewable energy is being used to produce a "quasi-fossil" fuel the basic principle of "power to gas".

The Sabatier reaction, which produces combustible methane from hydrogen and CO2, has been known for a long time. Now researchers in the Empa "Hydrogen and Energy" Department have succeeded in greatly optimising the process. A catalyst is required to bring about the reaction of CO2 with hydrogen using as little energy as possible; this catalyst can, for example, be made of nickel. The gas molecules react more easily with each other on the surface of such a catalyst, reducing the energy required for the reaction to take place. This is referred to as sorption catalysis. Empa researcher, Andreas Borgschulte, and his team have now combined a nanoscale nickel catalyst with a zeolite. Zeolites are crystalline aluminosilicates with the ability to absorb water molecules and release them again when heated.

The principle is simple: the chemical reaction of hydrogen with CO2 produces not only methane (CH4), but also water (H2O). The researchers use the hygroscopic (i.e. water-binding) property of the zeolite to remove the resulting water from the reaction mixture. The chemical equilibrium then moves towards methane. Result: a higher yield of pure methane and a more efficient catalytic process. As soon as the zeolite is saturated with water, it can be "unloaded" again by heating and evaporation of the water, and is then re-used.

Project partners sought

The process works though currently only in the laboratory. According to Borgschulte, there is still a long way to go before it is ready for commercial exploitation in large plants. Empa resea
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Contact: Cornelia Zogg
cornelia.zogg@empa.ch
41-587-654-599
Swiss Federal Laboratories for Materials Science and Technology (EMPA)
Source:Eurekalert  

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