Safe H2 Storage II - Sicheres, druckloses, flüssiges Speichersystem für Wasserstoff bei Raumtemperatur

Project: Research project

Description

The project safe hydrogen storage II is based on the results of the project safe hydrogen
storage (2nd call A3 program). It is the aim to develop an enhanced hydrogen storage system
with considerable increased storage capacity.
The results of the first project already showed the positive technical and economical feasibility
for this innovative, liquid, non-pressurised, non-cryogen and very safe hydrogen storage
system, based on ionic liquids. The developed storage density of 2,0 mass% is not sufficient
and therefore should be increased significantly. To achieve that, different approaches shall be
verified and combined with each other: First the molecular mass of the basic ionic liquid shall
be decreased to expand the free space for the hydrogen itself. This can be achieved solely
by structural variation of the quaternary ammonium or imidazolium cation, since the anion BH4
- cannot be optimized any more. A decrease of the cations mass will be done by shortening of
the alkyl side chains, which causes doubtlessly an increase of melting point and viscosity due
to higher symmetry. To overcome that, cations shall be investigated, which carry shorter and
additionally branched or unsaturated or ether-functionalized alkyl side chains. This is known to
show the desired effect in analogous structures. It shall be investigated as well, if mixtures of
such isomers or derivates will result in even lower melting points and viscosities, as generally
known from mixtures of substances compared to pure substances, e.g. eutectic mixtures.
An important part of the formulation of the hydrogen storage is the adjustment of the viscosity
and the melting point using an additive. This additive usually consists out of a high boiling,
molecular compound. It shall now be a goal, to reduce the needed amount of such additives
used so far: Increasing the solvation strength by adding polar groups on the one hand and
decreasing the viscosity by chemical variation (branched side chains, ether-groups, mixtures)
on the other hand shall reduce the amount significantly.
To reach these aims proionic GmbH will first start an extensive inquiry regarding industrial
available starting materials like tertiary amines or alkylimidazoles and order samples of this
materials. Since it is obvious not to find many of adequate commercially available starting
materials, the partner TU-Graz, Inst. of org. Chemistry, will synthesise and characterise most
of these materials, which by then will be converted into the hydrogen storage by the partner
proionic GmbH, using their patented CBILS-route. Proionic will characterise the storage
similar to the first project Safe hydrogen storage, except the thermal stability. This will be
done by the partner Montanuni Leoben, Inst. of process engineering and environmental
protection (VTIU) by the approved method used so far, using thermogravimetry, differential
scanning calorimetry, infrared spectroscopy and mass spectroscopy.
The one to two best-evaluated storage media will then be investigated regarding recyclability,
kinetic of hydrogen release and quality of hydrogen and estimated regarding HSE (Health,
Security and Envirnonment) data. At least OMV will verify the economic efficiency compared
to the results from the first project Safe Hydrogen Storage. In summary the expected results
of this project will be a significant increase of the hydrogen storage capacity and the
corresponding technical and economical data of the new system.
The project will focus at any time on feasible industrial production conditions for a future
production in large scale. This hydrogen storage with a competitive storage capacity will show
a number of benefits compared to the state of the art: It is non pressurized, therefore it works
at ambient conditions. It is non cryogen and doesnt need to be cooled at all. It stores the
hydrogen chemically and releases just the amount of hydrogen needed for an application at
its operating conditions via the catalysis-cell: For that reason there is only as little as possible
free and dangerous hydrogen present, which maximizes safety. It is liquid and can be pumped
similar to conventional fuels. Compared to high pressure or cryo-systems, the tank material is
very simple, cheap and of low weight: This increases the system storage density and causes a
simple and cheap transport and supply chain, comparable to the ones used for conventional
fuels. Last but not least, there is no loss by boil off like in cryo-systems and there is less
energy consumption, because no liquefaction at very low temperatures or compression to very
high pressure is needed.
StatusFinished
Effective start/end date1/12/0930/11/10