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Liquid organic hydrogen carriers made of siloxane ionic liquids are employed. Organosilicon linkers were used to lower the melting points of ionic liquids. Ionic liquids were hydrogenated and then dehydrogenated on a Pd/C catalyst. Thermal stability of ionic liquids is at least 220 °C.
As liquid organic hydrogen carriers, novel ionic liquid architectures have been researched. For the first time, an organosilicon compound with a carbazole fragment underwent hydrogenation. In the composition of the hydrogen carrier based on organosilicon moieties, it was discovered that the N-(CH2)3-Si fragment was more suited than the N-CH2-Si link.
For the first time, ionic liquids with a carbazole fragment containing silicon atoms were created. By adding an organosilicon linker between carbazole nitrogen and imidazolium ion, it was feasible to dramatically lower the melting point of such ionic liquids.
Global siloxane liquid carrier for hydrogen market accounted for $XX Billion in 2022 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2023 to 2030.
A siloxane liquid carrier for hydrogen is being developed by HySiLabs in France. Equinor Ventures is leading the million Series A financing, which also includes the European Innovation Council Fund, EDP Ventures, and PLD Automobile, as well as previous investors Kreaxi, Région Sud Investissement, and CAAP Création. The money will help the technology’s ongoing development.
The production of liquid siloxane hydrogen carrier compounds from silica and/or silicate requires only hydrogen, water, silicon, oxygen, and/or hydrogen as additional reactant and can be done with little to no carbon emissions.
Early experiments have demonstrated the stability of the carrier, known as Hydrosil, and its ability to be carried and stored in existing infrastructure under circumstances of ambient pressure and temperature. On demand hydrogen release is possible. Two cutting-edge chemical techniques have been created by HySiLabs to charge and discharge H2 into and out of the carrier.
The fundamental issue of how to transport and store hydrogen at scale safely, affordably, and efficiently may be addressed by HySiLabs’ patented method. Importantly, in contrast to recently proposed liquid organic hydrogen carrier (LOHC) solutions, HySiLabs’ molecule requires energy to lock hydrogen into the carrier but none to release it.
