Project Name: GreenH2Pipes

Location: Spain
Project Pillar: Renewable energy and CO₂ management


The aim of this project is to study the possibilities for improving the processes and operations for green hydrogen generation via PEM electrolysis and the optimisation of its storage and transport based on organic liquids and injection into the natural gas network.


The consortium comprises 8 companies (AMES, Estamp, Enagás, Exolum, H2Greem, H2Site, Nano4Energy and Rovalma) and 6 research centres (CEIT, Centro Nacional de Hidrógeno–CNH2, CSIC, ITECAM, Tekniker and Rovira i Virgili-URV University).

The project consists of three different lines of action covering the whole hydrogen value chain: from hydrogen generation to its subsequent injection, transportation and storage.


Research into new materials, designs and manufacturing processes for the development of new components to enable the manufacture of a new generation of technically and economically competitive PEM electrolysers based on Spanish technology.


  • Research into new catalysers and carriers based on organic liquids, reducing the energy required for the loading and unloading process, increasing the efficiency of the cycle and useful life, demonstrating the technical and economic viability of the storage of hydrogen in organic liquid form.
  • Research into the behaviour of materials, gas flows with different concentrations of hydrogen and membranes for the separation of gases that demonstrate the technical and economic viability of injecting hydrogen into the natural gas network.


The specific aims of Exolum in the Green H2 Pipes project are focused on research into new catalysing materials to improve the processes involved in the storage of H2 in organic liquid form, which reduce the energy used in loading and unloading and increase the useful life of systems to achieve the technical and economic viability of these storage systems.


Specifically, the aim is to develop a laboratory-scale prototype of a complete hydrogenation / dehydrogenation system with gravimetric storage capacity of over 7 wt. %.


To this end, a study will be undertaken of different organic liquids, catalysers and the most suitable operating conditions to lower the cost of the LOHC (Liquid Organic Hydrogen carriers) system, reducing the energy used in loading and unloading processes and increasing the efficiency of the cycle and useful life. The prototype LOHCs obtained and validated will enable a technical-economic study to be conducted to demonstrate that the storage of H2 in organic liquid form will allow the existing liquid fuel infrastructure to be used to transport H2.


This project is subsidised by the Centre for the Development of Industrial Technology (CDTI) as part of the MISIONES 2021 programme with the support of the Spanish Ministry of Science and Innovation. Financed by the European Union – NextGenerationEU. The Misiones programme is part of the State Plan for Scientific and Technical Research and Innovation 2021-2023.

STATUS: In operation
INVESTMENT: €750,401