OSOD H2 Generator Inside (IMAGE) Graz University of Technology Caption The inner workings of the OSOD H2 generator. The blue cuboid is the core development: a gas furnace with four tubular reactors in which the chemical looping process for hydrogen production takes place. Credit © RGH2 Usage Restrictions free of charge for editorial purposes. The use of the photos is only permitted provided that the source is cited in full together with TU Graz. The use of the photos for advertising purposes by institutions not affiliated with TU Graz is only possible upon request. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.