Developing hydrogen fuel from iron-rich rocks

This process, sometimes referred to as blue hydrogen production, remains a contributor to greenhouse gas emissions alongside traditional fossil fuel use. Natural catalysts like nickel and platinum group elements are being explored as catalysts to induce this process.Natural accumulations of geologic hydrogen are being found all over the world, but in most cases they are small and not economical, although exploration continues, said Esti Ukar, a research associate professor, UT Austin.Ukar said the research will test generating larger volumes of hydrogen from iron-rich rocks that would normally take several million years to naturally occur. The team is performing accelerated underground testing to better our understanding of the chemical reactions that produce hydrogen naturally.If we can accelerate these reactions underground, we can turn rocks into a clean and abundant energy resource, said Eric Ellison, research scientist at CU Boulder.A 2022 report from the U.S. Geological Survey (USGS) suggested there may be enough naturally occurring geologic hydrogen to meet global demand for generations, potentially offering a rapid replacement for harmful carbon-emitting fossil fuels.Using a conservative range of input values, the model predicts a mean volume of hydrogen that could supply the projected global hydrogen demand for thousands of years, said USGS researcher Geoffrey Ellis. Based on what we know about the distribution of petroleum and other gases in the subsurface, most of this hydrogen is probably inaccessible.Ellis research showed that much of this hydrogen supply is too deeply buried or too far offshore to be economically recovered.And while USGS said even a fraction of the Earths geological hydrogen resources could serve global liquid fuel demand for hundreds of years, relying on fuels that require natural processes that take millions of years may pose its own challenges. Extractive natural fuels are not part of a long-term circular economy, a vision pursued by the National Renewable Energy Laboratory (NREL).Decarbonization of the U.S. economy will require rapid deployment of clean energy technologies, said NREL.