The emission footprint of blue hydrogen production varies in literature, resulting in opposing recommendations on its eligibility in a carbon-neutral energy system. Next to fugitive methane emissions and global warming potential, the assumptions regarding carbon capture (CC) can significantly influence results. This analysis reviews these assumptions of several recently published blue hydrogen studies and compares them to experiences with CC in practice. It is found that the impact of various CC modelling parameters on emission footprints requires using real-world data in emission accounting. It is necessary to establish a concise emission accounting methodology for CC to increase transparency for stakeholders on blue hydrogen emissions.
Keywords Carbon capture, blue hydrogen, low carbon technologies, steam methane reforming, autothermal reforming