The science is difficult for a layperson (such as myself) to pick apart, but the above-mentioned publications page[0] links directly to at least one paper[1] which contains some promising detail.

[0] https://www.hb11.energy/news-and-publications [1] https://aca3d9dd-3b9c-446b-8797-0ba1cdb49ccb.filesusr.com/ug...