A reactor configured to release hydrogen from a hydrogen-bearing, liquid compound, having a reactor vessel which comprises at least one body with metallic support structure. A solid, highly porous coating is applied on said at least one body which comprises catalytically acting substances for the release of hydrogen from the liquid, hydrogen-bearing compound, wherein the at least one body with metallic support structure comprises at least one cutout with a volume that remains the same or becomes larger from along a cross-sectional dimension extending from bottom to top, based on the reactor vessel.