[en] Studying the behaviour of the two thermally stimulated exoelectron emission (TSEE) maxima of BeO ceramics at about 270 and 325 ⁰C it can be shown that the TSEE maximum at 270 ⁰C is closely connected with adsorption and desorption processes occurring on the surface of the samples. In particular, this TSEE maximum is strongly influenced by the donor-like behaviour of adsorbed hydrogen on the dehydrated surface of the BeO ceramics. The detailed surface processes leading to the appearance of the TSEE-maximum at 270 ⁰C are discussed. (author)