Abstract In the present work, Cr (III), Co(II) and Hg(I) doped dolomite are employed as H2S capture agents. The X-ray diffractions pattern shows that nor the doping process neither the H2S capture have affected the nanostructure of dolomite. The gravimetric obtained results for hydrogen sulfide capture are: 2.4 mg/g (DOL-Cr), 8.8 mg/g (DOL-Co), and 2.4 mg/g(DOL-Hg). The un-doped dolomite exhibits a H2S capture capacity of only 0.4 mg/g. The FTIR results suggest that the higher H2S capture capacity of the cobalt-doped sample, could be related with the presence of pre-adsorbed water molecules.