A process for treating gaseous effluents developed in a coffee roasting installation making it possible to treat gaseous effluents developed in a coffee roasting installation, in which the effluents are passed through an oxidative catalytic converter. Within the catalytic converter use is made of a catalyst selected from the group including: a) a catalyst including a porous faujasite support containing copper oxide nanoparticles in a quantity of between 2% and 7% of the total weight of the catalyst； b) a catalyst including a porous γ-alumina support containing copper oxide nanoparticles in a quantity of between 2% and 7% of the total weight of the catalyst； and c) a catalyst including a mesoporous zeolite or silica support containing iron nanoparticles in a quantity of between 2% and 7% of the total weight of the catalyst.
