HKUST-1 catalysts were impregnated with vanadium, niobium and manganese species and tested in NH 3-SCR for NO removal. No reduction of NO by NH 3 was registered for the unmodified HKUST-1 and disappearance of NO was attributed to adsorption. After a pretreatment at 185°C, the best catalytic performance was found for HKUST-1-Mn with 100% and 80% conversion of NH 3 and NO, respectively at 185°C. For the first time, the H 2 O tolerance was examined on the modified HKUST-1 catalyst. The addition of water vapor resulted in decrease of NO and NH 3 conversions, which was immediately recovered when H 2 O feeding was stopped. The NO conversion dropped from 76% to 68% after 35 min of H 2 O addition.