A series of promoted Pd catalysts supported on a mixed gamma-Al2O3-TiO2 support was prepared for use in selective catalytic reduction (SCR) of nitrogen oxides (NOx) using hydrogen rich syngas as a reductant. The catalysts, containing Pd, Fe, Co and K incorporated through incipient wetness, were characterized in terms of surface area, elemental composition and crystalline chemical phase. The NO reduction (DeNO(x),) activity of the catalyst series was measured as a function of temperature in a flow reactor system fed with a simulated diesel engine exhaust. The catalyst series shows high NOx conversion and favorable selectivity to N-2 over a wide range of temperature compared to results on similar catalyst systems reported to date. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.