Abstract: An aftertreatment system for treating exhaust gas discharged from a combustion engine, the aftertreatment system comprising a low temperature selective-catalytic-reduction catalyst, wherein the low-temperature selective-catalytic-reduction catalyst is a mixture of catalytic metals provided on a beta-zeolite support material, the mixture of catalytic metals being at least one mixture selected from Cu and Ce, Mn and Ce, Mn and Fe, Cu and W, Mn and W, and Ce and W.