System and method for reducing emission from a combustion engine

A combustion engine system (10) comprises a plurality of cylinders (30) configured to combust a mixed fuel (16) to produce an exhaust gas (34) and at least one reforming cylinder (24) configured to receive a first portion of a fuel (22) and deliver a reformed hydrogen-containing gas (26). The hydrogen-containing gas (26) is introduced into a second portion of the fuel (14) to form the mixed fuel (16) to reduce emission from the combustion engine system (10).