A fuel reformer is operated in one mode of operation to generate and supply a particular quantity and/or composition of reformate gas to a first component such as a NO_X trap, and then is operated in a different mode of operation to generate and supply and different quantity and/or composition of reformate gas to a different component such as a soot particulate filter. In a similar manner, the fuel reformer is operated in one mode of operation to generate and supply a particular quantity and/or composition of reformate gas to a fuel cell, and then is operated in a different mode of operation to generate and supply and different quantity and/or composition of reformate gas to an emission abatement device. A method of operating a fuel reformer is also disclosed.