This paper presents a unique system approach applied in a joint academic - industrial research program, E4 Mistra, to reach the goals of energy efficiency and low emissions exhaust aftertreatment system for heavy duty vehicles. The high energy efficiency is achieved by heat recuperation, on-board hydrogen production for use in both an auxiliary power unit and for NO_x reduction and by finding new solutions for making the after-treatment system active at low exhaust temperatures. To reach low paniculate emissions a mechanical filter using a sintered metal filter is developed. Low NO_x emissions are achieved by an efficient NO_x reduction catalyst. The system is based on four technological advances: Thermoelectric material s for heat recuperation, catalytic reduction of NO_x over innovative catalyst substrates using hydrocarbons from the fuel and H_2 from a high efficiency fuel reformer, and particulate filtration over a porous metal filter.
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