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Increasingly stringent emission regulations within the diesel engine industry, particularly with regard to particulate matter and oxides of nitrogen, have led to the development of a number of aftertreatment control technologies. Most of these control technologies address either oxides of nitrogen (NOx) emissions or particulate matter (PM) emissions, but not both. Until now no technologies were available that simultaneously reduced both these pollutants. Ceryx Incorporated has developed a novel four-way converter for the simultaneous reduction of PM, NOx, CO, and HC from diesel engines. The Ceryx systems integrate diesel particulate filters (DPF's) and lean NOx catalysts (LNC's) in the core of a proprietary heat exchanger. The heat exchanger serves to “recycle” heat from exothermic reactions over the catalyst by transferring heat from the hot exit gases to the cooler inlet gases.