Aspen Products Group, Inc. is developing a catalytically active filter designed for continuous removal of particulate matter from diesel engine exhaust systems. Our technology offers the potential for reduced operating cost and emissions relative to conventional diesel particulate filters. The technology effectively traps ultrafine soot particles and continually oxidizes them to carbon dioxide using oxygen contained within the exhaust. No special exhaust concentrations or temperature excursions are needed to operate the process.

At the core of APG’s technology is a uniquely structured, highly active, and precious metal free soot oxidation catalyst. The catalyst is formed into thin, porous layers of nano- and micro– sized fibers. The physical structure of the catalyst promotes trapping of soot. When in contact with the catalyst fibers and at normal exhaust system temperatures, combustion of the soot occurs. Oxidation of particulates has been shown to occur at exhaust temperatures normally seen in long-haul trucks. Ongoing development is focused on reducing the temperature needed for high activity to apply to all vehicle uses. The particulate filter has shown high filter efficiency at low pressure drop.