Biofuel Effect on Regeneration Capability and Soot Reactivity in SCRoF Systems

Biodiesel, a renewable alternative to conventional diesel fuel, offers similar combustion characteristics but with reduced carbon emissions on a well-to-wheel basis. However, biodiesel combustion still generates hydrocarbon (HC), carbon monoxide (CO), nitrogen oxides (NOx), and particulate matter (PM). Modern diesel aftertreatment systems—comprised of a Diesel Oxidation Catalyst (DOC) and a Selective Catalytic Reduction on Filter (SCRoF)—are essential to comply with stringent emission standards. This study investigates the effects of biodiesel (B100) versus conventional diesel (B7) on soot reactivity and regeneration capability of an SCRoF system in a heavy-duty application. Particular attention is paid to how fuel aging impacts emission stability and the ability to manage particulate and NOx formation. The findings highlight that although B100 can improve certain aspects of HC oxidation and soot reactivity, its lower energy content and unique chemical properties require tailored aftertreatment strategies to optimize overall emissions performance and maintain compliance with evolving regulatory requirements..