DEF is an aqueous solution that is 32.5% urea and 67.5% deionized water. It is a consumable used to operate SCR converters in motor vehicles with diesel engines. Selective catalytic reducers (SCR) are ...

including Selective Catalytic Reduction (SCR) and Diesel Oxidation Catalyst (DOC) systems. Paôlla’s work tackles the complexities of modeling catalytic processes affected by mass transfer limitations.