diesel catalyst
Catalytic converter ke sesebelisoa se sebelisetsoang ho fokotsa ho ntšoa ha likarolo tse kotsi ho ligase tsa mouoane hape se sebelisoa lienjineng tsa diesel.
Ka lilemo tse fetang 20, baetsi ba likoloi ba 'nile ba sebelisa li-converter tsa catalytic tsamaisong ea ho ntša metsi ea lienjineri tsa peterole. Kaha catalytic converter ke sesebelisoa se sebelisetsoang ho fokotsa ho ntšoa ha likarolo tse kotsi hore e be likhase tsa mouoane, e boetse e sebelisoa lienjineng tsa diesel. 
Enjene ea diesel e ntša soot, hydrocarbons, sulfur dioxide, nitrogen oxides le metals: calcium, magnesium, iron le zinki ka lebaka la molao-motheo oa ts'ebetso le mafura a sebelisoang. Sehlahisoa se sebelisoang haholo sa oxidation se ka fokotsa tlhahiso ea sulphur dioxide ka liperesente tse 98, tlhahiso ea hydrocarbon le carbon monoxide ka liperesente tse fetang 80.
Tekanyetso ea Euro IV esale e sebetsa ho tloha 2005. Litsamaisong tsa mouoane oa lienjine tsa diesel, ho kengoa li-catalyst le filthara ea particulate e tla ba tlhokahalo, mohlomong ho tla eketsoa mokelikeli o eketsehileng ho fokotsa nitrogen oxides.
