dhiziri catalyst
A catalytic converter chishandiso chinoshandiswa kudzikisa kuburitswa kwezvinhu zvinokuvadza mumagasi emhepo uye inoshandiswawo muinjini dzedhiziri.
Kweanopfuura makore makumi maviri, vagadziri vemota vanga vachishandisa catalytic converter mumasisitimu emhepo einjini dzepeturu. Sezvo catalytic converter iri mudziyo unoshandiswa kudzikisa kubuda kwezvinhu zvinokuvadza kuita magasi emhepo, inoshandiswawo mumainjini edhiziri. 
Injini yedhiziri inoburitsa soot, hydrocarbons, sulfur dioxide, nitrogen oxides uye simbi: calcium, magnesium, iron uye zinc nekuda kweiyo musimboti wekushanda uye mafuta anoshandiswa. Mushonga weoxidation unoshandiswa zvakanyanya unogona kuderedza kuburitswa kwesarufa dioxide ne98 muzana, hydrocarbon uye carbon monoxide emissions inodarika 80 muzana.
Iyo Euro IV standard yanga ichishanda kubvira 2005. Mumagadzirirwo emagetsi einjini dzedhiziri, kuisirwa kwezvinokonzeresa uye chidimbu chesefa kuchave kuri madikanwa, pamwe inowedzerwa catalyst ichawedzerwa kuita neutralize nitrogen oxides.
