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Diesel Selective Catalytic Reduction (SCR) wata fasahar sarrafa hayaki ce mai inganci don rage nitrogen oxides daga injin diesel. Babban aikin SCR shine canza NOx mai cutarwa zuwa nitrogen mai tsabta da tururin ruwa, wanda ya dace da tsauraran dokokin muhalli. Abubuwan fasaha na SCR sun haɗa da wani katalista wanda aka rufe da zinariya mai daraja da kuma shigar da shi, a matsayin mai rage ruwa (yawanci urea), cikin hanyar fitarwa. Wannan tsari yana faruwa ne kawai a cikin takamaiman yanayin zafi, don tabbatar da ingancin canji mafi girma. Tsarin fasahar SCR an dade ana amfani da su a cikin nau'ikan aikace-aikace da dama, kamar manyan motoci, bas, da injinan masana'antu. Yana wakiltar wani muhimmin ɓangare na ƙoƙarin sanya injin diesel su zama masu tsabta da kuma dorewa.