ʻO ka catalytic converter ka mea nui loa o ka hoʻomaʻemaʻe waho i hoʻokomo ʻia i loko o ka ʻōnaehana exhaust, hiki ke hoʻohuli i nā kinoea ʻino e like me CO, HC a me NOx mai ke kinoea hoʻopau i loko o ka carbon dioxide, ka wai a me ka nitrogen ma o ka oxidation a me ka hōʻemi.Ke hele ka kinoea huelo kiʻekiʻe i ka hui hoʻomaʻemaʻe, e hoʻomaikaʻi ka mea hoʻomaʻemaʻe i ka catalyst i ka hana o CO, HC a me NOx a hoʻoikaika iā lākou e hoʻokō i kahi hopena hoʻohaʻahaʻa hoʻohaʻahaʻa oxidation, kahi e hoʻoheheʻe ʻia ai ka CO i kala ʻole a kinoea kalapona ʻawaʻawa ʻole i ka wela kiʻekiʻe;Hoʻopili ʻia nā pūhui HC i ka wai (H20) a me carbon dioxide ma nā wela kiʻekiʻe;Hoʻemi ʻia ka NOx i ka nitrogen a me ka oxygen.ʻO nā kinoea kino ʻekolu e lilo i kinoea kino ʻole, i hiki ke hoʻomaʻemaʻe ʻia ke kinoea huelo.
ʻO ka ʻāpana lawe o ka catalyst he ʻāpana o nā mea seramika porous, i hoʻokomo ʻia i loko o ka paipu hoʻopau kūikawā.Kapa ʻia ʻo ia he mea lawe no ka mea ʻaʻole ia e komo i nā hopena catalytic, akā ua uhi ʻia me ka platinum, rhodium, palladium a me nā metala makamae ʻē aʻe.Hiki iā ia ke hoʻololi i ka HC a me CO i loko o ke kinoea hoʻopau i loko o ka wai a me CO2, a decompose NOx i nitrogen a me ka oxygen.ʻO HC a me CO nā kinoea ʻawaʻawa.ʻO ka inhalation nui e alakaʻi i ka make, aʻo NOX e alakaʻi pololei i ka smog photochemical.
Ma lalo o ke kūlana hana maʻamau o ka catalytic converter, ma muli o ka nui o ka wela wela i hana ʻia e ka hopena oxidation, hiki ke hoʻokolokolo ʻia ka hana o ka catalytic converter e ka hoʻohālikelike ʻokoʻa wela.ʻO ka mahana puka o ka catalytic converter ma kahi o 10 ~ 15% kiʻekiʻe ma mua o ka wela inlet.No ka nui o nā mea hoʻololi catalytic maʻamau, ʻo ka wela o ka puka o ka catalytic converter e 20 ~ 25% kiʻekiʻe ma mua o ka wela inlet.
ʻO ka honeycomb metala substrate catalyst nā mea maikaʻi o ka puhi wikiwiki, ka leo liʻiliʻi, ka ikaika mechanical kiʻekiʻe, ke kūpaʻa wela nui, a me nā mea ʻē aʻe.Hiki iā mākou ke hoʻokō i ka maʻamau emission Euro II, Euro III, Euro IV, Euro V, EPA a me CARB.