ALDEHYDE EMISSIONS FROM TWO-STROKE AND FOUR-STROKE SPARK IGNITION ENGINES WITH CATALYTIC CONVERTER RUNING ON GASOHOL

Rad donosi rezultate ispitivanja emisije aldehida iz dvotaktnog i četverotaktnog jednocilindričnog motora na paljenje svjećicama koji koristi mješavinu benzina (80 vol. %) i alkohola (20 vol.); motor je prevučen bakrom (sloj debljine 300 μm na klipu i na unutarnjoj strani glave cilindra) i opremljen katalizatorom od spužvastog željeza. Rezultati su uspoređeni s konvencionalnim benzinskim motorom na paljenje svjećicama. Motor prevučen bakrom pokazuje smanjenje emisije aldehida u odnosu na konvencionalni motor za oba ispitna goriva. Katalitički pretvornik s ubrizgavanjem zraka značajno smanjuje štetne emisije kod oba ispitna goriva i kod obje konfiguracije motora.This paper reports aldehyde emissions from two-stroke and four-stroke, single cylinder spark ignition (SI) engines with gasohol (80 vol. % gasoline, 20 vol. % ethanol) having copper coated engine (copper-coated thickness, 300 μm) on piston crown and inner side of cylinder head) provided with catalytic converter with sponge iron as catalyst and compared with conventional SI engine with gasoline operation. Copper-coated engine showed reduction in aldehyde emissions when compared with conventional engine with both test fuels. Catalytic converter with air injection significantly reduced emissions with both test fuels on both configurations of the engine