The Impact Of Platinum-Rhodium Active Coating Inside A Self-Ignition Engine On Volatile Organic Compounds (Voc's) Emission

This paper presents the results of the researches on platinum-rhodium inner catalyst application in self-ignition engine (SB 3.1). A main aim of this study was volatile organic compounds (VOC’s) marking in exhaust gases. Platinum and rhodium was used as an active coating. The catalyst was put onto the engine valves surface. As a catalyst support a zirconium ceramic was used. The ceramic layer was also used as a local thermal barrier. The results of the experiment was VOC’s quantity-quantitative analysis in function of chosen points of the engine work. The results shows that platinum-rhodium active coating inside of the diesel engine caused about tenfold total VOC’s concentration decrease. Because of significant toxicity of benzene and formaldehyde, for those compounds separate comparison analysis was done. Decrease of benzene concentration was also observed but catalyst effectiveness was lower than for total VOC’s concentration. The results of analysis of the catalyst influence on formaldehyde concentration in exhaust are ambiguous.