Effect of Au/CeO2 as fuel borne catalysts on performance, combustion and emissions characteristics of CI engine

Abstract

Doping the fuel with fuel-borne catalysts is an economical and inventive option for reducing the emissions from conventional fuel. The present investigation explores the effect of Au/CeO 2 doping in diesel fuel on combustion and emission characteristics of the compression ignition (CI) engine. Experiments were performed on a direct injection four-stroke water-cooled diesel engine (Kirloskar TV1) at varying engine loads. Results indicated that Au/CeO 2 doped diesel enhanced the combustion process and progressively increased the in-cylinder pressure at each tested load condition. Au/CeO 2 doped diesel fuel was found to be effective in reducing NO and hydrocarbon emissions. The particulate number concentration was decreased in nucleation mode while it increased in accumulation mode with Au/CeO 2 doped diesel fuel. • Effect of doping of Au/CeO 2 in diesel fuel as Fuel-Borne Catalyst (FBC) on combustion characteristics. • Combustion characteristics were boosted with FBC doped diesel due to secondary atomization. • Redox property of FBC doped diesel fuel helps to reduce the NO and hydrocarbon emissions compared to diesel fuel. • FBC doped diesel fuel reduced particulate number concentration in nucleation mode. • FBC increased particulate number concentration in accumulation mode.