This study evaluates the outcomes of antioxidants and nanoparticles as additives with biodiesel diesel blends on the engine working characteristics, carried on a single cylinder direct injection (DI) diesel engine, operated at invariable engine speed of 1500 rpm, invariable injection timing of 26 deg before top dead center with invariable injection pressure of 216 bar, under five different engine load conditions (0.08, 0.15, 0.23, 0.30, 0.45, and 0.53 MPa). The antioxidants and nanoparticles blended test fuels are used as fuels in this experimental investigation. The antioxidant as additive in fuel found to be more effective in suppressing the NO emission by disrupting the chain propagating reactions, trapping free radicals, and decomposing peroxides. The high surface area to volume of the nanoparticles acts as fuel borne catalyst by ameliorating the engine working characteristics and downplays the NO emission by buffering the oxygen molecule. The obtained experimental results indicates that B20SNAlCe test fuel enhances engine brake thermal efficiency (BTE) by 13% and reduces level of pollutants such as unburned hydrocarbon (UBHC) by 38%, nitric oxide by 32%, smoke opacity by 21%, and carbon monoxide by 60% in compared with B100.

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