Mitigation of carbon footprints through a blend of biofuels and oxygenates, combined with post-combustion capture system in a single cylinder CI engine

Abstract Mitigation of carbon footprints in compression ignition (CI) engines can be achieved using biofuels (carbon neutral and carbon dioxide (CO 2 ) sequestration effects), with oxygenates and effective post-combustion capture systems. The present study focuses on the net reduction of CO 2 emissions through the combination of karanja oil methyl ester (KOME), orange oil (ORG), oxygenates blended fuel and zeolite-based post-combustion capture system (ZPCS) in a single cylinder CI engine. KOME emitted higher CO 2 emissions as compared to the diesel. Blending equal volume of ORG with KOME reduced CO 2 emissions further by 27% compared to KOME but still higher compared to diesel by 11%, at 100% load condition. Four oxygenates, namely methanol (M), ethanol (E), n-butanol (B) and n-pentanol (P) were blended 20% by volume with the KOME-ORG. KOME-ORG + M20 emitted minimum CO 2 compared to other oxygenate blends due to stoichiometric carbon balance, about 38% less compared to KOME nearly reaching diesel emission characteristics at 100% load. Additionally ZCPS was placed in the exhaust line and tested with all oxygenate blends with KOME-ORG, methanol blend led to 65% reduction in CO 2 emissions compared to KOME and 53% reduction compared to diesel, at 100% load.