Enhancement of compression ignition engine performance and emission reduction using pyrolyzed waste plastic oil blended with aluminum oxide nanoparticles

Abstract This research investigates the use of waste plastic fuel in compression ignition (CI) engines, focusing on two main objectives: producing pyrolysis plastic oil from waste plastic and reducing dependence on conventional CI engine fuels. The pyrolysis process involves heating low‐density polyethylene (LDPE) in a reactor at temperatures between 300°C and 500°C to generate plastic oil. Engine performance was evaluated using various blends of this oil, including 10%, 20%, and 30% mixtures with diesel. Additionally, 30 ppm of aluminum oxide (Al 2 O 3 ) nanoparticles were mixed with 10% and 30% pyrolyzed waste plastic oil (WPO) to enhance fuel properties and engine performance. The study analyzed the impact of nanoparticles on engine efficiency and emissions, revealing that adding 30 ppm Al 2 O 3 to all WPO blends improved overall performance compared to conventional diesel. Notably, the WPO 30 + 30 ppm Al 2 O 3 blend significantly reduced emissions, with a 37.45% decrease in carbon monoxide (CO), a 22.5 ppm reduction in unburned hydrocarbons (HC), and a 33.23% reduction in smoke opacity. However, nitrogen oxide (NO x ) emissions increased by 487 ppm compared to diesel.