INVESTIGATION OF HYDROGEN-GRAPHENE OXIDE SYNERGY ON COMBUSTION ANDEMISSION CHARACTERISTICS OF WASTE PLASTICOIL-DIESELBLENDS
Waste plastic oil (WPO) from pyrolysis provides a waste-to-energy pathway for compression-ignition engines, yet its lower cetane quality, broad boiling range, and aromatic content delay ignition and intensify soot formation. Theobjective of the current study is to evaluate the coupled effects of hydrogen and graphene oxide (GO) on combustionphasing, thermal efficiency, and regulated emissions of a WPO-diesel blend. Graphene oxide was dispersed at 100ppm via solvent-assisted probe ultrasonication and nano fuel stability was verified through UV-Vis monitoring, for which absorbance drift showed less than 5% over seven days. Engine tests were carried out on a four-stroke, single- cylinder, direct-injection diesel engine at 25-100% load with a 10% hydrogen energy share. At full load, WPO20+H2+GO achieved a brake thermal efficiency of 34.4%, nearly 3.6% above WPO20 and 2.3%higher thandiesel. Brake specific fuel consumption had fallen from 281 g kW/h for WPO20 to 238 g kW/h, while smokedecreased from FSN 6 to FSN 1. Carbon monoxide and unburned hydrocarbon emissions had been reducedto0.08% and 2.5 ppm, respectively. NOx reached 1500 ppm with hydrogen alone but decreased to 1450 ppmwhengraphene oxide was added. These findings demonstrated that hydrogen and graphene oxide co-enrichment offeredapractical combustion upgrade strategy for recovering the performance of plastic-derived fuels. Future work shouldtarget EGR-assisted NOx mitigation, injector deposit tracking, and multicylinder validation. The current study alignswith SDG 7 (Affordable Clean Energy) by contributing to improved energy efficiency and alternative fuel development.
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