Effect of blending local plastic pyrolytic oil with diesel fuel on lubricity

The utilization of pyrolytic plastic oil (PPO) enhances the engine performance and exhaust emission compared with the diesel. Accordingly, PPO is promising to be implemented as a diesel substitute. This work portrays the exploratory outcomes to analyse the lubricity of PPO from catalytic pyrolysis of low-density polyethylene (LDPE) waste. Fourier transform infrared (FTIR) spectroscopy was implemented to examine the saturation level of PPO and diesel. For comparative study, the physicochemical properties of PPO, polyalphaolefin 8 (PAO8) and trimethylpropane trioleate (TMPTO) were determined and, their lubricities were compared. In this study, PPO presented an outstanding lubricity property in terms of lowest coefficient of friction (COF). Five blends were prepared from PPO and diesel for further studies. Their wear and lubricity characteristics were computed using high-frequency reciprocating rig ( HFRR) based on ASTM D6079 standard. Scanning electron microscopy (SEM) was used to evaluate the worn surfaces of specimen plates. The results of FTIR analysis suggests that PPO has good quality as diesel. PO10 showed the lowest average COF compared to diesel. A lower concentration of PPO decreased COF, and higher concentration of PPO caused higher wear as remarked by SEM. Consequently, PPO is believed to become a preferable replacement for commercial lubricant.