A new kind of nanohybrid poly(tetradecyl methyl-acrylate)-graphene oxide as pour point depressant to evaluate the cold flow properties and exhaust gas emissions of diesel fuels

In this paper, a new kind of nanohybrid poly(tetradecyl methyl-acrylate)-graphene oxide (PMA 14 -GO) as pour point depressant (PPD) was prepared from graphene oxide, using matrix via in situ free radical polymerization. The effect of PMA 14 -GO (i.e., PMA 14 -3GO, PMA 14 -6GO and PMA 14 -9GO) PPDs on the cold flow properties and exhaust gas emissions of diesel fuels were studied. Results indicated that PMA 14 -GO PPDs exhibited a better effect on cold filter plugging point (CFPP) and solidifying point (SP) than that of PMA 14 . Among them, PMA 14 -6GO and PMA 14 -9GO were the most suitable candidates for improving CFPP and SP. Specifically, upon addition of 0.2   wt% PMA 14 -6GO could reduce the CFPP of diesel by 14   °C, and 0.2   wt% PMA 14 -9GO reduced the SP of diesel by 19   °C. Moreover, PMA 14 -GO PPDs could effectively lower the low-temperature. Other fuel properties were also determined and compared with the ASTM D975 . Given the heterogeneous nucleation mechanism, uniform and tiny particle-shaped crystals were observed by polarizing optical microscopy and differential scanning calorimetry. In addition, burning diesel fuel with PMA 14 -GO PPDs effectively reduced HC and CO emissions, whereas NO and CO 2 emissions increased with the increased engine speed at full load.