“…1 shows the molecular structures of PODE 1 , PODE 2 and PODE 3 . The chain structure of PODE n featuring the C-O bond ensures its high oxygen content (nearly 50%), and as such generates less soot emissions in combustion [ 4 , 5 ]. Researchers found that PODE 2-5 have similar physical properties to diesel fuel, and PODE 2-5 is stable and mutually soluble with diesel fuel at room temperature [ 6 , 7 ].…”