Abstract: The catalytic cracking reaction of waste cooking oil was studied on self-made DY catalyst. The structure and composition of raw material and liquid products were characterized by 1H-NMR, 13C-NMR, gas chromatograph and gas chromatograph-mass spectrometer techniques. The results showed that the catalytic cracking reaction produced 24.88% of gas, 41.03% of gasoline, 21.73% of diesel, 2.53% of heavy oil, 1.03% of coke and 8.80% of water. Unlike the NMR spectra of raw material, 1H-NMR spectra of liquid products displayed weak peaks of alkene hydrogen, but strong peaks of aromatic hydrogen. Meanwhile, 13C-NMR spectra of liquid products observed no obvious peaks of carbonyl carbon or glycerol-based carbon. The results of hydrocarbon group composition analysis showed that gasoline product contained 53.4% of saturation and 34.8% of aromatics; 87.4% of diesel components were aromatic hydrocarbons, and 43.4% were alkylbenzenes. The mass fraction of aromatic hydrocarbons in heavy oil reached 98.5%, in which the mass fraction of four ring aromatic hydrocarbons was about 49.5%.

Key words: waste cooking oil, catalytic cracking, NMR, hydrocarbon composition, gasoline