Modeling the Change of Green Coke to Calcined Coke Using Qingdao High-Sulfur Petroleum Coke

This paper presents macromolecular models of sulfur-containing Qingdao petroleum. The results were investigated with ultimate analysis, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. The models showed that organic sulfur, nitrogen, and oxygen in the coke were mainly in the forms of thiophene-containing polycyclic aromatic hydrocarbon, polycyclic aromatic hydrocarbons containing pyrrole or pyridine, and C═O or C–O–C, respectively. During calcination, the aromaticity of coke increased, with element contents and functional groups changing substantially. Moreover, the models explained the desulfurization mechanism of coke during calcination.