Abstract:Effect of sulfur impurity on coke reactivity was investigated by simulating petroleum coke with low-impurity pitch coke and impurities doping. And its mechanism was discussed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). The results show that sulfur has strong catalysis on both air and CO₂ reactivity of coke in the case of no other impurity interference. Its catalysis is probably realized by triggering organic sulfur→H₂S→SO₂→COS and elemental sulfur (S_x)→SO₂ and organic sulfur→H₂S→COS→S_x→C₂S→COS reaction systems during coke-O₂ and coke-CO₂ reactions, respectively, which are partly circular with functions of increasing carbon consumption and enlarging coke specific surface area.

Key words: coke; reactivity; sulfur impurity; catalysis