2018 Volume 51 Issue 10 Pages 848-854
The effects of heat treatment temperature and additives on the desulfurization of high-sulfur petroleum cokes were investigated in this study. Results showed that alkali (Li, Na and K) carbonate catalytic activity followed the order K>Na>Li at the same heat treatment temperature. The desulfurization chemical activation mechanism of petroleum cokes with additives was then explored using XRD techniques, and the results showed that different additives have different mechanisms and desulfurization rates corresponding to different temperatures, mainly in the form of sulfur dioxide escaping from petroleum coke particles. Petroleum coke desulfurization is controlled primarily by breakage of C–S bonds in the coke, which can be reduced by the additives as they enhance sulfur removal. Recombining C–C bonds via C–S bond breakage also creates more ordered crystal structure in petroleum cokes.