Si-doped graphene: A promising metal-free catalyst for oxidation of SO2

â¿¢The oxidation of SO2 over Si-doped graphene is studied.â¿¢Both Langmuirâ¿¿Hinshelwood (LH) and Eleyâ¿¿Rideal (ER) mechanisms are considered.â¿¢Si-doped graphene can be used as a metal-free catalyst for oxidation of SO2.