Table 1: Major chemical gasification reactions.

Reaction no. Reaction scheme Chemical reaction R 1(a) C + O2 → CO2 Oxidation reactions R 1(b) C + O2 → CO R 1(c) CO + O2 → CO2 R 2 C + CO2 ↔ 2CO Boudouard reaction R 3 C + H2O ↔ CO + H2 Water-gas reaction R 4 C + 2H2 ↔ CH4 Methanation reaction R 5 CO + H2O ↔ CO2 + H2 Water-gas shift reaction R 6 CH4 + H2O ↔ H2 + CO Methane reforming reaction