5.1 Biomass Decomposition
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Major Pyrolysis Reaction
Biomass → char + H 2 + CO + CO 2 + CH 4 + hydrocarbon + tar
Oxidation Reactions
C + 1
2O 2 → CO + 1
2O 2 → CO 2
H 2 + 1
2O 2 → H 2 O
Carbon Gasification (Boudouard Reaction)
C + CO 2 → 2CO
Methane Formation
C + 2H 2 → CH 4
Water Gas Reactions
C + H 2 O → CO + H 2
C + 2H 2 O → CO 2 + 2H 2
Steam Reforming Reactions
CH 4 + H 2 O → CO 2 + 3H 2
CH 4 + H 2 O → CO 2 + 3H 2
Carbon Monoxide Shift Reaction
CO + H 2 O → H 2
Cracking Reactions
C X H Y + nH 2 O → n CO 2 +
n + 1
2
H 2
Tar + H 2 O → CO 2 + H 2 + CO + low molecular weight hydrocarbons
Supercritical water gasification (SWG) is another thermochemical process for
hydrogen production. The gas and liquid phases of water become completely miscible
51
Major Pyrolysis Reaction
Biomass → char + H 2 + CO + CO 2 + CH 4 + hydrocarbon + tar
Oxidation Reactions
C + 1
2O 2 → CO + 1
2O 2 → CO 2
H 2 + 1
2O 2 → H 2 O
Carbon Gasification (Boudouard Reaction)
C + CO 2 → 2CO
Methane Formation
C + 2H 2 → CH 4
Water Gas Reactions
C + H 2 O → CO + H 2
C + 2H 2 O → CO 2 + 2H 2
Steam Reforming Reactions
CH 4 + H 2 O → CO 2 + 3H 2
CH 4 + H 2 O → CO 2 + 3H 2
Carbon Monoxide Shift Reaction
CO + H 2 O → H 2
Cracking Reactions
C X H Y + nH 2 O → n CO 2 +
n + 1
2
H 2
Tar + H 2 O → CO 2 + H 2 + CO + low molecular weight hydrocarbons
Supercritical water gasification (SWG) is another thermochemical process for
hydrogen production. The gas and liquid phases of water become completely miscible