Table 3 Oxidation half reactions of methane to various products and reduction half reactions of various electron acceptors
From: Assessing methanotrophy and carbon fixation for biofuel production by Methanosarcina acetivorans
Oxidation half reactions | ΔG (kJ/mole product) | ΔG (kJ/mole methane) |
|---|---|---|
\(CH_{4} + 2 H_{2} O \to CO_{2} + 8 H^{ + } + 8 e^{ - }\) | −202.79 | −202.79 |
\(2 CH_{4} + 2 H_{2} O \to CH_{3} COOH + 8 H^{ + } + 8 e^{ - }\) | −193.44 | −96.72 |
\(4 CH_{4} + H_{2} O \to CH_{3} CH_{2} CH_{2} CH_{2} OH + 8 H^{ + } + 8 e^{ - }\) | −113.48 | −28.37 |
\(4 CH_{4} + H_{2} O \to CH_{3} CH(CH_{3} )CH_{2} OH + 8 H^{ + } + 8 e^{ - }\) | −104.87 | −26.22 |
\(2 CH_{4} + H_{2} O \to CH_{3} CH_{2} OH + 4 H^{ + } + 4 e^{ - }\) | −31.06 | −15.53 |
\(CH_{4} + H_{2} O \to CH_{3} OH + 2 H^{ + } + 2 e^{ - }\) | +14.83 | +14.83 |
Reduction half reactions | ΔG (kJ/mole oxidant) | ΔG (kJ/electron-pair) |
|---|---|---|
\(Fe^{3 + } + e^{ - } \to Fe^{2 + }\) | −70.22 | −140.44 |
\(MnO_{2} + 4 H^{ + } + 2 e^{ - } \to Mn^{2 + } + 2 H_{2} O\) | −77.65 | −77.65 |
\(NO_{3}^{ - } + 10 H^{ + } + 8 e^{ - } \to NH_{4}^{ + } + 3 H_{2} O\) | −272.75 | −68.15 |
\(SO_{4}^{2 - } + 10 H^{ + } + 8 e^{ - } \to H_{2} S + 4 H_{2} O\) | +178.14 | +44.53 |