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| 1 | Helena Kang | -- | 236 | 2026-09-24 03:41:12 |
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Methane oxidation is the conversion of CH4 to a more oxidized carbon product—methanol, CO, CO2, or biomass carbon—by transfer of oxygen atoms and/or electrons to the methane carbon. In catalysis and oxidation reactions the concept is bounded by methane as the substrate and by a net increase in the oxidation state of that carbon. Essential features are activation of the inert C–H bond, an oxidant (O2, a metal-oxo, nitrite, or a metal ion), and a pathway that determines whether the carbon stops at a partially oxidized product or proceeds to CO2. Anaerobic methane oxidation couples CH4 oxidation to denitrification or to the reduction of manganese or iron, so that oxygen in the formal sense need not be the terminal electron acceptor [1][2][3]. Aerobic methanotrophy uses O2 to hydroxylate methane at a metalloenzyme, including in extremely acidophilic Verrucomicrobia [4]. Nitrogen species can regulate the same oxidation in soils and sediments by competing at the methane-activating enzyme or by supplying an alternative electron acceptor [1][2]. The concept is distinguished from methane pyrolysis, which does not raise the carbon oxidation state by oxygen-atom or electron-acceptor coupling, and from Fischer–Tropsch chemistry, which builds C–C bonds from CO rather than oxidizing CH4. Conceptual limits exclude combustion descriptions that omit the catalytic or enzymatic C–H activation step as the defining event.
References
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