Abiotic methanogenesis from organosulphur compounds under ambient conditions
Abiotic methanogenesis from organosulphur compounds under ambient conditions
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DOI：
10.1038/ncomms5205
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发表时间：
2014-06-01
影响因子：
16.6
通讯作者：
Keppler, Frank
中科院分区：
文献类型：
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作者：
Althoff, Frederik;Benzing, Kathrin;Keppler, Frank
环境中的甲烷是由生物和非生物过程产生的。生物甲烷化是指生活在无氧环境中的微生物产生甲烷。非生物甲烷的形成是在高温和/或高压条件下进行的。在这里，我们提出了一种化学反应，在环境大气压和温度的高度氧化条件下，有机硫化合物很容易形成甲烷。当以铁（II/III）、过氧化氢和抗坏血酸为试剂时，有机硫化合物的s -甲基有效地转化为甲烷。在第一步中，甲基硫化物被氧化成相应的硫化物。下一步，通过均解键裂解对亚砜进行去甲基化，形成甲基自由基，最终高产出甲烷。由于甲基硫化物的硫氧化在环境中无处不在，这种新的化学途径可能模仿活的有氧生物中的甲烷形成。
Methane in the environment is produced by both biotic and abiotic processes. Biomethanation involves the formation of methane by microbes that live in oxygen-free environments. Abiotic methane formation proceeds under conditions at elevated temperature and/or pressure. Here we present a chemical reaction that readily forms methane from organosulphur compounds under highly oxidative conditions at ambient atmospheric pressure and temperature. When using iron(II/III), hydrogen peroxide and ascorbic acid as reagents, S-methyl groups of organosulphur compounds are efficiently converted into methane. In a first step, methyl sulphides are oxidized to the corresponding sulphoxides. In the next step, demethylation of the sulphoxide via homolytic bond cleavage leads to methyl radical formation and finally to methane in high yields. Because sulphoxidation of methyl sulphides is ubiquitous in the environment, this novel chemical route might mimic methane formation in living aerobic organisms.