Journal
BIOTECHNOLOGY ADVANCES
Volume 32, Issue 8, Pages 1460-1475Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.biotechadv.2014.09.004
Keywords
Biogas; Biological conversion; Liquid fuels; Methane; Natural gas
Categories
Funding
- USDA NIFA Biomass Research and Development Initiative Program [2012-10008-20302]
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Methane is the main component of natural gas and biogas. As an abundant energy source, methane is crucial not only to meet current energy needs but also to achieve a sustainable energy future. Conversion of methane to liquid fuels provides energy-dense products and therefore reduces costs for storage, transportation, and distribution. Compared to thermochemical processes, biological conversion has advantages such as high conversion efficiency and using environmentally friendly processes. This paper is a comprehensive review of studies on three promising groups of microorganisms (methanotrophs, ammonia-oxidizing bacteria, and acetogens) that hold potential in converting methane to liquid fuels; their habitats, biochemical conversion mechanisms, performance in liquid fuels production, and genetic modification to enhance the conversion are also discussed. To date, methane-to-methanol conversion efficiencies (moles of methanol produced per mole methane consumed) of up to 80% have been reported. A number of issues that impede scale-up of this technology, such as mass transfer limitations of methane, inhibitory effects of H2S in biogas, usage of expensive chemicals as electron donors, and lack of native strains capable of converting methane to liquid fuels other than methanol, are discussed. Future perspectives and strategies in addressing these challenges are also discussed. (C) 2014 Elsevier Inc. All rights reserved.
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