气候变化领域集成服务门户(CCPortal): Production of drop-in fuels from biomass at high selectivity by combined microbial and electrochemical conversion

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DOI	10.1039/c7ee01303e
	Production of drop-in fuels from biomass at high selectivity by combined microbial and electrochemical conversion
	Urban C.; Xu J.; Sträuber H.; Dos Santos Dantas T.R.; Mühlenberg J.; Härtig C.; Angenent L.T.; Harnisch F.
发表日期	2017
ISSN	17545692
起始页码	2231
结束页码	2244
卷号	10 期号:10
英文摘要	Renewable electrical energy production, such as wind power or photovoltaics, faces temporal fluctuations and spatial separation of source and sink creating the need for suitable storage and conversion technologies. Furthermore, a bio-based economy needs technologies allowing the on-demand and on-site conversion of biomass to platform chemicals and chemical energy carriers. This study combines microbial and electrochemical conversions, allowing production of chemicals from biomass and electricity. Carboxylic acids (CAs) are produced by anaerobic conversion of a renewable feedstock with reactor microbiomes. CAs are subsequently electrochemically upgraded to yield energy-dense alkanes. We present a proof-of-concept based on experimental data for each step in two independent case studies at laboratory scale. During continuous CA fermentation from corn beer, mainly n-caproic and n-caprylic acid were produced yielding in total 0.638 g COD g-1 COD [CA/corn beer]. A batch system fed with corn silage yielded mainly n-butyric acid (0.207 g COD g-1 COD [CA/corn silage]), and some n-caproic acid (0.030 g COD g-1 COD [CA/corn silage]). The CAs were removed from the fermentation broth using a pertraction system. Subsequently, the CAs were electrochemically converted via Kolbe reaction and other reaction pathways. Depending on the carbon chain length of the CAs, liquid alkanes (from medium-chain CAs) or gaseous alkanes and alcohols (from short-chain CAs) were gained. Coulombic efficiencies of up to 80% were achieved despite the alkaline (pH 9) electrolysis conditions that are dictated by the pertraction system. Remarkably, CAs with a carbon chain length of six or more C-atoms were successfully converted to liquid alkanes at a high yield (in total: 0.480 g COD g-1 COD [hydrocarbon/corn beer]). This was achieved at an energy input of only 0.100 kW h per mol of converted CA (considering the electrochemical half cell reaction). Noteworthily, the electrochemical CA conversion is much faster than the CA fermentation, allowing intermittent electrolysis during periods of excess electrical power. We demonstrate that the finally gained product is suitable as a drop-in fuel without any further downstream processing. The future general potential as well as requirements for the concept are discussed. © The Royal Society of Chemistry.
英文关键词	Alkalinity; Biomass; Chain length; Chains; Digital storage; Drops; Electrolysis; Fermentation; Hydrocarbon refining; Indicators (chemical); Paraffins; Saturated fatty acids; Wind power; Carbon-chain length; Conversion technology; Coulombic efficiency; Downstream-processing; Electrochemical conversion; Half-cell reactions; Renewable feedstocks; Temporal fluctuation; Butyric acid; biofuel; biomass; electrical power; electrochemical method; electrokinesis; fermentation; microbial activity; photovoltaic system; wind power; Zea mays
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/190407
作者单位	UFZ - Helmholtz-Centre for Environmental Research, Department of Environmental Microbiology, Permoserstraße 15, Leipzig, 04318, Germany; Cornell University, Department of Biological and Environmental Engineering, 226 Riley-Robb Hall, Ithaca, NY 14853, United States; DBFZ - Deutsches Biomasseforschungszentrum Gemeinnützige GmbH, Department Biochemical Conversion, Torgauer Straße 116, Leipzig, 04347, Germany; University of Tübingen, Center for Applied Geoscience, Hölderlinstr. 12, Tübingen, 72074, Germany
推荐引用方式 GB/T 7714	Urban C.,Xu J.,Sträuber H.,et al. Production of drop-in fuels from biomass at high selectivity by combined microbial and electrochemical conversion[J],2017,10(10).
APA	Urban C..,Xu J..,Sträuber H..,Dos Santos Dantas T.R..,Mühlenberg J..,...&Harnisch F..(2017).Production of drop-in fuels from biomass at high selectivity by combined microbial and electrochemical conversion.Energy & Environmental Science,10(10).
MLA	Urban C.,et al."Production of drop-in fuels from biomass at high selectivity by combined microbial and electrochemical conversion".Energy & Environmental Science 10.10(2017).