globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1821673116
论文题名:
Toward electrochemical synthesis of cement—An electrolyzer-based process for decarbonating CaCO3 while producing useful gas streams
作者: Ellis L.D.; Badel A.F.; Chiang M.L.; Park R.J.-Y.; Chiang Y.-M.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:23
起始页码: 12584
结束页码: 12591
语种: 英语
英文关键词: Carbon dioxide ; Cement ; Decarbonization ; Electrolysis ; Hydrogen
Scopus关键词: calcium carbonate ; calcium oxide ; cement ; fossil fuel ; oxygen ; silicon dioxide ; Article ; biofuel production ; carbon footprint ; chemical modification ; combustion ; decarbonation ; decomposition ; electrochemical analysis ; electrolysis ; high temperature procedures ; pH ; precipitation ; priority journal ; renewable energy ; stoichiometry ; synthesis
英文摘要: Cement production is currently the largest single industrial emitter of CO2, accounting for ∼8% (2.8 Gtons/y) of global CO2 emissions. Deep decarbonization of cement manufacturing will require remediation of both the CO2 emissions due to the decomposition of CaCO3 to CaO and that due to combustion of fossil fuels (primarily coal) in calcining (∼900 °C) and sintering (∼1,450 °C). Here, we demonstrate an electrochemical process that uses neutral water electrolysis to produce a pH gradient in which CaCO3 is decarbonated at low pH and Ca(OH)2 is precipitated at high pH, concurrently producing a high-purity O2/CO2 gas mixture (1:2 molar ratio at stoichiometric operation) at the anode and H2 at the cathode. We show that the solid Ca(OH)2 product readily decomposes and reacts with SiO2 to form alite, the majority cementitious phase in Portland cement. Electrochemical calcination produces concentrated gas streams from which CO2 may be readily separated and sequestered, H2 and/or O2 may be used to generate electric power via fuel cells or combustors, O2 may be used as a component of oxyfuel in the cement kiln to improve efficiency and lower CO2 emissions, or the output gases may be used for other value-added processes such as liquid fuel production. Analysis shows that if the hydrogen produced by the reactor were combusted to heat the high-temperature kiln, the electrochemical cement process could be powered solely by renewable electricity. © 2020 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164179
Appears in Collections:气候变化与战略

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作者单位: Ellis, L.D., Department of Material Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Badel, A.F., Department of Material Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Chiang, M.L., Department of Material Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Park, R.J.-Y., Department of Material Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Chiang, Y.-M., Department of Material Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, United States

Recommended Citation:
Ellis L.D.,Badel A.F.,Chiang M.L.,et al. Toward electrochemical synthesis of cement—An electrolyzer-based process for decarbonating CaCO3 while producing useful gas streams[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(23)
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