2019
DOI: 10.1073/pnas.1821673116
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Toward electrochemical synthesis of cement—An electrolyzer-based process for decarbonating CaCO 3 while producing useful gas streams

Abstract: Cement production is currently the largest single industrial emitter of CO2, accounting for ∼8% (2.8 Gtons/y) of global CO2emissions. Deep decarbonization of cement manufacturing will require remediation of both the CO2emissions due to the decomposition of CaCO3to 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 CaCO3is decarbona… Show more

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Cited by 178 publications
(138 citation statements)
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“…Nevertheless, a holistic techno-economic analysis is beyond the scope of this work. The cost for the electrochemical process depends on the price of electricity and this varies depending on location as electricity cost varies as it could be null or negative if obtained from renewable resources 32 . Nevertheless, Table 3 shows the cost of chemical formulations in removing 1 kg of pyrite scale.…”
Section: Resultsmentioning
confidence: 99%
“…Nevertheless, a holistic techno-economic analysis is beyond the scope of this work. The cost for the electrochemical process depends on the price of electricity and this varies depending on location as electricity cost varies as it could be null or negative if obtained from renewable resources 32 . Nevertheless, Table 3 shows the cost of chemical formulations in removing 1 kg of pyrite scale.…”
Section: Resultsmentioning
confidence: 99%
“…Finally, worldwide, cement production is a significant source of CO 2 (from process emissions and energy use for heating) [ 26 ] and hence contributes to the climate change externality. The taxation of sand is certainly not the appropriate first-best instrument to address this externality.…”
Section: Policy Solutions For Sand Extraction and Tradementioning
confidence: 99%
“…For instance, in the iron & steel industry (the largest emitting industry sector, see Figure 1 ), the reduction of iron oxide (ore) to iron could be performed through (alkaline) iron electrolysis ( Allanore et al., 2008 ). In the cement industry (the third largest industry sector in terms of emissions, see Figure 3 ), ES-based calcination could help reduce CO− 2 emissions substantially ( Ellis et al., 2020 ). On the other hand, water electrolysis (a specific type of ES) can be used to produce hydrogen, which can replace fossil resources as fuel or as a reactant in the chemical, steel, freight, and other sectors ( Glenk and Reichelstein, 2019 ).…”
Section: Introductionmentioning
confidence: 99%