Toward electrochemical synthesis of cement-An electrolyzer-based process for decarbonating CaCO₃ 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 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

SUBMITTER: Ellis LD 

PROVIDER: S-EPMC7293631 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature