Abstract
AbstractThe carbon to CaC2 route is promising to provide a sustainable elementary unit, C2H2, for the organic synthesis industry, but the traditional thermal reaction process suffers from low carbon efficiency, harmful gas contamination, high temperature operation, and risky CO management. We herein report a high carbon efficiency (ca. 100 %) conversion of biochar to C2H2 through an electrolytic synthesis of solid CaC2 in molten CaCl2/KCl/CaO at 973 K. The main reactions are carbon reduction to CaC2 at the solid carbon cathode and oxygen evolution at an inert anode. Meanwhile, the electrolysis removes S and P from the solid cathode, avoiding the formation of CaS and Ca3P2 in CaC2 and consequently eliminating H2S and PH3 contamination in the finally produced C2H2.
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