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            The requirement for C2H2concentrations below 2 parts per million (ppm) in gas streams for C2H4polymerization necessitates its semihydrogenation to C2H4. We demonstrate selective chemical looping combustion of C2H2in C2H4-rich streams by Bi2O3as an alternative catalytic pathway to reduce C2H2concentration below 2 ppm. Bi2O3combusts C2H2with a first-order rate constant that is 3000 times greater than the rate constant for C2H4combustion. In successive redox cycles, the lattice O of Bi2O3can be fully replenished without discernible changes in local Bi coordination or C2H2combustion selectivity. Heterolytic activation of C–H bonds across Bi–O sites and the higher acidity of C2H2results in lower barriers for C2H2activation than C2H4, enabling selective catalytic hydrocarbon combustion leveraging differences in molecular deprotonation energies.more » « lessFree, publicly-accessible full text available February 14, 2026
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