biostudies-literatureUnknown9(1)Zhang YCO₂ oxidative coupling of methane has been achieved by using CO₂ as the oxidant. We explored various catalysts with the capability of producing C_2,3 hydrocarbons and found that the use of a CaO-based oxide with sodium (Na) and chloride (Cl) allowed for remarkable direct methane conversion with a C_2,3 yield of 6.6% at 950 °C. Microstructural characterisations showed that the optimal sample contained sodium carbonate (Na₂CO₃) covered with fine calcium oxide particles with chloride doping. Interestingly, sodium carbonate acted as a molten salt catalyst in this scenario. The synthesised active components are earth-abundant and can increase the possibility of achieving higher yields of hydrocarbons.Scientific reports15454https://www.ebi.ac.uk/biostudies/studies/S-EPMC6820859biostudies-literatureCO₂ oxidative coupling of methane using an earth-abundant CaO-based catalyst.PMC6820859Peng XCho YYamaguchi AFujita TZhang YMiyauchi MAbe HfalseCO₂ oxidative coupling of methane using an earth-abundant CaO-based catalyst.CO₂ oxidative coupling of methane has been achieved by using CO₂ as the oxidant. We explored various catalysts with the capability of producing C_2,3 hydrocarbons and found that the use of a CaO-based oxide with sodium (Na) and chloride (Cl) allowed for remarkable direct methane conversion with a C_2,3 yield of 6.6% at 950 °C. Microstructural characterisations showed that the optimal sample contained sodium carbonate (Na₂CO₃) covered with fine calcium oxide particles with chloride doping. Interestingly, sodium carbonate acted as a molten salt catalyst in this scenario. The synthesised active components are earth-abundant and can increase the possibility of achieving higher yields of hydrocarbons.2019-01-01T00:00:00Z2019 Oct2025-04-05T13:30:48.371Z2019-11-12T08:06:06ZS-EPMC68208593166407610.1038/s41598-019-51817-2