CO₂ oxidative coupling of methane using an earth-abundant CaO-based catalyst.

Area of Science:

• Catalysis
• Green Chemistry
• Materials Science

Background:

• Methane (CH4) conversion is crucial for producing valuable chemicals.
• Direct methane conversion using carbon dioxide (CO2) as an oxidant presents a sustainable alternative to traditional methods.
• Developing efficient and cost-effective catalysts is essential for this process.

Purpose of the Study:

• To explore novel catalysts for direct methane conversion using CO2 as an oxidant.
• To achieve high yields of C2,3 hydrocarbons.
• To understand the catalytic mechanism and material properties.

Main Methods:

• Screening of various CaO-based oxide catalysts doped with sodium (Na) and chloride (Cl).
• High-temperature reaction studies at 950°C to evaluate methane conversion and C2,3 hydrocarbon yield.
• Microstructural characterization of the optimal catalyst using techniques like XRD and SEM.

Main Results:

• A CaO-based oxide catalyst doped with Na and Cl demonstrated remarkable direct methane conversion.
• The optimal catalyst achieved a C2,3 hydrocarbon yield of 6.6% at 950°C.
• Microstructural analysis revealed Na2CO3 as a molten salt catalyst, covered with fine CaO particles and chloride doping.

Conclusions:

• The developed CaO-based catalyst, featuring Na2CO3 as a molten salt, is effective for CO2 oxidative coupling of methane.
• The catalyst's components are earth-abundant, suggesting potential for large-scale, cost-effective hydrocarbon production.
• This study opens avenues for enhanced direct methane conversion technologies.