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Air pollution

Innovative Process for Reducing Greenhouse Gases Showcases Environmental Benefits

Strategic Insights

— 1 min read

Researchers at Ming Chi University of Technology have made a groundbreaking discovery by developing a novel approach to reduce nitrous oxide (N2O) emissions while capturing carbon dioxide (CO2). This innovative process, funded by the National Science and Technology Council (NSTC) Zambia and Ming Chi University of Technology, utilizes methane (CH4) and calcium sulphide/calcium sulphate (CaS/CaSO4) as a redox mediator to convert N2O.

Key Takeaways:

  • The process involves a multifaceted mechanism that includes N2O reduction using CH4, CaS/CaSO4 mediation, and CO2 capture, which has been thermodynamically feasible and achievable.
  • Thermodynamic simulations showed a temperature-dependent dichotomy, with CaS-assisted reduction of N2O and CaS carbonation reactions favored at lower temperatures, exhibiting exothermic behavior, and CaSO4-assisted oxidation of CH4 favored at higher temperatures, displaying endothermic characteristics.
  • The computed Gibbs free energies (ΔG0) for the CaS-assisted reduction of N2O, CaSO4-assisted oxidation of CH4, and carbonation of CaS reaction confirmed the thermodynamic feasibility of the process, with efficient and environmentally friendly N2O reduction.
  • The process showed improved carbon carbonate (CaCO3) selectivity and eradicated hydrogen sulphide (H2S) production, facilitating scalable solutions.
  • Removing water before carbonating CaS eliminated H2S production and enhanced CaCO3 selectivity (CO2 capture) to 0.67 at 573 K, outperforming the 0.50 selectivity achieved with water present.

Statistics:

  • The process showed a temperature-dependent dichotomy, with CaS-assisted reduction of N2O and CaS carbonation reactions favored at lower temperatures (-373 to 1273 K).
  • The ΔG0 analysis yielded an efficient and environmentally friendly N2O reduction process, with a computed ΔG0 value of -31.5 kJ/mol for CaS-assisted reduction of N2O and -37.1 kJ/mol for CaSO4-assisted oxidation of CH4.
  • The CaCO3 selectivity was improved to 0.67 at 573 K, outperforming the 0.50 selectivity achieved with water present.
  • The process eradicated H2S production, which is a significant environmental benefit.

Sources:

  • Cyclic Reduction of Greenhouse Gases (N2o and Ch4) With Co2 Capture Over Cas/caso4 Mediator: Feasibility-check From the Perspective of Thermodynamics. International Journal of Hydrogen Energy, 2025;145:623-631.
  • NewsRx. Study Data from Ming Chi University of Technology Update Knowledge of Physics [Cyclic Reduction of Greenhouse Gases (N2o and Ch4) With Co2 Capture Over Cas/caso4 Mediator: Feasibility-check From the Perspective of Thermodynamics]. Global Warming Focus. July 21, 2025; p 244.

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