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Three-Dimensional Printable Sodium Carbonate Composite Sorbents for Efficient Biogas Upgrading.

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New sodium carbonate/silicone composites efficiently capture carbon dioxide (CO2) for biogas purification. These low-cost, printable sorbents offer high selectivity and low-energy regeneration, making biomethane production more economical.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Biogas upgrading is crucial for producing pipeline-quality biomethane.
  • Current methods for carbon dioxide (CO2) removal face challenges in cost, efficiency, and energy consumption.

Purpose of the Study:

  • To develop and characterize novel sodium carbonate/silicone composite sorbents for selective CO2 capture.
  • To evaluate the performance of these sorbents in biogas purification and assess their economic viability.

Main Methods:

  • Composite sorbents were synthesized and characterized using X-ray computed tomography, SEM, and XRD.
  • Sorption capacities and breakthrough curves were measured using simulated and industrial biogas.
  • A numerical model was developed and validated with experimental data to simulate industrial-scale processes.

Main Results:

  • The composite sorbents demonstrated high specific CO2 sorption rates (>5 μmol s-1 g-1 bar-1) and selectivity.
  • Sorption capacities reached up to 0.62 mol CO2 kg-1.
  • Technoeconomic analysis indicated a lower upgrading cost of ~$0.97 per GJ compared to existing techniques.

Conclusions:

  • The developed composite sorbents offer a promising, cost-effective solution for biogas upgrading.
  • Their properties combine the advantages of liquid and solid sorbents, with low-energy regeneration.
  • This technology has the potential to significantly reduce the cost of producing biomethane.