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Related Concept Videos

Adsorption Isotherms II01:25

Adsorption Isotherms II

Brunauer, Emmett, and Teller (BET) introduced a theory in 1938 that modified Langmuir's assumptions to explain multilayer physical adsorption. This theory is applicable to Type II isotherms and provides a more realistic picture of adsorption processes. The BET theory assumes a uniform solid surface with localized adsorption sites, where adsorption at one site doesn't affect adsorption at neighboring sites. This theory also allows for the possibility of additional molecules being adsorbed on top...
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Bioreactors are engineered vessels designed to cultivate microorganisms under controlled conditions for industrial bioprocessing. They maintain sterility and allow precise regulation of pH, temperature, oxygen, and nutrient levels to optimize microbial growth and metabolite production. Bioreactors range from small laboratory units of 1 liter to industrial systems holding up to 500,000 liters, though only about 75% of their volume is actively used for fermentation. The remaining headspace...

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Defining Targets for Adsorbent Material Performance to Enable Viable BECCS Processes.

Hannah E Holmes1, Ryan P Lively1, Matthew J Realff1

  • 1School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332, United States.

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Developing advanced carbon capture adsorbents is key for economic bioenergy with carbon capture and storage (BECCS). Optimal adsorbent properties, including capacity, lifetime, and heat of adsorption, are crucial for achieving below $100/tonne-CO2 costs.

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Area of Science:

  • Chemical Engineering
  • Environmental Science
  • Materials Science

Background:

  • Bioenergy with Carbon Capture and Storage (BECCS) is a promising negative emissions technology.
  • The economic viability of BECCS is heavily dependent on the cost and performance of CO2 capture adsorbents.
  • Current adsorbent limitations pose a significant challenge to widespread BECCS implementation.

Purpose of the Study:

  • To define target properties of CO2 capture adsorbents for economically viable BECCS.
  • To elucidate the impact of adsorbent degradation on process economics.
  • To identify optimal adsorbent characteristics balancing capture efficiency and regeneration energy.

Main Methods:

  • Economic modeling of BECCS processes incorporating sorbent degradation.
  • Analysis of adsorbent properties including working capacity, lifetime, and heat of adsorption.
  • Postulation of an optimal heat of adsorption through affinity and regeneration energy balance.

Main Results:

  • Sorbent lifetime is a critical factor influencing BECCS process costs.
  • An optimal heat of adsorption around -40 kJ/mol is identified.
  • Adsorbents with working capacities >0.75 mol/kg and lifetimes >2 years are necessary for <$100/tonne-CO2.
  • Exponential degradation decay constants below 5 × 10^-6 cycle^-1 are recommended.

Conclusions:

  • Achieving a levelized cost of carbon below $100/tonne-CO2 is feasible with optimized adsorbents.
  • Degradation-resistant adsorbents are essential for cost-effective BECCS.
  • The study provides specific design targets for next-generation CO2 capture materials for BECCS.