Metal-organic framework with optimally selective xenon adsorption and separation.

Area of Science:

• Materials Science
• Nuclear Engineering
• Chemistry

Background:

• Nuclear energy is a key low-emissions alternative to fossil fuels.
• Reprocessing used nuclear fuel is essential for sustainability but releases radioactive noble gases like xenon and krypton.
• Current methods for noble gas removal, such as cryogenic distillation, are expensive.

Purpose of the Study:

• To computationally screen metal-organic frameworks (MOFs) for selective xenon and krypton adsorption.
• To identify a cost-effective alternative to cryogenic distillation for nuclear fuel reprocessing off-gas treatment.
• To evaluate the adsorption capacity and selectivity of promising MOF candidates.

Main Methods:

• High-throughput computational screening of large MOF databases.
• In-silico identification of MOFs with high xenon selectivity.
• Experimental validation of predicted MOF performance.

Main Results:

• SBMOF-1 was computationally identified as the most selective MOF for xenon adsorption.
• SBMOF-1 demonstrated the highest reported xenon adsorption capacity.
• SBMOF-1 exhibited remarkable Xe/Kr selectivity under relevant reprocessing conditions.

Conclusions:

• SBMOF-1 is a highly promising material for selective xenon capture in nuclear fuel reprocessing.
• This MOF offers a potentially more economical and efficient solution compared to cryogenic distillation.
• Further research into SBMOF-1 could significantly advance radioactive noble gas management.