Dynamic adsorption separation of c-C4F8/C3F8 for effective purification of perfluoropropane electronic gas

摘要

The separation of c-C4F8/C3F8 mixtures at ambient conditions is challenging in the electronic industry due to their similar physical and chemical properties. The object of this work is to explore effective adsor-bents for c-C4F8/C3F8 separation and elucidate its separation mechanism. Through screening a series of absorbents, KOH activated glucose-based carbon (GC-K1) stands out as the most effective adsorbent for the separation of c-C4F8/C3F8 mixtures with the highest dynamic selectivity of 3.7 and adsorption uptake of 1.2 mmol/g for c-C4F8, as well as multiple-cycle regenerability. The effects of textural proper -ties, particularly the micropore size, on c-C4F8/C3F8 separation were further investigated experimentally and computationally. The effective c-C4F8/C3F8 separation over GC-K1 may be attributed to the discrep-ancy in the constrained adsorption affinity of c-C4F8 over C3F8 via the small ultramicropore at-5.9 angstrom. This study provides valuable insights into the adsorptive purification of electronic gases using ultramicrop-orous carbon via the pore confinement effect.

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