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<p>Heavier hydrogen, deuterium, is widely used in isotope tracing, neutron scattering, and fusion reactions. Adsorptive separation of hydrogen isotopes (D<sub>2</sub>/H<sub>2</sub>) attracts increasing interest, which is mainly based on the kinetic quantum sieving (KQS) effect at low temperature. However, the effective KQS effect requires precise pore regulation and is beyond that of common molecular separation. Herein, we report on one kind of biomass-derived carbon molecular sieve that allows D<sub>2</sub> transport freely but shows an evident diffusion barrier for H<sub>2</sub>, hence effectively separating D<sub>2</sub> from the D<sub>2</sub>/H<sub>2</sub> mixture. Such molecular sieving micropores are created in lignin-rich biomass-derived carbons by transforming cellulose components to slit-type carbon micropores and lignin to a pore size modifier. At 77 K, when entering the sieve-type slit, the diffusion rate of D<sub>2</sub> is 1.8 times that of H<sub>2</sub>; thus, the concentration of D<sub>2</sub> in the recovered gas from our molecular sieving carbon is approximately 10% higher than that from conventional microporous carbons. Aspen adsorption simulations indicate that D<sub>2</sub> can be enriched to 90.1% from 1.0% D<sub>2</sub>/H<sub>2</sub> mixture within 12 successive cycles following a two-bed cryogenic pressure swing adsorption process. The results are useful to advance the development of effective adsorbents for kinetic separation of D<sub>2</sub>/H<sub>2</sub>.</p>

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Kinetic separation of hydrogen isotopes over lignin-rich biomass-derived carbon molecular sieves

  • 期刊论文

  • 发表日期：

    2026年4月28日

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  • Yi-Heng Song,
  • Yong-Sheng Wang,
  • Jia-Rui Gu,
  • Wen-Jing Ding,
  • Feng-Cheng Yang,
  • Guang-Ping Hao,
  • An-Hui Lu

摘要

Heavier hydrogen, deuterium, is widely used in isotope tracing, neutron scattering, and fusion reactions. Adsorptive separation of hydrogen isotopes (D2/H2) attracts increasing interest, which is mainly based on the kinetic quantum sieving (KQS) effect at low temperature. However, the effective KQS effect requires precise pore regulation and is beyond that of common molecular separation. Herein, we report on one kind of biomass-derived carbon molecular sieve that allows D2 transport freely but shows an evident diffusion barrier for H2, hence effectively separating D2 from the D2/H2 mixture. Such molecular sieving micropores are created in lignin-rich biomass-derived carbons by transforming cellulose components to slit-type carbon micropores and lignin to a pore size modifier. At 77 K, when entering the sieve-type slit, the diffusion rate of D2 is 1.8 times that of H2; thus, the concentration of D2 in the recovered gas from our molecular sieving carbon is approximately 10% higher than that from conventional microporous carbons. Aspen adsorption simulations indicate that D2 can be enriched to 90.1% from 1.0% D2/H2 mixture within 12 successive cycles following a two-bed cryogenic pressure swing adsorption process. The results are useful to advance the development of effective adsorbents for kinetic separation of D2/H2.