Separation dynamics of hydrogen isotope gas in mesoporous and microporous adsorbent beds at 77 K: SBA-15 and zeolites 5A, Y, 10X

Xiao Zhong Chu, Zhi Peng Cheng, Xin Xin Xiang, Ji Ming Xu, Yi Jiang Zhao, Wei Guang Zhang, Jin Shun Lv, Ya Ping Zhou, Li Zhou, Dong Kyu Moon, Chang Ha Lee

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Abstract

The separation of a hydrogen isotope mixture on porous materials was studied using equilibrium and breakthrough experiments. The adsorption equilibria of H2 and D2 on SBA-15 with mesopores and molecular sieves 5A, Y, and 10X with micropores were measured at 77 K using the volumetric method. The breakthrough experiments of a H2 and D 2 mixture in each adsorbent bed were carried out at various conditions of flow rate and pressure. The equilibrium ratio of D2 to H2 on mesoporous molecular sieves was larger than the ratio on microporous molecular sieves (SBA-15 > 10X > Y > 5A), but the difference among the adsorbents decreased with increases in pressure. On the other hand, the order of breakthrough separation factor showed the opposite result (SBA-15 < 10X < Y < 5A). The breakthrough separation factors for zeolite 10X was approximately equal to the equilibrium ratio of D2 to H2 at the corresponding partial pressures, whereas zeolites 5A and Y showed higher breakthrough separation factors than their equilibrium ratios. In SBA-15, the separation factors from breakthrough results were even smaller than the corresponding equilibrium ratio. In the microporous adsorbent with a limited pore size (zeolite 5A in the study), the diffusion mechanism contributed to the separation of hydrogen isotope gases as one of key factors.

Original languageEnglish
Pages (from-to)4437-4446
Number of pages10
JournalInternational Journal of Hydrogen Energy
Volume39
Issue number9
DOIs
Publication statusPublished - 2014 Mar 18

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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    Chu, X. Z., Cheng, Z. P., Xiang, X. X., Xu, J. M., Zhao, Y. J., Zhang, W. G., Lv, J. S., Zhou, Y. P., Zhou, L., Moon, D. K., & Lee, C. H. (2014). Separation dynamics of hydrogen isotope gas in mesoporous and microporous adsorbent beds at 77 K: SBA-15 and zeolites 5A, Y, 10X. International Journal of Hydrogen Energy, 39(9), 4437-4446. https://doi.org/10.1016/j.ijhydene.2014.01.031