Insights into heat management of hydrogen adsorption for improved hydrogen isotope separation of porous materials

doi:10.1016/j.jmst.2020.09.044

Abstract

Abstract:

Separating high-purity hydrogen isotopes from their mixture still remains a huge challenge due to almost the identical physicochemical properties. Much importance has been attached to tune microstructure of porous materials, while heat management during hydrogen isotope separation tends to be ignored. Herein, a porous material 5A molecular sieve (5A) is mixed with graphene (GE) under ball grinding to enhance its thermal conductivity for hydrogen isotope separation. The thermal conductivity increases from 0.19 W m^-1 K^-1 of neat 5A, 0.75 W m^-1 K^-1 of 5A/GE2 (2 wt% GE) to 1.23 W m^-1 K^-1 of 5A/GE8. In addition, introducing GE into 5A promotes hydrogen adsorption and D₂/H₂ adsorption ratio. 5A/GE2 shows the highest D₂ adsorption capacity (5.40 mmol/g) and the largest D₂/H₂ adsorption ratio (1.07) among the composites. It also displays a high efficiency of heat transfer that contributes to a low energy consumption due to the shortened cycle time during hydrogen isotope separation. This work offers new insights into material design for improved hydrogen isotope separation, which is greatly crucial to scientific and industrial applications, such as fuel self-sustaining in fusion reactors.

Key words: Hydrogen isotope separation, Hydrogen adsorption, Thermal conductivity, Porous material, Graphene

Nan Sun, Pei-Long Li, Ming Wen, Jiang-Feng Song, Zhi Zhang, Wen-Bin Yang, Yuan-Lin Zhou, De-Li Luo, Quan-Ping Zhang. Insights into heat management of hydrogen adsorption for improved hydrogen isotope separation of porous materials[J]. J. Mater. Sci. Technol., 2021, 76: 200-206.

Figures/Tables 7

Fig. 1. Heat management concept of material design for hydrogen isotope separation.

Fig. 2. SEM images of the cross section of (a) neat 5A, (b) 5A/GE2, (c) 5A/GE4, (d) 5A/GE6, (e) 5A/GE8 and (f) GE, respectively.

Fig. 3. Thermal responses of the samples with various graphene loadings. (a) Thermal conductive properties. (b) The enhancement ratio of thermal conductivity for the samples in comparison with the neat 5A. (c) Schematic illustration of thermal imaging tests. (d) Infrared thermal images. (e) Temperature profiles of the sample surfaces during heating process.

Fig. 4. Equilibrium adsorption isotherms of 5A composites. H2 (a) and D2 (b) adsorption capacity with various pressures at 77 K. Adsorption capacity (c) and D2/H2 adsorption ratio (d) under 1 bar at 77 K.

Fig. 5. H2 (open symbols) and D2 (filled symbols) adsorption isotherms for 5A (a) and 5A/GE2 (b) at various temperatures.

Fig. 6. Isosteric adsorption heat of H2 and D2 adsorption on 5A/GE2.

Fig. 7. Temperature profiles of neat 5A and 5A/GE2 during heating.

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