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

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

doi:10.1016/j.ijhydene.2014.01.031

Cited by 35 publications

(15 citation statements)

References 38 publications

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“…These values were in the range between the results of zeolites 5A and Y, but the saturated adsorption amounts, q (mol/kg), of H 2 and D 2 on CMS (4.83 and 4.91 mol/kg) were larger than those on SBA-15 (3.82 and 4.02 mol/kg) with higher surface area [24]. Thus, it was expected that the surface area itself had little influence on isotope adsorption equilibrium.…”

Section: Isotope Difference In Equilibrium Adsorptionmentioning

confidence: 58%

“…It was reported that the pore size of the adsorbent is the most important factor in separating the hydrogen isotope gas [24,25]. And one of the purposes in the study was to elucidate the effect of a wide pore size distribution of carbon material on the hydrogen isotopes separation.…”

Section: Experimental Apparatus and Operation Proceduresmentioning

confidence: 99%

“…It was reported that Ar is better than the other gases to measure a specific surface area and pore size distribution at 87 K, particularly for disordered carbon materials with narrow pores because of diffusional problems and pore mouth barriers [34][35][36]. On the other hand, the specific surface area of various microporous adsorbents was compared by using the N 2 BET method [24][25][26]. Furthermore, the surface area and the pore size of CMS were measured by the N 2 BET method in the hydrogen isotope study [21,37].…”

Section: Properties Of Cms Adsorbentmentioning

confidence: 99%

“…In addition, remarkable quantum effects between H 2 and D 2 at low temperature in carbon molecular sieve were reported by using a quasielastic neutron scattering method [23]. In the previous study, separation dynamics of hydrogen isotope gas were experimentally investigated using beds packed with mesoporous silica (SBA-15) and microporous zeolites (5A, Y, 10X) [24]. The separation factors from breakthrough results were even smaller than the corresponding equilibrium ratios in mesoporous adsorbent, while the diffusion mechanism in microporous adsorbents with a limited pore size contributed to improving the separation efficiency in hydrogen isotope gases.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, structural nanomaterials with uniform pore size distribution were commonly discussed in most experimental and theoretical studies [6,9,[12][13][14][17][18][19][21][22][23][24][25][26]. However, few of hydrogen isotope separation studies were found for adsorbents with wide pore size distribution even though many pelletized adsorbents used in industries have a wide pore size distribution.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Adsorption dynamics of hydrogen and deuterium in a carbon molecular sieve bed at 77K

Chu

Cheng

Zhao

et al. 2015

Separation and Purification Technology

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Section: Isotope Difference In Equilibrium Adsorptionmentioning

confidence: 58%

Section: Experimental Apparatus and Operation Proceduresmentioning

confidence: 99%

Section: Properties Of Cms Adsorbentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Adsorption dynamics of hydrogen and deuterium in a carbon molecular sieve bed at 77K

Chu

Cheng

Zhao

et al. 2015

Separation and Purification Technology

Self Cite

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Enhanced Thermal Conductivity of 5A Molecular Sieve with BNs Segregated Structures

et al. 2017

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5A molecular sieves have been widely used as adsorbents in cryogenic distillation for hydrogen isotope separation in fusion reactor engineering, but its low thermal conductivity is detrimental to the process stability. Improving the thermal conductivity of 5A molecular sieves is one of the most important goals for high-performance devices. Here, firm segregated structures with boron nitride sheets (BNs) are constructed around 5A molecular sieve particles. SEM results show 30 mm BNs tend to form the better networks in comparison with that of 0.12 mm BNs at 40 wt% loadings. It is further verified that BNs with the larger size promote the thermal conductivity. Meanwhile, the thermal conductivity increases with the increasing amounts of BNs. XRD and specific surface area results indicate that the sintering and the addition of BNs exert negligible effects on the structure of 5A molecular sieve. These results indirectly show 5A molecular sieve with BNs segregated structures is very likely to be used for the application of hydrogen isotopic separation. Besides, this work provides new insight into the construction of segregated structure in inorganic porous materials.

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Selectively enriching accessible quantum sieving sites in two‐dimensional carbons for D₂/H₂ kinetic separation

Wang,

Li,

Zheng

et al. 2024

AIChE Journal

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Separation of hydrogen isotopes (D2/H2) attracts wide interest due to its important applications, such as nuclear fusion. Kinetic quantum sieving‐induced separation over tailored nanoporous solids is a promising method; however, the dynamic separation often shows a transient feature, thus a low D2/H2 selectivity even at temperature below 50 K. Herein, we selectively enriched the accessible quantum sieving (AQS) sites in two‐dimensional carbons by chemically growing a pore‐narrowing layer. The spatial density of such AQS sites is 8.5 times higher than that of commercial carbon molecular sieves. The kinetic selectivity of D2/H2 reached 4.6 at 77 K. Column breakthrough experiments revealed that the dynamic D2/H2 separation was enhanced by such a nanopore design. Aspen simulation indicated that D2 was enriched to 93.1% within 11 pressure swing adsorption cycles with a 1% D2/99% H2 mixture as feed.

show abstract

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

Cited by 35 publications

References 38 publications

Adsorption dynamics of hydrogen and deuterium in a carbon molecular sieve bed at 77K

Adsorption dynamics of hydrogen and deuterium in a carbon molecular sieve bed at 77K

Enhanced Thermal Conductivity of 5A Molecular Sieve with BNs Segregated Structures

Selectively enriching accessible quantum sieving sites in two‐dimensional carbons for D₂/H₂ kinetic separation

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

Cited by 35 publications

References 38 publications

Adsorption dynamics of hydrogen and deuterium in a carbon molecular sieve bed at 77K

Adsorption dynamics of hydrogen and deuterium in a carbon molecular sieve bed at 77K

Enhanced Thermal Conductivity of 5A Molecular Sieve with BNs Segregated Structures

Selectively enriching accessible quantum sieving sites in two‐dimensional carbons for D2/H2 kinetic separation

Contact Info

Product

Resources

About

Selectively enriching accessible quantum sieving sites in two‐dimensional carbons for D₂/H₂ kinetic separation