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Characteristics of adsorption and desorption of hydrogen on multi-walled carbon nanotubes

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氢气在碳纳米管基材料上的吸附_脱附特性.pdf (709.1Kb)
Date
2002
Author
Zhou, ZH
周振华
Wu, XM
武小满
Wang, Y
王毅
Lin, GD
林国栋
Zhang, HB
张鸿斌
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  • 化学化工-已发表论文 [14469]
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Abstract
Storage capacities of H-2 in a kind of multi-walled carbon nanotubes (MWCNTs) and its corresponding system modified with K+ salt were measured using volumetric method, and characteristics of adsorption and desorption of hydrogen on MWCNTs were studied by means of temperature-programmed desorption (TPD) method. The results showed that the storage capacities of H-2 in the purified MWCNTs could reach 1.51% (mass fraction) under condition of room temperature and 9.0 MPa, with adsorption of similar to99% of the H-2 being reversible. A comparative study indicated that the modification of the K+ salt to the MWCNTs did not improve its storage capacity of hydrogen, but led to elevating of desorption temperature of adsorbed hydrogen H-2(a) to a certain extent; in addition, the K+ modification resulted also in changing of surface property of the MWCNTs from original hydrophobicity to hydrophilicity. The products desorbed on H-2/MWCNTs involved exclusively H-2 at T less than or equal to 723 K, and main part of H-2 and small amount of CH4, C2H4, and C2H2 at T greater than or equal to 773 K; whereas on H-2/K+' -MWCNTs, H2O was also involved in the desorbed products, in addition to H-2 and small amount of C, C-2-hydrocarbons. The adsorption of H-2 on the MWCNTs-based materials is in the two models: associative (molecular state) and dissociative (atomic state).
Citation
ACTA PHYSICO-CHIMICA SINICA,2002,18(8):692-698
URI
https://dspace.xmu.edu.cn/handle/2288/12346

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