Vol 6, No 7 (2015) > Chemical Engineering >

Adsorption Capacity and its Dynamic Behavior of the Hydrogen Storage on Carbon Nanotubes

Mahmud Sudibandriyo, Praswasti PDK Wulan, Prolessara Prasodjo



The potential of carbon nanotubes (CNTs)
produced in our laboratory to be used for hydrogen storage was tested in this
study. The test includes the determination of the hydrogen gas adsorption
capacity and the dynamics of the adsorption and desorption of hydrogen on CNTs at isothermal
temperature of 25oC and pressures of 0–1,000 psia. A similar test was also conducted on
commercial CNTs obtained from the Chinese Academy of Sciences for comparison.
The results showed that the hydrogen adsorption capacity of the local CNTs is
lower than that of commercial CNTs. At pressures around 960 psia, the
adsorption capacities of local and commercial CNTs are 0.09% and 0.13% weight,
respectively. In general, the hydrogen adsorption data of both the adsorbents
can be represented well by the Langmuir model, with less than 3% absolute
average deviation (AAD). The dynamics of adsorption and desorption can be represented
well by the Gasem and Robinson model with less than 2% AAD. The adsorption and
desorption processes on both local and commercial CNTs occurred very quickly.
At the highest pressure (960 psia), the adsorption and desorption equilibriums
on the local CNTs were reached in approximately 30 s, while on commercial CNTs,
they were reached in 2 s. The rates of the adsorption equilibriums on both
local and commercial CNTs increase at a higher pressure. In the desorption
process, while the equilibrium time is reached slightly faster at a higher
pressure on commercial CNTs, the time is almost similar at all pressures for
local CNTs.

Keywords: Adsorption; Carbon nanotubes; Desorption; Dynamics of adsorption and desorption; Hydrogen

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