The use of active carbons as cryosorbent

Day, Christian

doi:10.1016/s0927-7757(01)00630-6

Cited by 41 publications

(7 citation statements)

References 26 publications

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“…21 Using a technology developed and implemented at the Karlsruher Institut für Technologie, 22 activated charcoal has been applied to an aluminum carrier located inside the cryogenic beam pipe. The temperature is then raised to 350°C for a few hours to activate strips of nonevaporative getter ͑NEG͒ material ͑SAES St707͒ covering the inside walls of the beam pipe wherever possible, except inside the helium cooling rings.…”

Section: B Vacuum and Cryogenic Conceptmentioning

confidence: 99%

A cryogenic electrostatic trap for long-time storage of keV ion beams

Lange¹,

Froese²,

Menk³

et al. 2010

Review of Scientific Instruments

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We report on the realization and operation of a fast ion beam trap of the linear electrostatic type employing liquid helium cooling to reach extremely low blackbody radiation temperature and residual gas density and, hence, long storage times of more than 5 min which are unprecedented for keV ion beams. Inside a beam pipe that can be cooled to temperatures <15 K, with 1.8 K reached in some locations, an ion beam pulse can be stored at kinetic energies of 2-20 keV between two electrostatic mirrors. Along with an overview of the cryogenic trap design, we present a measurement of the residual gas density inside the trap resulting in only 2 x 10(3) cm(-3), which for a room temperature environment corresponds to a pressure in the 10(-14) mbar range. The device, called the cryogenic trap for fast ion beams, is now being used to investigate molecules and clusters at low temperatures, but has also served as a design prototype for the cryogenic heavy-ion storage ring currently under construction at the Max-Planck Institute for Nuclear Physics.

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Section: B Vacuum and Cryogenic Conceptmentioning

confidence: 99%

A cryogenic electrostatic trap for long-time storage of keV ion beams

Lange¹,

Froese²,

Menk³

et al. 2010

Review of Scientific Instruments

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“…5,6) In addition, the performance of gas adsorption in a large-scale cryosorption pump was experimentally investigated by the ITER group. 7,8) The basic adsorption and desorption mechanism and the isotherm of activated carbon for various gaseous molecules were investigated previously. 5,6,8,9) However, there is no analytical or experimental study on the adsorption and desorption behavior of multicomponent gas mixtures on the adsorbent.…”

Section: Introductionmentioning

confidence: 99%

“…7,8) The basic adsorption and desorption mechanism and the isotherm of activated carbon for various gaseous molecules were investigated previously. 5,6,8,9) However, there is no analytical or experimental study on the adsorption and desorption behavior of multicomponent gas mixtures on the adsorbent. In the present study, experimental results and analytical equations for the three-component gas adsorption and desorption of He, H 2 , and CH 4 are presented.…”

Section: Introductionmentioning

confidence: 99%

Mixed Desorption of He, H₂, and CH₄Adsorbed on Charcoal Maximally Cooled at 10K

Fukada

Terashita

2010

Journal of Nuclear Science and Technology

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Desorption rates of mixtures of He, H 2 , and CH 4 adsorbed on activated carbon placed in an enclosed vessel are determined under the condition where the temperature is elevated from 10K to room temperature. Activated carbon is selected because of its good adsorption performance at the cryogenic temperature. The carbon used in the present study is covered with or mesopores or micropores from 1 nm to 10 nm in diameter. The adsorption and desorption of their respective gases proceed independently, and desorption behavior of each component is well expressed in terms of a Langmuir-Freundlich isotherm. Since desorption curves under different heating conditions can be correlated to the same one on a (T-p t ) plot, it is considered that gas desorption proceeds under equilibrium condition between the adsorbent and gaseous phases. Two-or three-component desorption of He, H 2 , and CH 4 from activated carbon can be described using an extended multicomponent Langmuir-Freundlich isotherm without any correction. Desorption curves calculated for their respective gases are in comparatively good agreement with experimental data.

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“…Among many specific requirements for the best choice of cryosorbent materials, the adsorption capacity is certainly a discriminating factor. Though many types of cryosorbers have been tested in the past [2,3], active porous carbon is still the far most important cryosorbent material due to its high specific surface area and large pore volume [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

H2adsorption on multiwalled carbon nanotubes at low temperatures and low pressures

Barberio

Vasta

et al. 2008

Phys. Rev. ST Accel. Beams

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We present an experimental study on H 2 adsorption on multiwalled carbon nanotubes (MWCNTs) at low temperatures (12-30 K) and low pressures (2 Â 10 À5 Torr) using the temperature programmed desorption technique. Our results show that the molecular hydrogen uptake increases nearly exponentially from 6 Â 10 À9 wt: % at 24.5 K to 2 Â 10 À7 wt: % at 12.5 K and that the desorption kinetics is of the first order. Comparative measurements indicate that MWCNTs have an adsorption capacity about two orders higher than that of activated carbon (charcoal) making them a possible candidate as hydrogen cryosorber for eventual applications in accelerators and synchrotrons.

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The use of active carbons as cryosorbent

Cited by 41 publications

References 26 publications

A cryogenic electrostatic trap for long-time storage of keV ion beams

A cryogenic electrostatic trap for long-time storage of keV ion beams

Mixed Desorption of He, H₂, and CH₄Adsorbed on Charcoal Maximally Cooled at 10K

H2adsorption on multiwalled carbon nanotubes at low temperatures and low pressures

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The use of active carbons as cryosorbent

Cited by 41 publications

References 26 publications

A cryogenic electrostatic trap for long-time storage of keV ion beams

A cryogenic electrostatic trap for long-time storage of keV ion beams

Mixed Desorption of He, H2, and CH4Adsorbed on Charcoal Maximally Cooled at 10K

H2adsorption on multiwalled carbon nanotubes at low temperatures and low pressures

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Mixed Desorption of He, H₂, and CH₄Adsorbed on Charcoal Maximally Cooled at 10K