Hydrogen isotope sorption and recovery by a nonevaporable getter combined with a chemical compressor material

Abstract

Articles you may be interested inInvestigations of a method for determining pumping speed and sorption capacity of nonevaporable getters based on in situ calibrated throughput J. Vac. Sci. Technol. A 29, 051602 (2011); 10.1116/1.3626535 Divacancies and the hydrogenation of Mg-Ti films with short range chemical order Appl. Phys. Lett. 96, 121902 (2010); 10.1063/1.3368698 Efficient combining of ion pumps and getter-palladium thin films Problems of determining true equilibrium pressures of hydrogen getters over a wide range of getter temperature and hydrogen sorptionDue to the spreading use of hydrogen isotopes in many advanced fields of physics such as nuclear fusion, there is an increasing interest in devices able to sorb, store, and release these gases safely and controllably. In some cases there is also the requirement to purify the gas during the same adsorption-desorption process. A way to obtain this is to use a nonevaporable getter, which is able to sorb H2 isotopes reversibly and permanently sorb active gases, combined with a chemical compressor material (usually U). The present investigation refers particularly to a combination of getter materials with chemical compressors based on La-Ni-AI and Zr-Fe-V alloys. The nonevaporable getter sorbs H2 isotopes in the temperature range of 20-400 ·C, at low pressures, and in a second stage, on heating, releases these gases at higher pressures allowing sorption by the chemical compressor at room temperature. Subsequent heating (200-400 ·C) of the compressor provides a hydrogen isotope source at a substantially constant pressure of around 1 atm. The characteristics of these compressor alloys in terms of isotope equilibrium pressure, physicalchemical properties, and their use at defined pressures and temperatures are discussed, together with anticipated practical operation modes.

Degradation study of ZrNiH1.5 for use as actuators in gas gap heat switches

“…However, it was not until the 1960s that hydrides of intermetallic alloys were systematically studied [1,2] to identify alloys or compounds suitable for hydrogen fuel storage, chemical heat pumps or hydrogen compressors. Other metal-hydrogen systems have been used to recover hydrogen isotopes at pressures below 100 Pa [3][4][5][6], as getter materials in vacuum systems [7,8], or to remove residual gases from helium-hydrogen gas streams [9]. A few metal hydrides have been also considered as reversible vacuum pumps in gas gap heat switches [10,11].…”

Control Materials of Hydrogen Concentration in Micro Environment and Their Summary of Application

“…Hydrogen absorption capacity of carbon nanofibers whose diameter is between 90nm-125nm can be up to about 10 wt% after ethanol dispersion and hydrochloric acid. Doni et al [27] reported that the highest hydrogen storage capacity of carbon nanofibers is 10wt% after making carbon nanofiber to open and removing impurity gas adsorbed on the surface of the fiber. Perevezentsev et al [28] have measured that carbon nanofibers can store about 10wt% hydrogen too.…”