Gas Chromatographic Separation of Hydrogen Isotopes on Molecular Sieves

Thermodynamics of reversible gas adsorption on alkali-metal exchanged zeolites—the interplay of infrared spectroscopy and theoretical calculations

“…Eqn (9) shows that at a temperature T = z, DG1 has a constant value for the six hydrogen-zeolite systems considered, i. 5; details about experimental measurements can be found elsewhere.…”

“…Gas separation using zeolites (and other porous adsorbents) can be used, inter alia, for oxygen separation from air, [1][2][3][4][5] hydrogen and CO separation from a variety of industrial feedstocks, 6,7 ethylene recovery from natural gas, 8 and hydrogen isotope (deuterium and tritium) separation by cryogenic gas chromatography. 9,10 Regarding gas storage, means for safe and cost effective storage and transport of hydrogen (and methane) are currently being sought, in view of the potential use of these gases as an alternative energy source at a time when increasing worldwide demand for energy is placing strain on petroleum supplies. Among the potential solutions being investigated, 11 an attractive possibility is reversible gas adsorption on a microporous material.…”

Applicability of Pd–Cu alloy to self-developing gas chromatography of hydrogen isotopes

“…The gas chromatographic separation is one of the promising methods for isotope separation because of simplicity of operation and construction, high separation efficiency. The conventional gas chromatographic separation of hydrogen isotopes is based on the isotope effects on physical adsorption by inert materials such as molecular sieves near 77 K [2]. It is not easy, however, to apply this method to large scale tritium handling systems, since it requires a huge amount of liquid nitrogen as coolant.…”

Efficient hydrogen isotopic analysis with Cu–Fe/ZSM-5 zeolite as a cryogenic chromatographic stationary phase

“…15,16 On the basis of these advantages, preliminary studies were launched to explore the hydrogen isotope analysis performances of 3A, 4A, and 5A zeolites as gas chromatography stationary phase. 17 A long resolution time was required while using pure zeolites, and physically mixing metallic oxides with zeolites made it difficult to further understand isotope analysis.…”