The Li+-(H2)n n=1-3 complexes are investigated through infrared spectra recorded in the H-H stretch region (3980-4120 cm-1) and through ab initio calculations at the MP2/aug-cc-pVQZ level. The rotationally resolved H-H stretch band of Li+-H2 is centered at 4053.4 cm-1 [a -108 cm-1 shift from the Q1(0) transition of H2]. The spectrum exhibits rotational substructure consistent with the complex p...

Introduction The molecular sieving of isotopes has long been considered impossible, as they are of essentially identical size and shape. However, for light isotopes such as H2 and D2, quantum effects can lead to sufficiently large differences in de Broglie wavelengths at cryogenic conditions to make their molecular sieving possible in nanoporous materials having pores of molecular dimension. Wh...

Membranes have been used for gas separation for quite some time but have seen major growth during the 90’s [1]. For many industrial applications involving gas streams, it is important that membranes resist high temperatures and corrosive environments. As in Table 1, organic membranes are not heat resistant at high temperatures while zeolite membranes have pore sizes too large to separate gases ...

Investigators Shingo Kazama, Ph.D. Group Leader, Chief Researcher, Chemical Research Group, RITE Katsunori Yogo, Ph.D. Senior Researcher, Chemical Research Group, RITE Teruhiko Kai, Ph.D. Senior Researcher, Chemical Research Group, RITE Ikuo Taniguchi, Ph.D. Senior Researcher, Chemical Research Group, RITE Kazuya Goto, Ph.D. Senior Researcher, Chemical Research Group, RITE Shuhong Duan, Ph.D. R...

Pervaporation and gas separation performances of polymer membranes can be improved by crosslinking or addition of metal-organic frameworks (MOFs). Crosslinked copolyimide membranes show higher plasticization resistance and no significant loss in selectivity compared to non-crosslinked membranes when exposed to mixtures of CO2/CH4 or toluene/cyclohexane. Covalently crosslinked membranes reveal b...

The main goal of this work was to synthesize and evaluate the effect of dehydration temperature on the potential application of hydroxy sodalite zeolite membrane. Hydroxy sodalite zeolite membranes were synthesized via direct hydrothermal method onto a tubular alumina support without seeding in a hot air oven. The synthesized membranes were characterized by X-ray diffraction (XRD) and scanning ...