Membranes of Palladium Alloys for Ultrapure Hydrogen Production

Рошан, Н. Р.; Горбунов, С. В.; Chistov, E. M.; Karelin, F. R.; Кутербеков, К. А.; Abseitov, E. T.

doi:10.1134/s2075113320050287

Cited by 4 publications

(2 citation statements)

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“…Cryogenic separation reaches a hydrogen purity of only 99%, and its shortcomings include its high energy consumption and being unsuitable for small scale plants. Most of the membrane systems can reach a moderate hydrogen purity of 90–95% and moderate recovery rate of 85–90%, although some inorganic membranes (such as palladium alloy) can achieve ultrapure hydrogen (≥99.9999 vol %) . With the diversification of the hydrogen production and purification methods, the hydrogen product may show different purity.…”

Section: Introductionmentioning

confidence: 99%

“…Most of the membrane systems can reach a moderate hydrogen purity of 90−95% and moderate recovery rate of 85−90%, 24 although some inorganic membranes (such as palladium alloy) can achieve ultrapure hydrogen (≥99.9999 vol %). 25 With the diversification of the hydrogen production and purification methods, the hydrogen product may show different purity. For the purpose of gas purification, the membrane technology has been widely used, in which some partial permeable membranes 26 are used to screen the undesired gas molecules.…”

Section: Introductionmentioning

confidence: 99%

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A Conceptional Constant-Pressure Integrated Hydrogen Purification and Storage System by Combining the Modified Graphene and Carbon Nanotube: A Molecular Dynamics Analysis

Zhang

et al. 2021

Energy Fuels

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A large-capacity hydrogen storage system, which is also able to purify the hydrogen during storage, is appealing and bears significance for the mobile hydrogen use systems which require highly pure hydrogen, since it improves the adaptability of these systems to hydrogen fuels of different purity grades. Inspired by the fact that carbon nanotubes (CNTs) and nanoporous graphene (NPG) membranes have the ability to adsorb and separate gases, respectively, a concept for a constant-pressure integrated hydrogen purification and storage system composed of these two carbon-based materials is proposed. In this integrated system, hydrogen is stored by the adsorption of CNTs and purified by the two-layer nanoporous graphene membranes during the permeation driven by hydrogen concentration difference at constant pressure. The molecular dynamics simulation for the purification and storage processes was carried out with the open source software LAMMPS (Largescale Atomic/Molecular Massively Parallel Simulator), by which the purification efficiency and hydrogen storage capacity under different working conditions were investigated. The results showed that the preferable working parameters for the purification and storage processes are different, and thus the determination of theses parameters should strike a balance between their effects on both storage and purification processes. Through comparative studies, it was found that the system can obtain the best performance of purification and hydrogen storage at the feed-hydrogen temperature, adsorption temperature, and working pressure of 300 K, 60 K, and 15 MPa, respectively, with the storage density and hydrogen purity of 4.57 wt % and 95% (75% before purification), respectively. The integrated hydrogen storage and purification system proposed in this paper, although just a concept, can provide a theoretical reference for designing large-capacity hydrogen storage systems for equipment which requires highly pure hydrogen.

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Section: Introductionmentioning

confidence: 99%