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Hydrogen purity analysis: Suitability of sorbent tubes for trapping hydrocarbons, halogenated hydrocarbons and sulphur compounds
RISE Research Institutes of Sweden, Materials and Production, Chemistry, Biomaterials and Textiles.ORCID iD: 0000-0002-4037-3106
RISE Research Institutes of Sweden, Materials and Production, Chemistry, Biomaterials and Textiles.
RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.ORCID iD: 0000-0001-5118-0150
VSL Dutch Metrology Institute, Netherlands.
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2020 (English)In: Applied Sciences, E-ISSN 2076-3417, Vol. 10, no 1, article id 120Article in journal (Refereed) Published
Abstract [en]

The ISO 14687-2 standard sets requirements for the purity of the hydrogen that is delivered at refuelling stations. These specifications cover a wide range of impurities and include challenging measurements, mainly due to the very low levels of the required detection limits and the need for "total" measurements (total hydrocarbons, total sulphur compounds, halogenated compounds). Most of the compounds belonging to the species are organic. Thermal desorption often coupled with gas chromatography is a common speciation method used to determine the content of organic impurities. However, no existing sorbent tubes are sufficiently universal to trap all possible impurities; depending on the sorbents and the sampling volume, some compounds may irreversibly adsorb or may break through. It is therefore necessary to evaluate sorbents for the compounds targeted at the level required. In this study, the suitability of sorbent tubes for trapping organic impurities in hydrogen was investigated. Suitable sorbents were selected based on a literature review of suitable sorbent materials. Short-term stability studies for compounds among hydrocarbons, halogenated compounds and sulphurcompounds on the selected sorbents have then been performed for storage periods of two weeks since this is the period typically required to complete the collection, transport and analysis of hydrogen samples. The study clearly shows that the method is promising for total species, even through the results show that not all of the compounds belonging to the three total species to be analysed when performing hydrogen purity analysis can be quantified on one unique sorbent. A multibed sorbent consisting of Tenax TA (weak), Carboxen 1003 (medium), Carbograph 1 (strong) is shown to be a versatile sorbent suitable for the three "total species"; only a few compounds from each family would need to be analysed using other analytical methods. This method proposed here for total species will not only provide a sum of concentrations, but also an identification of which compound(s) is/are actually present in the hydrogen.

Place, publisher, year, edition, pages
MDPI AG , 2020. Vol. 10, no 1, article id 120
Keywords [en]
Fuel cells, Hydrogen, Hydrogen quality, Hydrogen vehicle, Sorbent, Thermal desorption
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-43948DOI: 10.3390/app10010120Scopus ID: 2-s2.0-85079132423OAI: oai:DiVA.org:ri-43948DiVA, id: diva2:1394657
Available from: 2020-02-19 Created: 2020-02-19 Last updated: 2020-02-20Bibliographically approved

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Arrhenius, KarineBüker, Oliver

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