Contaminated hydrogen gas composition and its use as a reference for hydrogen fuels
AssigneesToyota Jidosha Kabushiki Kaisha, Npl Management Limited
InventorsWard Storms, Thomas Bacquart, Abigail Morris
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Abstract
The present invention relates to a hydrogen gas composition comprising specific gas contaminants at threshold limit values (as listed in the ISO 14687:2019 standard). The invention also concerns a metal cylinder such as an aluminium cylinder comprising a hydrogen gas composition according to the invention. The hydrogen gas composition of the invention may be used as a calibration composition and/or quality control composition for controlling hydrogen fuels.
Claims20
A hydrogen gas composition comprising the following gas contaminants in the following concentrations in a hydrogen gaseous matrix, expressed in μmol/mol with respect to the total number of moles of gas in the hydrogen gas composition as a whole:
- sulphur compound(s):
- at least 0.002 μmol/mol and at most 0.20 μmol/mol,
- formaldehyde (HCHO):
- at least 0.05 μmol/mol at most 0.50 μmol/mol,
- formic acid (HCOOH):
- at least 0.05 μmol/mol and at most 0.50 μmol/mol,
- ammonia (NH3):
- at least 0.050 μmol/mol and at most 0.50 μmol/mol,
- halogenated compound(s):
- at least 0.020 μmol/mol and at most 0.20 μmol/mol,
- the hydrogen gas composition comprising either ammonia (NH3) or formaldehyde (HCHO) but not ammonia and formaldehyde simultaneously.
Dependencies are inferred from the claim text.