| Summary: | Hydrogen specifications for different scenarios are various. Based on national standards for China, a comparison of hydrogen specification standards is discussed in this paper, including specification standards for industrial hydrogen, pure hydrogen, high pure hydrogen, ultrapure hydrogen, hydrogen for electronic industry and hydrogen for PEM FCVs. Hydrogen purity for electronic industry is greater than that for industrial hydrogen, pure hydrogen and hydrogen for PEM FCVs. Specifications of general contaminants in hydrogen for electronic industry, including H2O, O2, N2, CO, CO2 and total hydrocarbons, are stricter than that in hydrogen for PEM FCVs. Hydrogen purity for PEM FCVs is less than that for electronic industry and pure hydrogen. However, contaminants in hydrogen for PEM FCVs are strict. Contaminants in hydrogen for PEM FCVs should include not only H2O, O2, N2, CO, CO2, Ar and total hydrocarbons, but also helium, total sulfur compounds, formaldehyde, formic acid, ammonia, halogenated compounds and particulates.
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