Abstract:
Objective The study aims to improve the quality of hydrogen for hydrogen fuel cell vehicles (FCV), as well as solve the technical problem that trace halide impurities in hydrogen is difficult to be accurately quantified.
Methods A method for the determination of halides in hydrogen for FCV by ion chromatography was developed using "lye + reducing agent" as absorption solution. When chlorine impurities exist, neither water nor lye as absorbent solution could fully absorb chlorine gas. The reducing agent thiosulfate could completely reduce hypochlorite to chloride ion under alkaline condition and improve the absorption efficiency of chlorine gas.
Results With "NaOH + S2O32-" as the absorption solution, the absorption efficiency of chlorine gas reached 91.0%, and the absorption efficiencies of chloride mixture were 92.6%-115.9%. The absorption efficiencies of low concentration hydrogen chloride and chlorine gas samples were more than 80.0%, and the relative deviations of the two parallel tests values were less than 10%. The detection limits of hydrogen chloride and chlorine were 0.014 μmol/mol and 0.007 μmol/mol, respectively.
Conclusions The established method meets the requirements of halide detection in FCV. All of the halide impurities in hydrogen for FCV collected from four different sources were lower than the limit value of GB/T 37244-2018 Fuel specification for proton exchange membrane fuel cell vehicles—Hydrogen.
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