摘要
目的为提升氢燃料电池汽车(FCV)用氢气质量,解决氢气中痕量卤化物杂质难以准确定量的技术问题。方法以“碱液+还原剂”作为吸收液,建立了离子色谱法测定FCV用氢气中卤化物的分析方法。当有氯气杂质存在时,单独的水或碱液作为吸收液均无法实现氯气的完全吸收。还原剂硫代硫酸根在碱性条件下可以将次氯酸根全部还原成氯离子,提高氯气的吸收效率。结果以“NaOH+S_(2)O_(3)^(2-)”作为吸收液,氯气的吸收效率可达91.0%,氯化物混合物的吸收效率均为92.6%~115.9%。低含量的氯化氢和氯气样品的吸收效率在80.0%以上,两次平行试验测定值的相对偏差均小于10%。氯化氢和氯气检出限分别为0.014μmol/mol和0.007μmol/mol。结论该方法可以满足FCV用氢气中卤化物的检测要求,所采集的4种不同来源的FCV用氢气中卤化物杂质均低于GB/T 37244—2018《质子交换膜燃料电池汽车用燃料氢气》的限值。
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+S_(2)O_(3)^(2-)"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 0.014μmol/mol and 0.007μmol/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.
作者
刘雅琼
万伟
王亚敏
高永杰
张祎玮
徐广通
Liu Yaqiong;Wan Wei;Wang Yamin;Gao Yongjie;Zhang Yiwei;Xu Guangtong(SINOPEC Research Institute of Petroleum Processing Co.,Ltd.,Beijing,China)
出处
《石油与天然气化工》
CAS
CSCD
北大核心
2023年第4期100-104,共5页
Chemical engineering of oil & gas
基金
国家重点研发计划“燃料电池车用氢气质量检测和在线监测技术开发”(2019YFB1505004)。
