Ti元素改性ZrCo合金在CO杂质气氛中吸氢行为及影响机制

Effect of Ti modification on properties of hydrogenation of ZrCo in the presence of CO contaminant gas

摘要:

采用EDS和XRD表征了Ti改性ZrCo合金的相结构及表面元素分布,采用飞行时间二次离子质谱(TOF-SIMS)以及程控升温热解脱附(TPD)方法研究少量CO(1.05%vol.CO+98.95%vol.H2气氛)对Zr0.8Ti0.2Co合金氢化行为的影响及作用机制。结果表明：在纯氢环境下ZrCo合金和Zr0.8Ti0.2Co合金饱和吸氢时间分别少于2分钟和少于4分钟,饱和吸氢容量分别为1.8wt%和1.9wt%。而在含1.05%CO的氢中ZrCo合金和Zr0.8Ti0.2Co合金在2500min内均未能达到吸氢饱和,吸氢容量分别下降到0.91wt%和0.48wt%,Ti改性导致ZrCo合金在CO杂质气氛中的吸氢动力学性能下降。实验表明通过773K、0.5h热抽空处理可恢复至毒化前吸氢性能。

Abstract:

The phase structure and element distribution of surface of ZrCo alloys with Ti modification were investigated by EDS and XRD. Effect and mechanism of Ti modification on hydrogenation behavior of ZrCo alloys with poisoned by CO was investigated via TOF-SIMS and TPD. The results showed that the hydrogenation period of ZrCo and Zr0.8Ti0.2Co alloys are less than 2 minutes and 4 minutes under the pure hydrogen atmosphere, and the capacity of hydrogenation could reach 1.8wt% and 1.9wt%, respectively, whereas the capacity of hydrogenation of ZrCo and Zr0.8Ti0.2Co just obtained 0.91wt% and 0.48wt% within 2500 minutes in the presence of CO contaminant gas, which meant the hydriding kinetics of ZrCo decreased with Ti modification. And performance of posioned sample could revert with treatment of vaccuming at 773K for 0.5h