Yu Lei, Liu Bo, Wang Pucheng, Liu Shuai, Sheng Junjie, Ao Yinyong
Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China.
Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang, 621900, China.
J Chromatogr A. 2025 Sep 27;1759:466247. doi: 10.1016/j.chroma.2025.466247. Epub 2025 Jul 24.
1,4-Bis(phenylethynyl)benzene blended with an activated carbon-supported palladium catalyst has been demonstrated as an effective hydrogen scavenger in reducing hydrogen gas accumulation within vacuum-sealed and hermetically closed systems. Accurate determination of the hydrogen mass fraction in reacted 1,4-bis(phenylethynyl)benzene (DEB) is essential for guiding the replacement of hydrogen-absorbing materials. In this study, a novel method for determining the hydrogen mass fraction in reacted DEB was developed. First, the reaction products of DEB with hydrogen gas were isolated and characterized using gas chromatography-mass spectrometry (GC-MS). A correlation between the peak areas of the reaction products and the saturation level of DEB was established. The hydrogen mass fraction in the reacted DEB was precisely determined based on the relationship between DEB saturation and hydrogen content. Furthermore, the effect of O₂ on the hydrogen uptake of DEB was investigated using the developed method. The results demonstrate that this method exhibits high detection sensitivity and accuracy for determining the hydrogen mass fraction in reacted DEB, offering a reliable approach for monitoring hydrogen absorption in such systems.
1,4-双(苯乙炔基)苯与活性炭负载的钯催化剂混合,已被证明是一种有效的氢气清除剂,可减少真空密封和密闭系统内的氢气积聚。准确测定反应后的1,4-双(苯乙炔基)苯(DEB)中的氢质量分数对于指导吸氢材料的更换至关重要。在本研究中,开发了一种测定反应后DEB中氢质量分数的新方法。首先,使用气相色谱-质谱联用仪(GC-MS)对DEB与氢气的反应产物进行分离和表征。建立了反应产物的峰面积与DEB饱和度之间的相关性。基于DEB饱和度与氢含量之间的关系,精确测定了反应后DEB中的氢质量分数。此外,使用所开发的方法研究了O₂对DEB吸氢的影响。结果表明,该方法在测定反应后DEB中的氢质量分数时具有高检测灵敏度和准确性,为监测此类系统中的氢吸收提供了一种可靠的方法。