Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470, Mülheim an der Ruhr, Germany.
ChemSusChem. 2022 Jul 21;15(14):e202200456. doi: 10.1002/cssc.202200456. Epub 2022 May 30.
Biodiesel is an important building block in renewable energy transformation. The main issue is that during storage biodiesel will undergo transformation processes that can lead to molecular changes, which then can cause applicational problems such as severe motor damage. To prevent this, a detailed understanding of the involved molecules and the emerging aging products is necessary. Biodiesel samples were stored for up to 12 months to monitor molecular changes, and all mixtures were investigated by using ultrahigh-resolution mass spectrometry (HRMS) with electrospray ionization (ESI). The data revealed that during storage large numbers of oxygen atoms were incorporated into the fatty acid methyl esters (FAMEs). This process was dominant for the first quarter of aging but then became overshadowed by dimerization of oxygenated FAMEs. This means that there are two main pathways for aging in biodiesel: polyoxygenation and oligomerization. These findings greatly pin down the possible causes for sedimentation giving a solid foundation for aging inhibition development.
生物柴油是可再生能源转型的重要组成部分。主要问题是，在储存过程中，生物柴油会经历转化过程，导致分子发生变化，从而可能导致严重的发动机损坏等应用问题。为了防止这种情况发生，需要详细了解涉及的分子和新出现的老化产物。为此，将生物柴油样品储存长达 12 个月，以监测分子变化，并使用电喷雾电离（ESI）的超高分辨率质谱（HRMS）研究所有混合物。数据显示，在储存过程中，大量的氧原子被掺入脂肪酸甲酯（FAME）中。这一过程在老化的前四分之一时间占主导地位，但随后被氧化的 FAME 二聚化所掩盖。这意味着生物柴油中有两种主要的老化途径：多氧化和齐聚。这些发现极大地确定了生物柴油中沉淀的可能原因，为老化抑制的发展提供了坚实的基础。
