Abstract
Sulfur-containing compounds (SCCs) are the most abundant heteroatomic organic species (HOS) in petroleum fuels. This study investigates the dynamics of SCCs in surrogate fuel systems, focusing on their oxidation stability, reactivity, and interactions. An analysis of eleven selected SCCs, spanning both reactive (thiols, sulfides, and disulfides) and nonreactive (thiophenes and benzothiazole) species, was conducted at 140 °C. The investigation delves into reaction and degradation mechanisms, exploring resulting products, binary mixtures of reactive SCCs for potential interactions, and multicomponent SCC systems to understand nuanced interaction. Findings reveal unique reaction pathways in single-component SCCs, synergetic and antagonistic effects in binary mixtures, and substantial decreases in reaction rates in all multicomponent systems. Moreover, SCCs expedited antioxidant consumption, highlighting their pivotal role in fuel stability and degradation. The study contributes valuable insights into SCC dynamics, advocating further exploration of HOS’s interactions for enhanced fuel formulation and stability testing strategies.
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