Dissolved oxygen (DO) -induced jet fuel thermal oxidation and deposition formation severely compromise the reliability of jet fuel systems in high-speed aircraft. Herein, hydrazine compounds were investigated as oxygen scavengers for oxygen removal from jet fuel for the first time. Carbohydrazide (CH), phenylhydrazine (PH), and cyclohexylhydrazine (CHH) achieved deoxygenation of 33. 2%, 62. 6%, and 57. 3%, with apparent activation energies of 63. 06, 18. 61, and 9. 53 kJ·mol–1, respectively. Furthermore, a series of CH@ZIF-8 deoxygenation composites were constructed by immobilizing CH within the highly porous support ZIF-8. Dynamic deoxygenation experiments were performed in a stainless-steel column packed with CH@ZIF-8 pellets. The effects of CH loading, temperature, flow rate, and bed depth were thoroughly investigated. A CH loading of 30 wt % and an operating temperature of 140 °C were identified as optimal, balancing deoxygenation activity and suppression of fuel autoxidation. Increased bed depth prolonged DO breakthrough time by providing more active sites and longer contact time, while higher flow rates shortened breakthrough time. Moreover, the Thomas, Yoon–Nelson, Adams–Bohart, and Modified Dose–Response models, as well as Aspen Adsorption simulation, were employed to describe the dynamic deoxygenation behavior with correlation coefficients of 0. 990, 0. 990, 0. 979, 0. 998, and 0. 987, indicating good agreement with experimental results. Thermal oxidation stability tests at 350 °C demonstrated that deoxygenation using CH@ZIF-8₃0 reduced the thermal oxidation deposition of n-undecane from 1497. 37 μg to 156. 33 μg, corresponding to an inhibition efficiency of 89. 6%, and exhibited significant potential for enhancing jet fuel thermal stability.
Chen et al. (Wed,) studied this question.