The effect of near-complete deoxygenation and polar species removal on deposition 3 propensity of a Jet A-1 fuel type, with marginal thermal oxidative stability was studied 4 in a laboratory scale approach. The fuel deoxygenation was carried out via nitrogen 5 purging and two types of bespoke zeolites were used separately in a packed bed reactor 6 for partial polar separation. The treated fuel samples were assessed individually for 7 deposition propensity, using "High Reynolds Thermal Stability(HiReTS)" test device. 8 It was found that when the concentration of hydroperoxides in fuel is relatively high, 9 polar removal is more effective way than the fuel deoxygenation in reducing carbona-10 ceous deposits.

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The effect of reactive sulfur removal from a Jet A-1 fuel with marginal thermal 3 stability on surface deposition propensity is reported. The sulfur removal was achieved 4 through adsorptive treatment of the fuel with activated carbon. The treated fuel 5 was assessed for surface deposition propensity using a High Reynolds Thermal Stabil-6 ity (HiReTS) test device. It was found that activated carbon has a strong adsorption 7 capacity for removal of reactive sulfur and Fe components from the fuel. This resulted 8 in a substantial reduction of surface deposition propensity of the Jet A-1 fuel. 9 Density Functional Theory(DFT) was used to investigate the role of reactive sulfur and 10 Fe on thermal oxidative stability. Mechanistic pathways for intervention of these class 11 of species with hydroperoxides are proposed.