Summary
Oxidation evolutions of construction, porosity and reactivity properties of 4 mannequin carbons (PU, S160, N330 and R250) with totally different preliminary reactivity had been studied. Outcomes confirmed that modifications within the porosity and nanostructure properties as an alternative of preliminary properties considerably affected the soot reactivity throughout the soot oxidation course of. Two high-reactivity soot surrogate samples, i.e., PU and S160, initially offered turbostratic disordered crystallites, leading to increased reactivity on the early oxidation stage. Oxidation primarily proceeded inwardly in a peeling trend, and extra disordered inner crystallites had been uncovered after oxidized, barely growing the reactivity of PU and S160. Two low reactivity soot surrogate samples, i.e., N330 and R250, initially exhibited the everyday core–shell construction. The oxidation charges of N330 and R250 had been decrease than that of PU and S160 as a consequence of extra ordered exterior crystallites and fewer floor oxygen content material on the early oxidation stage. As soon as oxygen penetrated the particle core, many pores had been generated. Subsequent, the particle turned hole by way of inner burning of the extra reactive inner carbon on the late oxidation stage. After 40% burnoff, these hole constructions promoted oxidation in each outward and inward instructions. Subsequently, oxidation charges of N330 and R250 considerably elevated.
