Summary
Oxidation evolutions of construction, porosity and reactivity properties of 4 mannequin carbons (PU, S160, N330 and R250) with completely 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 larger reactivity on the early oxidation stage. Oxidation primarily proceeded inwardly in a peeling vogue, and extra disordered inside 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 attributable to 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 inside burning of the extra reactive inside 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.
