Abstract
The reactivity and surface chemistry of charcoal determine its combustion behavior, and these properties depend on the source of the original wood, production conditions, and treatment. Here we studied the properties of charcoal derived from lilac (Syringa vulgaris). Its reactivity was tested by isothermal and nonisothermal thermogravimetric analysis and differential scanning calorimetry in air and nitrogen. The free radical concentration was determined by measuring the electron spin resonance of fresh charcoal, after washing with HCl, and after degassing in air with or without nitrogen. We found that lilac is highly reactive, igniting at 250–300 °C with peak combustion at 320–520 °C. The quantity of oxygen consumed and heat released during oxidation increased with temperature. The free radical concentration in the untreated charcoal was 5.29 × 1018 spins/g, compared to 3.49 × 1019 spins/g after acid washing, 7.06 × 1019 spins/g after exposure to air, and 3.75 × 1017 spins/g after degassing with nitrogen ...
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