“…Furthermore, considering the size of the coke and anode samples as well as the temperature of the reaction (at least 960°C), a gas concentration gradient could be created inside the samples [7,19,20]. Thus, the CO 2 reactivity of these samples could be affected by two main parameters: the chemical reactivity, influenced by the level of impurities and L C , and the mass transport limitations, influenced by the gas concentration gradient.…”