fig2

Figure 2. (A) CH₄ conversion (X_CH4), H₂ productivity (H2_pro), supplied power (P) and (B) C₂H₂, C₂H₄ and C₂H₆ selectivity as a function of reaction temperature and TOS on the MESOC+-1 (R0) catalyst as a function of temperature and TOS under direct IH; (C) CH₄ conversion (X_CH4), H₂ productivity (H2_pro), supplied power (P) and (D) C₂H₂, C₂H₄ and C₂H₆ selectivity on the same carbon catalyst as a function of temperature and TOS under indirect JH. The methane flow rate is set at 60 mL/min corresponding to a WHSV of 900 mL_CH4/g_catalyst/h for the experiments presented in (A) and (B); (E) Zoom of the CMD catalytic performance, expressed in terms of methane conversion, under indirect JH mode at 1,000 °C showing the continuous deactivation slope; (F) Arrhenius plots and activation energy (E_a) recorded on the carbon catalysts operated under IH and JH mode and some representative results taken from the literature^[60,61]. This calculation is based on the initial rate of CMD; (G) Digital photo showing the MESOC+ catalyst at work and the heavy hydrocarbons condensed (yellow, indicated by arrow) at the exit of the reactor operated under IH mode. TOS: Time-on-stream; IH: induction heating; JH: Joule heating; WHSV: Weight hourly space velocity; CMD: catalytic decomposition of methane.