Refined data for the carbon dioxide gasification of activated charcoal BAU-A containing supported nickel

Abstract

In the laboratory reactor described in our previous work [1], the equilibrium concentrations are not reached in the СО2 flow rate range examined. For this reason, we used CO + СО2 mixtures of various com positions to determine the equilibrium concentra tions, and for each mixture we determined the temper ature at which the rates of the forward and reverse reactions are equal. However, because of the low rate + 2 С CO 2CO. of the forward reaction at low temperatures and because of the rate of the reverse reaction being low compared to that of the forward reaction over a wide temperature range, the equilibrium temperatures were overestimated and the equilibrium CO concentrations in the noncatalytic reaction were underestimated. This prompted us to improve the procedure of determining the equilibrium concentrations in the slow noncatalytic process by using gas recirculation through the reactor (Fig. 1). The CO + CO2 gas mix ture was circulated in the system until the equilibrium was attained both from the forward reaction side and from the reverse reaction side. The equilibrium con centrations thus determined in the 750–980°C range are plotted in Fig. 2. However, these data for the non catalytic reaction still turned out to be below the same data for the catalytic reaction. This might be due to the experimental error, the variation of the thermody namic functions among charcoal samples, and the for mation of filamentous structures in the catalytic reac tion. Further investigation is necessary to conclusively Refined Data for the Carbon Dioxide Gasification of Activated Charcoal BAU A Containing Supported Nickel