Kinetic study and synergistic interactions on catalytic CO2 gasification of Sudanese lower sulphur petroleum coke and sugar cane bagasse

In this study the effects of iron chloride (FeC1(3)) on the CO2 gasification kinetics of lower sulphur petroleum coke (PC) and sugar cane bagasse (SCB) via thermogravimetric analyser (TGA) were investigated. The FeC1(3) loading effects on the thermal behaviour and reactivity of CO2 gasification of PC were studied. The possible synergistic interaction between the PC and SCB was also examined. Then the homogeneous model or first order chemical reaction (01) and shrinking core models (SCM) or phase boundary controlled reactions (R-2 and R-3) were employed through Coats-Redfern method in order to detect the optimum mechanisms for the catalytic CO2 gasification, describe the best reaction behaviour and determine the kinetic parameters. The results showed that the thermal behaviour of PC is significantly affected by the FeC1(3) loading. Among various catalyst loadings, the addition of 7 wt% FeC1(3) to PC leads to improve the PC reactivity up to 39% and decrease the activation energy up to 22%. On the other hand, for char gasification stage of SCB and blend, the addition 5 wt% FeC1(3) improved their reactivities to 18.7% and 29.8% and decreased the activation energies to 10% and 17%, respectively. The synergistic interaction between the fuel blend was observed in both reaction stages of the blend and became more significant in the pyrolysis stage. For all samples model R-2 shows the lowest values of activation energy (E) and the highest reaction rates constant (k). Finally, model R-2 was the most suitable to describe the reactions of non-catalytic and catalytic CO2 gasification.(C) 2016 Brazilian Metallurgical, Materials and Mining Association. Published by Elsevier Editora Ltda. This is an open access article under the CC BY-NC-ND license