Conversely, FeCo2O4/SiC-Pretrt shows a relatively lower surface area and pore volume than Co2FeO4/SiO2, which makes it lesser accessible during reactions at elevated temperatures. Co2FeO4/β-SiC (T), respectively (see Figure ). Here, both adsorption and dissociation of SO3 are exothermic processes. ∆𝐺 is negative for both systems, indicating that these systems are thermodynamically stable . ∆𝐺 comes out to be more negative for the Co2FeO4/β-SiC (T) system, which shows the high catalytic activity and stability of Co2FeO4/β-SiC (T).