Morphology-Engineering Enhanced Catalytic Performance Improvement of Fe-Ca-Ox/TiO2 for 1,2-dichlorobenzene Oxidation

Abstract TiO2 is an important support material in gas-solid heterogeneous catalysis, while the morphology effect of TiO2 support has seldom been elucidated for polychlorinated aromatic hydrocarbons (PCAHs) oxidation. Here in, Fe-Ca-Ox/TiO2 catalysts supported with TiO2 nanorods (TiFe5Ca70-R), nanoparticles (TiFe5Ca70-P) and nanosheets (TiFe5Ca70-S) were employed in 1,2-dichlorobenzene oxidation. The results showed that TiFe5Ca70-S exhibited relatively high catalytic activity with T90% =322 °C compared with TiFe5Ca70-P (T90% =417 °C) and TiFe5Ca70-R (T90% =461 °C); meanwhile, TiFe5Ca70-S also showed good water resistance and stability (> 90% conversion for around 700 min.) than the other two catalysts. The improved catalytic performance of TiFe5Ca70-S can be mainly related to the sheet-like morphology of TiO2 support which provided the catalyst with abundant amount of surface oxygen and good low-temperature reducibility. The strong interaction between α-Fe2O3 and TiO2 and the synergic effect between CaCO3 and α-Fe2O3 also contributed to the good catalytic performance of TiFe5Ca70-S.