Effect of Ce substitution on the structure and performance of three-dimensional ordered macropores La1-xCexCoO3 catalyst

3DOM LaCoO3 and a series of A-substituted perovskite catalysts 3DOM La1-xCexCoO3 were prepared by PMMA template-excess impregnation method. The effects of Ce substitution on the microstructure, surface properties and redox properties of perovskite oxides were analyzed by XRD, BET, SEM, XPS, H2-TPR and the removal of toluene by catalytic combustion in air, and the optimal substitution ratio was finally determined. It can be seen that the 3DOM La0·7Ce0·3CoO3 sample has a complete macroporous structure, high specific surface area (35.6 ​m2 ​g−1), high Co3+/Co2+ and Oads/Olatt concentrations, good low-temperature reducibility, and outstanding catalytic performance at WHSV ​= ​6000 ​mL/(g·h) (T50 ​= ​103 ​°C, T90 ​= ​204 ​°C). The results show that the excellent catalytic performance is closely related to the eminent morphology and structure of the catalyst, high surface adsorbed oxygen concentration and good reducibility. [Display omitted] •3DOM LaCoO3 and a series of A-substituted perovskite catalysts 3DOM La1-xCexCoO3 are prepared by PMMA template-excess impregnation method.•The difference in the amount of Ce substitution makes the catalyst morphology, surface properties, redox properties and catalytic performance also different.•3DOM La0·7Ce0·3CoO3 catalyst has a complete macroporous structure, large specific surface area (35.6 ​m2 ​g−1), high Co3+/Co2+ and Oads/Olatt concentrations, good low-temperature reducibility and shows excellent catalytic performance for toluene in catalytic combustion experiments, T50 ​= ​103 ​°C, T90 ​= ​204 ​°C at WHSV ​= ​6000 mL/(g·h).