Engineering a CoMnO nanocube core catalyst through epitaxial growth of CoAlO hydrotalcite shell nanosheets for efficient elimination of propane

In this work, we successfully designed a core-shell structured CoMnO x @Co x Al 1 catalyst for the catalytic combustion of propane (C 3 H 8 ). Novelly, Al ions were introduced to form CoAl layered double hydroxides (CoAl-LDH) shells at the CoMnO x interface through a hydrothermal in situ growth domain-limiting mechanism. We observed that the nanocubic core of CoMnO x derived from the CoMn-PBA precursor and the multilayer hierarchical structure of hydrotalcite CoAlO x nanosheets were successfully constructed. Considering the effect of the Co/Al molar ratio on the structure of the hydrotalcite shell, we modulated the Co content. Consequently, the activity of the catalyst gradually increased and then decreased with an increase in the Co content. The CoMnO x @Co x Al 1 catalysts showed higher activity, stability and water resistance than CoMnO x . The TOF (Co+Mn) of CoMnO x @Co x Al 1 was much higher than that of CoMnO x at 220 °C. Strong interactions at the core-shell interface significantly increased the oxygen activation capacity and oxygen mobility, which accelerated the cleavage of the C-H bond and significantly improved the catalytic performance. DFT calculations reveal that CoMnAlO 4 with (100) planes possesses outstanding adsorption and activation capabilities for C 3 H 8 . TPSR confirmed the distribution of the reaction products, identifying the final products as CO 2 and H 2 O. This efficient and stable catalytic system offers valuable insights for designing high-performance catalysts aimed at the complete decomposition of C 3 H 8 . In this work, we successfully designed a core-shell structured CoMnO x @Co x Al 1 catalyst for the catalytic combustion of propane (C 3 H 8 ).