Structural Insight into La0.5Ca0.5Mn0.5Co0.5O3 Decomposition in the Methane Combustion Process

Perovskite-like solid solution La0.5Ca0.5Mn0.5Co0.5O3 was tested during the total methane combustion reaction. During the reaction, there is a noticeable decrease in methane conversion, the rate of catalyst deactivation increasing with an increase in temperature. The in situ XRD and HRTEM methods show that the observed deactivation occurs as a result of the segregation of calcite and cobalt oxide particles on the perovskite surface. According to the TGA, the observed drop in catalytic activity is also associated with a large loss of oxygen from the perovskite structure.

Automated summary

Perovskite-like solid solution La0.5Ca0.5Mn0.5Co0.5O3 was tested for total methane combustion reaction, showing a noticeable decrease in methane conversion and increased catalyst deactivation with temperature rise. In situ XRD and HRTEM methods revealed deactivation was due to segregation of calcite and cobalt oxide particles on the perovskite surface. TGA results also linked decreased catalytic activity to oxygen loss from the perovskite structure.