Structural insight into la_0.5ca_0.5mn_0.5co_0.5o₃ decomposition in the methane combustion process

Perovskite-like solid solution La_0.5Ca_0.5Mn_0.5Co_0.5O₃ 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.