Catalytic oxidation properties and characterization of $LaSrCo_{0.9}(B'_{0.1}O_4(B'= Mn, Fe, Ni, Cu)$ mixed oxides

Abstract

Using a polyacrylamide gel method, a series of $LaSrCo_{0.9}(B'_{0.1}O_4(B'= Mn, Fe, Ni, Cu)$ mixed oxides were prepared and their catalytic activity was studied with CO and $C_3H_8$ oxidations as a testing reaction. The results show that the specific effects of B' ions on CO and $C_3H_8$ oxidations depend on their category. In comparison to $LaSrCoO_4$ catalyst, the activity of $LaSrCo_{0.9}Ni_{0.1}O_4$ catalyst for CO and $C_3H_8$ oxidations is higher, while only lower activity is obtained for Mn, Fe or Cu-doped catalysts. The information derived from TPD, XRD and iodometry experiments shows that the increase in oxidation activity of $LaSrCo_{0.9}Ni_{0.1}O_4$ catalyst towards CO and $C_3H_8$ oxidation can be related to the increases in $O_2$-adsorption quantity, $CO_2$-desorption quantity, oxygen vacancies and lattice distortion due to the adulteration of nickel. Further investigation shows that the apparent activation energy of $LaSrCo_{0.9}Ni_{0.1}O_4$ towards CO oxidation is lower than that of $LaSrCoO_4$.