Effects of B-site substitution on the surface adsorption properties and catalytic activities of La0.8Sr0.2(Mn1−xCox)O3

In this study, surface adsorption capabilities and corresponding catalytic activities of perovskite-type La0.8Sr0.2(Mn1−xCox)O3 (x = 0, 0.2, 0.4, 0.6, 0.8, 1.0) oxides with controlled surface areas of 3–4 m2 g−1 were investigated. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS) were used to examine the surface adsorption property of perovskite oxides. The catalytic activity of La0.8Sr0.2(Mn1−xCox)O3 on methane conversion was investigated via gas chromatography (GC) in the temperature range of 400–700 °C under a fixed methane-to-oxygen ratio (CH4/O2) of 1.5. According to our investigation, the surface adsorption characteristics were improved with the increase of cobalt content in the B-site of La0.8Sr0.2(Mn1−xCox)O3. Such improvements consequently enhanced the overall conversion efficiency of methane.

Figure optionsDownload high-quality image (114 K)Download as PowerPoint slideResearch highlights▶ The intensity of the O1s signal at 530.7–531.4 eV increases as temperature increases. ▶ The intensity of the O1s signal at 530.7–531.4 eV increases as Co content increases. ▶ Oxygen adsorption increases with the increase of Co content in La0.8Sr0.2(Mn1−xCox)O3. ▶ Substitution of Mn with Co enhanced the overall conversion efficiency of methane.