Catalytic Performance of Carbon Smoke over Ag-LSCF Composite Catalysts

Abstract

To improve the catalytic performance of La_0.6Sr_0.4Co_0.2Fe_0.8O₃ (LSCF) towards carbon soot, we utilized the impregnation method to incorporate Ag into the prepared LSCF catalyst. We conducted a series of characterization tests and evaluated the soot catalytic activity of the composite catalyst by comparing it with the LaCoO₃ group, LaFeO₃ group, and catalyst-free group. The results indicate that the Ag-LSCF composite catalyst exhibits the highest soot catalytic activity, with the characteristic temperature values of 376.3, 431.1, and 473.9 °C at 10 %, 50 %, and 90 % carbon soot conversion, respectively. These values are 24.8, 20.2, and 23.1 °C lower than those of the LSCF group. This also shows that LSCF can improve the catalytic activity of soot after compounding with Ag, and reflects the necessity of using catalysts in soot combustion reaction. XPS characterization and BET test show that Ag-LSCF has more abundant surface-adsorbed oxygen species, larger specific surface area and pore volume than LSCF, which also proves that Ag-LSCF has higher soot catalytic activity.

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