Abstract
Air pollution caused by diesel soot emission, is a serious environmental issue. In order to prevent the soot being released into the atmosphere, the catalyzed combustion of the soot trapped in diesel particulate filter (DPF) is performed, normally at high temperature. Among different noble metal dopants, Ag is effective in decreasing the active temperature, which can catalyze graphitic oxidation by penetrating into bulk graphite. The optimum 5 wt% Ag loading in Ag-ZrO2NPs were reported earlier. In our previous study, we demonstrated the catalytic properties of Ag-ZrO2 nanoparticles (NPs) with optimum 0.9 wt% Ag loading, which showed its cost effectiveness when compared with the high cost of Ag noble metal. The catalytic oxidation peak position declined gradually 455 °C to 399 °C with corresponding sintered temperature from 400 °C to 800 °C respectively.In this study, further decrease in soot oxidation temperature (387 °C) was achieved by incorporating ceria into the Ag-ZrO2 system (Ag-CeZrO2). A facile hydrothermal synthesis method was utilized for preparation of Ag-CeZrO2 nanocomposites. After the incorporation of ceria to Ag-ZrO2 system, the tetragonal phase of ZrO2 was observed instead of multi phases (tetragonal and monoclinic) ZrO2. In the present study, the soot combustion behavior of Ag-ZrO2 and Ag-CeZrO2 catalysts is described in details..
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