Auto-Combustion Synthesis of Mn_1−xAg_xCo₂O₄ Catalysts for Diesel Soot Combustion

Abstract

The increase in diesel consumption has led to the proliferation of soot particles from diesel exhaust, resulting in pollution in the form of smog. To solve this problem, a series of Ag-doped Mn1−xAgxCo2O4 spinel catalysts were successfully prepared using an auto-combustion synthesis method that uses glucose as a fuel. X-ray diffraction and Fourier transform infrared spectroscopy analysis were used to analyse the phase structure of the as-prepared samples. The results reveal that the selected catalysts featured a spinel-type structure. Moreover, the catalytic activity of the catalysts for soot combustion was evaluated by temperature-programmed reaction analysis. The temperature required for soot combustion depended heavily on the Ag concentration in the Mn1−xAgxCo2O4 catalyst. The Mn0.8Ag0.2Co2O4 catalyst had a superior catalytic activity with a T90 of 399 °C and CO2 selectivity of 99.3%.

Keywords

• soot
• Mn_1−xAg_xCo₂O₄
• Ag
• auto-combustion synthesis