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The influence mechanism of SO2 on the NOx removal performance of a La0.9Sr0.1Mn0.97Pd0.03O3 catalyst was investigated in this paper using X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, and the transient response method. Results show that incorporating the noble metal Pd into the catalyst increases the specific surface area of the original catalyst, creating a suitable place for NOx contact, reducing the ignition temperature of soot and improving the NOx, C3H6 and CO conversion of the catalyst effectively. Although the catalyst La0.9Sr0.1Mn0.97Pd0.03O3 forms a stable and irreversible sulphate after reacting in a high concentration of SO2 (300 ppm) atmosphere, it retains a high removal efficiency of NOx.

rsc advances

Effect of high concentration SO2 on four-way catalytic performance of La0.9Sr0.1Pd0.03Mn0.97O3 perovskite catalysts