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

The influence mechanism of SO 2 on the NO x removal performance of a La 0.9 Sr 0.1 Mn 0.97 Pd 0.03 O 3 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 NO x contact, reducing the ignition temperature of soot and improving the NO x , C 3 H 6 and CO conversion of the catalyst effectively. Although the catalyst La 0.9 Sr 0.1 Mn 0.97 Pd 0.03 O 3 forms a stable and irreversible sulphate after reacting in a high concentration of SO 2 (300 ppm) atmosphere, it retains a high removal efficiency of NO x . High NO x removal efficiency of the catalyst La 0.9 Sr 0.1 Mn 0.97 Pd 0.03 O 3 in a high concentration of SO 2 (300 ppm) atmosphere.