Effect of SO2 on the simultaneous removal performance of diesel soot and NOx over Pd doped La0.9Sr0.1MnO3 perovskite type catalysts
YANG Li1, ZHU Shu-wei1, SHU Xin-qian1, WANG Su-jian2, DENG Zeng-she2
1. School of Chemical & Environmental Engineering, China University of Mining & Technology, Beijing 100083, China;
2. Shaanxi Coal and Chemical Industry Group Company, Xi'an 710065, China
The perovskite catalyst La0.9Sr0.1Mn0.03Pd0.97O3 doped with noble metal Pd was prepared by citrate method. The effects of noble metal Pd dopant on the morphology structure of perovskite and the NOx conversion, and the mechanism of SO2 on the NOx removal performance of 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 increased the specific surface area of the original catalyst, created a suitable place for NO contact, and improved the NO conversion of the catalyst effectively. The catalyst La0.9Sr0.1Mn0.97Pd0.03O3 has a weak sulfate phase after reacting in an SO2 atmosphere, indicating that sulfur resulted in a certain degree deactivation to the catalyst. The conversion efficiency of NOx was maintained above 80% and the temperatures of soot combustion is 353℃ in the presence of a lower concentration of SO2. When the concentration of SO2 increased, the temperatures of soot combustion increased to 368℃ and the conversion efficiency of NOx was only at 67%.
杨丽, 朱淑维, 舒新前, 王苏健, 邓增社. SO2对Pd掺杂La0.9Sr0.1MnO3催化剂去除NOx和碳烟的影响[J]. 中国环境科学, 2018, 38(2): 516-522.
YANG Li, ZHU Shu-wei, SHU Xin-qian, WANG Su-jian, DENG Zeng-she. Effect of SO2 on the simultaneous removal performance of diesel soot and NOx over Pd doped La0.9Sr0.1MnO3 perovskite type catalysts. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(2): 516-522.
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