Investigation of SO2 tolerance of Ce-modified activated semi-coke based catalysts for the NO + CO reaction. Issue 84 (22nd November 2017) - Wang, Zhiqiang
Abstract : The SO2 tolerance mechanism of Ce-modified activated semi-coke based catalysts for the NO + CO reaction. Abstract : Activated semi-coke was loaded with Fe–Co mixed oxides and doped with an optimized amount of cerium oxides. This prepared catalyst exhibited excellent NO removal (deNO) activity, and also showed outstanding SO2 resistance at 250 °C. To understand the SO2 tolerance mechanism, the catalysts were characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, in situ Fourier-transform infrared spectroscopy, H2 -temperature-programmed reduction, and SO2 -temperature-programmed desorption, as well as CO–deNO activity testing under different conditions. The results indicate that the Ce (molar ratio = 0.1) doped onto the Fe–Co binary oxide catalysts would promote the generation of Ce2 (SO4 )3 . This generation could prevent the active metal oxides from being poisoned by SO2 . Furthermore, this kind of sulfate would weaken the interaction between SO2 and NO, so that the adsorbed NO will have a better opportunity to react with CO.