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김진걸,임정균,Kunkul Ryoo,전지용,유승준,김성수 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-
In order to improve NOx storage and reduction (NSR) kinetics over Pt/Co/Ba/Al2O3 catalyst in thepresence of SO2, Fe was added as a promoter to inhibit sulfation. A NOx analyzer was used tomeasure theNOx concentration of the gas phase and in-situ diffuse reflectance infrared Fourier transform (DRIFT)spectroscopy was dedicated to analyze the interaction between the adsorbed reactive species from thegas phase and solid catalyst surface. NSR results showed that the addition of Fe to Pt/Co/BaO/Al2O3increased the NOx uptake. The presence of Fe inside catalyst contributed to enhancing the ability ofresistance to SO2 exposure. In situ DRIFT study confirmed that Fe played a role as an active inhibitor tosulfation based on the decreased intensity of band at 1120 cm 1. An isothermal temperature reduction(ITR) experiment at 300 8C showed that Fe would work to improve the reduction ability of stored NOx inthe lean cycle and catalyst regeneration during the rich cycle.