Low-Temperature Selective Catalytic Reduction of NO with NH3 over Fe-Ce-Ox Catalysts

摘要

In this study, we used a simple impregnation method to prepare Fe–Ce–Ox catalysts and tested them regarding their low-temperature (200–300 ?C) selective catalytic reduction (SCR) of NO using NH3. We investi-gated the effects of Fe/Ce molar ratio, the gas hourly space velocity (GHSV), the stability and SO2/H2O resistance of the catalysts. The results showed that the FeCe(1:6)Ox (Ce/Fe molar ratio is 1:6) catalyst, which has some ordered parallel channels, exhibited good SCR performance. The FeCe(1:6)Ox catalyst had the highest NO conversion with an activity of 94–99% at temperatures between 200 and 300 ?C at a space velocity of 28,800 h-1. The NO con-version for the FeCe(1:6)Ox catalyst also reached 80–98%between 200 and 300 ?C at a space velocity of 204,000 h-1. In addition, the FeCe(1:6)Ox catalyst demonstrated good stability in a 10-h SCR reaction at 200–300 ?C. Even in the presence of SO2 and H2O, the FeCe(1:6)Ox catalyst exhibited good SCR performance.