Study on Sulfur and Water Resistance of Marine Ruthenium Catalyst

A series of ruthenium-based catalysts were prepared by impregnation method and co-precipitation method, and applied to the catalytic oxidation of NO in the fast SCR for NOx removal in marine diesel engines. The effects of different supports and preparation methods on their catalytic activity and anti-sulfur and water-resistant properties were investigated. The Brunanuer-Emmett-Teller (BET), temperature programmed reduction (TPR) method, oxygen temperature programmed desorption (O2 -TPD) method, and X-ray diffraction (XRD) were used to analyze and determine the specific surface area, redox performance and characterization of the samples and the dispersion of ruthenium on the surface. The modified Ru/Al-CeZr-2 catalyst had significantly improved its low temperature activity and sulfur resistance and water resistance. The activity remained around 40% with SO2 and H2 O existed for 120min. After sulfur and water cut off, the active energy recovered to 52%, which could meet the conditions of fast SCR. It provided an idea for the industrialization process of ship SCR technology.