Study On The Anti-sulfur Formance And The Formation Of The Scr Catalyst Withacid Modified Mn-Co-Ce/TiO₂-SiO₂ At Low Temperature

NOx is one of the most important air poll utants. The flue gas from the burning power plant has a large number of NOx, so the flue gas denitration methods attract more attention. Selective catalytic reduction(SCR)is considered to be an effective technology for the removal of NO x emitted from burning power plant, and the denitrification NOx removal efficiency can be more than 90%. In this paper, we studied the catalysts in SCR technology.Mn-Co-Ce/Ti O2 catalyst has demonstrated to be highly active for low-temperature SCR reaction. It is a potential medium-low temperature NH3-SCR catalyst. However, the catalyst has low sulfur resistance, vulnerable to SO2 poisoning. Mn-Co-Ce/Ti O2-Si O2-SO42- catalyst was prepared by replacing the support of Ti O2 with Ti O2-Si O2 complex oxides and supfating the catalyst. The catalyst not only has excellent low-temperature SCR catalytic activity but also has a strong anti-sulfur performance. The effects of the three metal load ratio, different concentration of SO42- sulfating sulphation calcinating temperature and the SO2 concentration on the catalytic activity were studied. As Mn:Co:Ce was 5:2:1, calcination at 300? for 3 hours, supfating with 0.1 mol/L sulfuric acid, SO2 concentration was 90 ppm, catalyst can keep high activity and high sulfur resistance at low temperature. The characterization methods confirm that the catalyst has good porosity and oxidation, acti ve component uniform load, no crystals formed.For industrial application, the powder catalyst must be prepared by the molding. In this paper the honeycomb shaped catalyst was chose for its high activity a certain degree of mechanical propert ies. By changing the contents of the additives, it was demonstrated that when the amount of glass fiber is 15%, binder addition is 20%, water content is 25%, the catalyst Mn-Co-Ce/Ti O2-Si O2-SO42- has the strongest mechanical strength. The catalytic activity tests indicated that the addition of the molding promoter d id not have a great influence on the catalytic performance and sulfur resistance for the catalysts. By investigating the catalytic activi ty under the different conditions, the results show that the catalyst showed the best activity under the inlet NO concentration of 0.15%, the volume space velocity of 20 000 h-1 and ammonia ratio of 1. Characterization of the catalysts confirmed that the a dditive has effect on the physical properties of honeycomb catalysts but no effect on chemical properties of the catalysts.These studies have improved the sulfur resistant performance of the catalyst by the sulfating method and optimize powder catalyst mo lding conditions and reaction conditions, subsequently providing supports to industrial application.