Effect of CO on NO oxidation over platinum based catalysts for hybrid fast SCR process.
The oxidation characteristics of NO over Pt/TiO2 (anatase, rutile) catalysts have been determined in a fixed bed reactor as a function of O2, CO and SO2 concentrations in the presence of 8% water. The conversion of NO to NO2 increases with increasing O2 concentration up to 12% and it levels off. This saturation effect is more pronounced over rutile-Pt/TiO2 (r-Pt/TiO2) than that of anatase-Pt/TiO2 (a-Pt/TiO2). The presence of CO increases NO oxidation significantly and this enhanced effect is more pronounced on a-Pt/TiO2 than that on r-Pt/TiO2 with increasing CO concentration at lower temperatures. The same effect is also observed on the catalysts with different Pt and tungsten oxide (WO3) loadings. With increasing Pt and WO3 loadings on TiO2 support (Pt-WO3/TiO2), formation of NO2 is high even at lower temperatures. The presence of SO2 significantly suppresses the oxidation of NO over both r-Pt/TiO2 and a-Pt/TiO2 catalysts but it is less pronounced due to low stability of sulfate on a-Pt/TiO2.
Irfan
Muhammad Faisal
MF
Department of Chemical and Biomolecular Engineering, Energy and Environment Research Center, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Republic of Korea.
Goo
Jeong Hoi
JH
Kim
Sang Done
SD
Hong
Sung Chang
SC
D002248:Carbon Monoxide / Q000737:chemistry*; D002384:Catalysis; D009585:Nitrogen Dioxide / Q000737:chemistry; D009589:Nitrogen Oxides / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D010984:Platinum / Q000737:chemistry*; D013458:Sulfur Dioxide / Q000737:chemistry; D013696:Temperature; D014025:Titanium / Q000737:chemistry
D009589:Nitrogen Oxides; D013458:Sulfur Dioxide; C009495:titanium dioxide; D010984:Platinum; D002248:Carbon Monoxide; D014025:Titanium; D009585:Nitrogen Dioxide; D010100:Oxygen