锰
氧化物
氧化锰
材料科学
氮氧化物
煅烧
程序升温还原
X射线光电子能谱
吸附
化学工程
空间速度
选择性
催化氧化
混合氧化物
沸石
隐锰铁矿
作者
Panagiotis G. Smirniotis,Pavani M. Sreekanth,Donovan A. Peña,Robert G. Jenkins
摘要
A series of TiO2-, Al2O3-, and SiO2-supported manganese oxide catalysts were prepared, characterized, and catalytically tested for selective catalytic reduction (SCR) of NO with NH3 in the presence of excess oxygen at low temperatures (373−523 K). Various commercial supports were used in this study to find out the influence of surface area, support nature (acidic, basic), and crystalline phase on SCR activity. XRD studies reveal the presence of anatase and rutile phases for titania supports and the existence of γ-alumina in the case of alumina support. Silica support was amorphous. No independent lines corresponding to the crystalline MnO2 were observed on pure anatase and rutile samples. However, the presence of MnO2 was confirmed on other supports by XRD. BET surface area values suggest that specific surface area of the supports was decreased after impregnating with MnO2. The FT-IR and ammonia TPD studies indicate the presence of two types of acid sites on these catalysts, and the acidic strength of the...
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