Catalytic oxidation of NO with O₂ over FeMnO_x/TiO₂: Effect of iron and manganese oxides loading sequences and the catalytic mechanism study

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• 作者：Mengying Zhang^a ; ^b ; Caiting Li^a ; ^b ; ^{ctli@hnu.edu.cn" class="auth_mail} ; ^{ctli3@yahoo.com" class="auth_mail} ; Long Qu^a ; ^b ; Mengfan Fu^a ; ^b ; Guangming Zeng^a ; ^b ; Chunzhen Fan^a ; ^b ; Jinfeng Ma^a ; ^b ; Fuman Zhan^a ; ^b
• 关键词：NO oxidation ; FeMnOx/TiO2 ; Loading sequences ; Mechanism
• 刊名：Applied Surface Science
• 出版年：1 May, 2014
• 年：2014
• 卷：300
• 期：Complete
• 页码：58-65
• 全文大小：1441 K

文摘

FeMnO_x/TiO₂ with different iron and manganese oxides adding orders were prepared through isovolumetric impregnation and tested for catalytic oxidation of NO with O₂. It was found that the sample obtained from one-step impregnation method had better catalytic activity. The excellent activity was attributed to higher surface area, lower crystalline of manganese oxides, abundant Mn³⁺, Fe³⁺ and chemisorbed oxygen species on the surface. Furthermore, effects of loading sequences on FeMnO_x/TiO₂ catalysts were investigated. The study showed that Fe and Mn would affect each other and change the surface physicochemical properties of FeMnO_x/TiO₂ when they were loaded step-by-step. In addition, the inhibiting effect of H₂O on catalytic activity was reversible while the conversion of NO recovered to 40% when SO₂ was cut off. XPS analysis between used and fresh catalysts revealed the electron transfer between Feⁿ⁺ and Mnⁿ⁺ ions in FeMnO_x/TiO₂. Possible reaction mechanism was put forward by comprehensive analysis of XPS and FT-IR results.