Regeneration of Sulfated MnOx鈥揅eO2鈥揂l2O3 Soot Oxidation Catalyst by Reduction with Hydrogen

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• 作者：Xiaodong Wu ; Hyeong-Ryeol Lee ; Shuang Liu ; Duan Weng
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：January 16, 2013
• 年：2013
• 卷：52
• 期：2
• 页码：716-721
• 全文大小：314K
• 年卷期：v.52,no.2(January 16, 2013)
• ISSN：1520-5045

文摘

MnO_x鈥揅eO₂鈥揂l₂O₃ mixed oxide catalyst, which is efficient for soot oxidation in NO + O₂ with T₅₀ = 437 掳C, shows a poor resistance to sulfur dioxide with T₅₀ raised to 534 掳C. The sulfated catalyst was treated in a reducing atmosphere (5% H₂/He) at different temperatures (500, 600, and 700 掳C). The catalysts were characterized by X-ray diffraction (XRD), Brunauer鈥揈mmett鈥揟eller (BET) analysis, infrared (IR) spectroscopy, thermogravimetric analysis (TGA), temperature-programmed decomposition (TPD) of sulfates, and temperature-programmed reduction (TPR) of hydrogen. The catalytic activities for soot and NO oxidation were evaluated using the temperature-programmed oxidation (TPO) process. The sulfates can be only partially removed by the reduction treatment at low temperatures, whereas the sintering of metal oxides turns to be a more important factor responsible for the deactivation of catalysts reduced at high temperatures. The optimized treatment temperature is 600 掳C, at which the reduced catalyst has a T₅₀ value of 466 掳C for soot oxidation.