In situ investigation of Diesel soot combustion over an AgMnO_x catalyst

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• 作者：N. Guilhaume ; ^{Nolven.Guilhaume@ircelyon.univ-lyon1.fr} ; B. Bassou ; G. Bergeret ; D. Bianchi ; F. Bosselet ; A. Desmartin-Chomel ; B. Jouguet ; C. Mirodatos
• 关键词：Diesel soot ; Soot combustion ; Mechanism ; Ag&ndash ; Mn mixed oxide ; In-situ XRD ; Oxygen isotopic exchange
• 刊名：Applied Catalysis B ; Environmental
• 出版年：2012
• 期刊代码：4_09263373
• 类别：ce
• 出版时间：30 May, 2012
• 卷：119-120
• 期：Complete
• 页码：287-296
• 文件大小：1194 K

摘要

An AgMnO_x catalyst (3.5 wt.%Ag) incorporating silver ions in a Mn₂O₃ phase exhibits high performances for soot oxidation below 300 掳C. Its structural and redox properties have been investigated under reaction conditions using in situ XRD and DTA-TGA measurements. The catalyst appears unmodified during soot combustion experiments under oxygen, but in the absence of oxygen the soot is stoichiometrically oxidised by lattice oxygen leading to catalyst bulk reduction according to the steps Mn₂O₃ 鈫?#xA0;Mn₃O₄ 鈫?#xA0;MnO.

The isotopic reaction product composition (C¹⁶O₂, C¹⁸O¹⁶O, C¹⁶O₂, C¹⁶O and C¹⁸O) obtained during soot combustion experiments under ¹⁸O₂ reveals that the reaction follows a redox mechanism, in which the transfer of lattice oxygen from the catalyst to the soot is responsible for the soot ignition at low temperature.