Catalytic soot oxidation by Ag/BaCeO3 having tolerance to SO2 poisoning

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概要

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• The effect of SO2 and NO on the catalytic oxidation of diesel particulate (soot) was studied over two Ce oxides, CeO2 and BaCeO3. Silver catalysts loaded on both Ce oxides exhibited the high activity, which was accelerated by the pretreatment in a flow of NO/O2 mixtures. The adsorption species in the form of NO2/NO3 should play a role of oxidizing agents for soot. However, the pretreatment of Ag/CeO2 in a flow of SO2/O2 mixtures caused significant deactivation. Strong adsorption of SO2 onto active site at the three-phase boundary between soot, Ag/CeO2 and the gas phase would be a reason for the deactivation. Ag/BaCeO3 was found to be a catalyst having much improved tolerance to SO2. The tolerance may be explained by the SO2 adsorption site residing apart from the catalytically active oxygen site.

• 公益社団法人 日本セラミックス協会の論文

著者

• MACHIDA Masato

  Department of Materials Science and Technology, Graduate School of Engineering Scineces, Kyushu Univ

• IKEUE Keita

  Department of Nano Science and Technology, Graduate School of Science and Technology, Kumamoto Unive

• KOBAYASHI Shintaro

  Department of Nano Science and Technology, Graduate School of Science and Technology, Kumamoto Unive

• Ikeue Keita

  Department Of Nano Science And Technology Graduate School Of Science And Technology Kumamoto Univers

• Machida Masato

  Department Of Applied Chemistry And Biochemistry Graduate School Of Science And Technology Kumamoto University

• Ikeue Keita

  Department Of Applied Chemistry And Biochemistry Graduate School Of Science And Technology Kumamoto University

• KOBAYASHI Shintaro

  Department of Nano Science and Technology, Graduate School of Science and Technology, Kumamoto University

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