Synthesis of large surface area MnO_x-CeO_2 using CTA and its catalytic activity for soot combustion(<Feature> Innovative Ceramic Materials and Technologies for Global Environmental Protection)
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概要
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Large surface area (n)MnO_x-(1-n)CeO_2 (0*n*1) catalysts were synthesized using a hybrid organic/inorganic route and characterized by XRD, N_2 adsorption and catalytic test. The addition of aqueous ammonia to mixed solutions of cerium and manganese nitrates in the presence of CTAB (cetyltrimethyl ammonium bromide) yielded gelatinous hydrous Ce-Mn oxide/CTA composites (MnCe_<CTA>). As calcined MnO_x-CeO_2 (n=0.25, 450℃) exhibited a largest surface area of 223m^2/g, which is quite larger than 80m^2/g for the corresponding oxide prepared from conventional co-precipitation route (MnCe_<CP>) . As synthesized MnO_x-CeO_2 catalysts were tested for soot oxidation by O_2. The catalytic activity of MnCe_<CP> was highest at n=0.25-0.5, whereas the catalytic activity of MnCe_<CTA> was lower and increased monotonically with an increase of the Mn content (n). The different catalytic behavior seems to be associated with the activity of surface oxygens and lower oxidation state of MnCe_<CTA>.
- 社団法人日本セラミックス協会の論文
- 2008-02-01
著者
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MACHIDA Masato
Department of Materials Science and Technology, Graduate School of Engineering Scineces, Kyushu Univ
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Zhang Dong-jie
Department Of Nano Science And Technology Graduate School Of Science And Technology Kumamoto Univers
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Machida Masato
Dep. Of Nano Sci. And Technol. Graduate School Of Sci. And Technol. Kumamoto Univ.
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Machida Masato
Department Of Nano Science And Technology Graduate School Of Science And Technology Kumamoto Univers
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Ikeue Keita
Dep. Of Nano Sci. And Technol. Graduate School Of Sci. And Technol. Kumamoto Univ.
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Ikeue Keita
Department Of Nano Science And Technology Graduate School Of Science And Technology Kumamoto Univers
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Murata Yuichiro
Department Of Mechanical Engineering Faculty Of Science And Technology Keio University
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Murata Yuichiro
Department Of Nano Science And Technology Graduate School Of Science And Technology Kumamoto Univers
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KISHIKAWA Koji
Department of Nano Science and Technology, Graduate School of Science and Technology, Kumamoto Unive
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Kishikawa Koji
Department Of Nano Science And Technology Graduate School Of Science And Technology Kumamoto Univers
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Machida Masato
Department Of Applied Chemistry And Biochemistry Graduate School Of Science And Technology Kumamoto University
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Ikeue Keita
Department Of Applied Chemistry And Biochemistry Graduate School Of Science And Technology Kumamoto University
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