著者

Guo Yu Sakurai Makoto Kameyama Hideo MATSUYAMA AKIRA KUDOH YASUSHI

出版者

公益社団法人 化学工学会

雑誌

Journal of chemical engineering of Japan (ISSN:00219592)

巻号頁・発行日

vol.36, no.12, pp.1470-1479, 2003-12-01

参考文献数

21

被引用文献数

16 41

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A novel metallic monolith support was prepared by anodization, HWT (hot water treatment) and calcination. A commercial aluminum plate was anodized to form porous alumina films in the outer surfaces of the aluminum plate. In contrast to the anhydrous and amorphous alumina formed after anodization, the alumina in the anodized film with HWT was boehmite. The calcination after HWT made the boehmite film lose its hydrate water and rearrange into <I>&gamma;</I>-alumina. The HWT and calcination significantly enhanced the surface area of the support due to the formation of numerous micropores (radius <25 &Aring;). These new micropores were superimposed on the original skeleton structure to make up a binary-pore structure.<BR>The activities of Cu-Mn-CeO<SUB>x</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB>/Al and Pt/Al<SUB>2</SUB>O<SUB>3</SUB>/Al alumite catalysts for the SCR-HC of NO by propene were investigated under oxygen-rich conditions. At low temperatures, Pt/Al<SUB>2</SUB>O<SUB>3</SUB>/Al exhibited a higher activity for NO<SUB>x</SUB> removal than Cu-Mn-CeO<SUB>x</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB>/Al. However, a higher temperature (>623 K) made the activity of Pt/Al<SUB>2</SUB>O<SUB>3</SUB>/Al inferior to that of Cu-Mn-CeO<SUB>x</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB>/Al. In comparison with Pt/Al<SUB>2</SUB>O<SUB>3</SUB>/Al, Cu-Mn-CeO<SUB>x</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB>/Al had a lower N<SUB>2</SUB>O selectivity throughout the whole temperature range. The addition of SO<SUB>2</SUB> inhibited the activity of Pt/Al<SUB>2</SUB>O<SUB>3</SUB>/Al, and this activity decay was reversible. On the other hand, a dramatic promotional effect of SO<SUB>2</SUB> on reducing NO<SUB>x</SUB> was observed over Cu-Mn-CeO<SUB>x</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB>/Al, but this influence of SO<SUB>2</SUB> on the activity was irreversible.