Paper-structured catalyst for catalytic NO_x removal from combustion exhaust gas

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• 作者：Hirotake Ishihara ; Hirotaka Koga ; Takuya Kitaoka ; Hiroyuki Wariishi ; Akihiko Tomoda ; Ryo Suzuki
• 关键词：Paper ; Fiber network ; Microstructure ; Composites ; Catalyst support ; Environment
• 刊名：Chemical Engineering Science
• 出版年：2010
• 出版时间：1 January 2010
• 年：2010
• 卷：65
• 期：1
• 页码：208-213
• 全文大小：924 K

文摘

Platinum/aluminum oxide (Pt/Al₂O₃) catalyst powders were successfully fabricated to give paper-like composites using ceramic fibers by a papermaking technique. As-prepared composites, called paper-structured catalysts, possessed a fiber-network microstructure on which the Pt/Al₂O₃ powders were scattered. The paper-structured catalysts were subjected to a catalytic reduction process of nitrogen oxides (NO_x), and demonstrated a higher performance than the original Pt/Al₂O₃ powders and a commercial honeycomb catalyst. A simple mixture of catalyst powders and inorganic fibers was not effective, suggesting that the characteristic porous microstructure (average pore size: ca. porosity: ca. 70 % ) in the paper-structured catalyst possibly contributed to the efficient NO_x reduction. Besides, the paper-structured catalyst exhibited a quick response in the catalytic NO_x reduction at a rapidly increasing reaction temperature as compared to the honeycomb catalyst. The paper composite is flexible, lightweight and easy to handle; thus the paper-structured catalyst is expected to be a promising catalytic material for exhaust gas purification.