Transfer and Reaction Performances of Selective Catalytic Reduction of N2O with CO over Monolith Catalysts

doi:10.1016/S1004-9541(13)60559-5

摘要/Abstract

摘要： This work tries to identify the relationship between geometric configuration of monolith catalysts, and transfer and reaction performances for selective catalytic reduction of N₂O with CO. Monolith catalysts with five different channel shapes (circle, regular triangle, rectangle, square and hexagon), was investigated to make a comprehensive comparison of their pressure drop, heat transfer Nu number, mass transfer Sh number and N₂O conversion. It was found that monolith catalysts have a much lower pressure drop than that of traditional packed bed, and for monolith catalysts with different channel shapes, pressure drop decreases in the order of regular triangle > rectangle > square > hexagon > circle. The order of Nu is in regular triangle > rectangle ≈ square>hexagon > circle, similar to that of Sh. N₂O conversion follows the order of regular triangle > rectangular ≈ square ≈ circle > hexagon. The results indicate that chemical reaction including internal diffusion is the controlling step in the selective catalytic reduction of N₂O removal with CO. In addition, channel size and gas velocity also have influence on N₂O conversion and pressure drop.

关键词: selective catalytic reduction, N₂O conversion, momentum transfer, heat transfer, mass transfer, monolith catalysts, mathematical modeling

Abstract: This work tries to identify the relationship between geometric configuration of monolith catalysts, and transfer and reaction performances for selective catalytic reduction of N₂O with CO. Monolith catalysts with five different channel shapes (circle, regular triangle, rectangle, square and hexagon), was investigated to make a comprehensive comparison of their pressure drop, heat transfer Nu number, mass transfer Sh number and N₂O conversion. It was found that monolith catalysts have a much lower pressure drop than that of traditional packed bed, and for monolith catalysts with different channel shapes, pressure drop decreases in the order of regular triangle > rectangle > square > hexagon > circle. The order of Nu is in regular triangle > rectangle ≈ square>hexagon > circle, similar to that of Sh. N₂O conversion follows the order of regular triangle > rectangular ≈ square ≈ circle > hexagon. The results indicate that chemical reaction including internal diffusion is the controlling step in the selective catalytic reduction of N₂O removal with CO. In addition, channel size and gas velocity also have influence on N₂O conversion and pressure drop.

Key words: selective catalytic reduction, N₂O conversion, momentum transfer, heat transfer, mass transfer, monolith catalysts, mathematical modeling

代成娜, 雷志刚, 王玉丽, 张润铎, 陈标华. Transfer and Reaction Performances of Selective Catalytic Reduction of N₂O with CO over Monolith Catalysts[J]. Chinese Journal of Chemical Engineering, 2013, 21(8): 835-843.

DAI Chengna, LEI Zhigang, WANG Yuli, ZHANG Runduo, CHEN Biaohua. Transfer and Reaction Performances of Selective Catalytic Reduction of N₂O with CO over Monolith Catalysts[J]. Chin.J.Chem.Eng., 2013, 21(8): 835-843.

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Transfer and Reaction Performances of Selective Catalytic Reduction of N₂O with CO over Monolith Catalysts

Transfer and Reaction Performances of Selective Catalytic Reduction of N₂O with CO over Monolith Catalysts

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