SCI和EI收录∣中国化工学会会刊

Chin.J.Chem.Eng. ›› 2013, Vol. 21 ›› Issue (8): 835-843.DOI: 10.1016/S1004-9541(13)60559-5

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

DAI Chengna, LEI Zhigang, WANG Yuli, ZHANG Runduo, CHEN Biaohua   

  1. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
  • Received:2012-01-08 Revised:2012-08-04 Online:2013-08-24 Published:2013-08-28
  • Supported by:

    Supported by the National Natural Science Foundation of China (21121064, 21076008), and the Projects in the National Science & Technology Pillar Program During the 12th Five-Year Plan Period (2011BAC06B04).

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

代成娜, 雷志刚, 王玉丽, 张润铎, 陈标华   

  1. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
  • 通讯作者: LEI Zhigang
  • 基金资助:

    Supported by the National Natural Science Foundation of China (21121064, 21076008), and the Projects in the National Science & Technology Pillar Program During the 12th Five-Year Plan Period (2011BAC06B04).

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

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