Simultaneous NO Reduction / CO Oxidation By FeOOH Catalyst

• Main Authors: Chen , Pi-Yu, 陳碧玉
• Other Authors: 陳孝行
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/qsadw8

碩士 === 國立臺北科技大學 === 環境規劃與管理研究所 === 95 === FeOOH was used in this study to evaluate the efficiencies of simultaneously reduction of NO and oxidization of CO by a packed bed reactor. There were four reaction parameters in this study: reaction temperature, NO influent, CO influent and FeOOH dosage. Possible reaction steps were investigated by X-Ray Diffraction (XRD) spectrum from raw and reacted FeOOH. It is observed that with higher reaction temperature, the removal efficiency of both NO and CO were higher. When reaction temperature increased from 373 K to 673 K, NO removal efficiency was linearly correlated with reaction temperature. NO removal efficiency was over 98% for NO influent concentrations of 240~720 ppmv with CO concentration of 1910 ppmv with FeOOH of 3g. When NO influent over 720 ppmv, NO removal efficiency decreased due to the FeOOH is used up. NO removal efficiency was only 6 % when CO reacted efficiency was 31~36 % at lower FeOOH Dosage 2~3g, indicating there were no sufficient sites for reactions to provide NO reduction. The higher dosage of FeOOH (4~6g) results in higher removal efficiency of NO and CO. Regression analysis shows the rank for these parameters is CO influent >CO reacted efficiency> NO influent > FeOOH Dosage > temperature XRD (X-Ray Diffraction) was conducted to analyze the crystal structure and oxidation state of the raw and reacted FeOOH. It is demonstrated that carbon monoxide reduced Fe3+ ion of FeOOH to Fe2+ and nitric oxide oxidized Fe2+ back to Fe3+ ion, indicating FeOOH is a catalyst in the reaction.