Selective catalytic reduction of NO by C₂H₂ over Ce-Al₂O₃ catalyst with rate-determining step of NO oxidation

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• 作者：Suhua Yan ; Xinping Wang ; ^{dllgwxp@dlut.edu.cn} ; Wenchen Wang ; Zequn Liu ; Jiahao Niu
• 关键词：NOx removal ; NO oxidation ; nitrate species ; Ce-Al2O3 ; acetylene
• 刊名：Journal of Natural Gas Chemistry
• 出版年：2012
• 期刊代码：8_10039953
• 类别：ce
• 出版时间：May, 2012
• 卷：21
• 期：3
• 页码：332-338
• 文件大小：374 K

摘要

Ce-Al₂O₃ catalysts prepared by co-precipitation are investigated both in NO oxidation by O₂ and in selective catalytic reduction of NO by C₂H₂ (C₂H₂-SCR). It is found that C₂H₂-SCR is initiated and controlled by NO oxidation to NO₂ over Al₂O₃. Ce loading on Al₂O₃ is almost inactive for NO oxidation below 350掳C, since NO₂ strongly adsorbs on cerium oxide, leading to the active sites being blocked, which was characterized by temperature-programmed desorption of NO and NO₂ and Fourier transform infrared spectroscopy after NO+O₂ coadsorption over the samples. However, in the case of C₂H₂-SCR, Ce loading on Al₂O₃ significantly improves the reaction by accelerating the NO oxidation step in the temperature range of 250-450掳C, since the nitrate species produced by NO₂ adsorption is an active intermediate required by C₂H₂-SCR.