FTIR in situ mechanistic study of the NH₃NO/NO₂ 鈥淔ast SCR鈥?reaction over a commercial Fe-ZSM-5 catalyst

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• 作者：Maria Pia Ruggeri^a ; Antonio Grossale^a ; Isabella Nova^a ; Enrico Tronconi^a ; ^{enrico.tronconi@polimi.it} ; Hana Jirglova^b ; Zdenek Sobalik^b
• 关键词：Urea/NH3 SCR ; Fast SCR ; NO2 adsorption ; Fe-zeolite catalysts ; Diesel exhaust aftertreatment ; FTIR
• 刊名：Catalysis Today
• 出版年：2012
• 期刊代码：13_09205861
• 类别：ce
• 出版时间：30 April, 2012
• 卷：184
• 期：1
• 页码：107-114
• 文件大小：847 K

摘要

New insight in the mechanism of the so-called 鈥淔ast SCR鈥?reaction over a commercial Fe zeolite catalyst was gained by an in situ FTIR investigation of the evolution of the surface intermediates during step response runs addressing the adsorption of NO₂, as well as the reactivity of surface NO_x with NH₃ and with NO. The collected data, combined with the analysis of companion transient flow reactor experiments demonstrating the corresponding dynamics of gaseous reactants and products, confirm the key role of ferric nitrites/nitrates in the reaction pathway, and emphasize the cooperative interaction between the zeolite acidic sites, where ammonia is stored, and the Fe red-ox sites of the catalyst, which are involved in the critical reduction of surface nitrates by NO.