Mechanism of NH3-SCR by Cu-AFX Zeolites

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  • Cu-AFXゼオライト上でのアンモニア脱硝メカニズム
  • Cu-AFX ゼオライト ジョウ デ ノ アンモニア ダッショウ メカニズム

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The selective reduction reaction of NOx (NH3-SCR) using NH3 as a reducing agent has been commercialized as a core technology of a urea-SCR system for diesel vehicles. A recent hot topic in heterogeneous catalysis is fundamental research for understanding the high NH3-SCR performance and high durability of Cu ion-exchanged small pore zeolites such as Cu-CHA. This paper describes our recent results on the mechanism of NH3-SCR over Cu ion-exchanged AFX zeolite (Cu-AFX) studied by using various in situ spectroscopic methods. It is concluded that Cu2+-NH3 complexes react with NO to produce N2, H+ and Cu+ (reduction half cycle), and subsequent reaction of Cu+ and H+ with O2 to yield water and Cu2+ (oxidation half cycle). The active species are Cu ions and the role of zeolites is simply to provide ion exchange sites for Cu2+/Cu+ ions and proton.

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  • ゼオライト

    ゼオライト 38 (1), 11-16, 2021-01-31

    Japan Association of Zeolite

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