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De-NOx-ING Photocatalysis - Excited States of Copper Ions Anchored onto Zeolite and Their Role in Photocatalytic Decomposition of no at 275 K

Elsevier Science & Technology
DOI: 10.1016/s0167-2991(08)64249-4


Abstract Cu2+ ions anchored onto ZSM-5 zeolite prepared by an ion-exchange method were reduced to Cu+ by progressive evacuation at high temperatures. The Cu+/ZSM-5 catalyst decomposed NO molecules photocatalytically and stoichiometrically into N2 and O2 at 275 K. Dynamic photoluminescence, ESR, and IR studies of the excited states of Cu+ ions and the adsorbed species of NO on the catalyst have indicated that the Cu+ ions located as isolated Cu+ monomer species in ZSM-5 and NO molecules are adsorbed on them to form Cu+–NO adduct species. From these results, it has been clarified that a local charge separation, i. e., an electron transfer from the excited state of the Cu+ (3d94s1) to an anti-bonding orbital of NO plays a significant role to initiate the decomposition of NO.

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