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- W2030418097 abstract "Dynamic structural changes of Ag in Ag-MFI upon H2 reduction and subsequent reoxidation treatments were investigated by various characterization methods. Results of in situ time-resolved spectroscopies, UV−vis and quick XAFS, at 573 K show that Ag+ ions at a cation-exchange site of preoxidized Ag-MFI are reduced by H2 to a Ag4δ+ cluster. Protons on the zeolite (Brønsted acid sites) are also produced by the H2 reduction of Ag-MFI as evidenced by IR measurements after D2 adsorption. At higher reduction temperatures, the aggregation of Ag4δ+ clusters results in the formation of larger Agn (n > 8) clusters, and Ag metal particles appear on the external surface of the zeolite. Upon reoxidation at 573 K, the silver clusters are redispersed to Ag+ ions. The rate constant of cluster redispersion at 573 K depends on the oxidants used and increases in the order of NO(0.1%) + O2(10%) > O2(10%) > NO(0.1%). The activation energy for cluster formation in H2 was lower than that for cluster redispersion during reoxidation with O2. The effect of Ag exchange level on the rate constants and apparent activation energies for Ag cluster formation in H2 and Ag cluster redispersion in O2 are also examined." @default.
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- W2030418097 date "2007-01-10" @default.
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- W2030418097 title "Formation and Redispersion of Silver Clusters in Ag-MFI Zeolite as Investigated by Time-Resolved QXAFS and UV−Vis" @default.
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- W2030418097 doi "https://doi.org/10.1021/jp066995a" @default.
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