Stability of silver cluster in zeolite A and Y catalysts

doi:10.1088/1742-6596/190/1/012171

Stability of silver cluster in zeolite A and Y catalysts

Takashi Yamamoto et al 2009 J. Phys.: Conf. Ser. 190 012171 (4pp) doi: 10.1088/1742-6596/190/1/012171

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Takashi Yamamoto¹, Sakae Takenaka², Tsunehiro Tanaka³ and Toshihide Baba⁴
¹ Department of Chemistry, Faculty of Integrated Arts and Sciences, The University of Tokushima, Tokushima 770-8502, Japan
² Department of Chemical Engineering, Kyushu University, Fukuoka 819-0395, Japan
³ Department of Molecular Engineering, Kyoto University, Kyoto 615-8510, Japan
⁴ Department of Environmental Chemistry and Engineering, Tokyo Institute of Technology, Kanagawa 226-8502, Japan
E-mail: t-yamamo@ias.tokushima-u.ac.jp

Abstract. Chemical state analysis of silver species in Ag⁺ exchanged zeolite A and Y catalysts were carried out by means of XAFS and UV-Vis spectroscopies. Order of thermal stability of silver cluster was Ag(50%)-Y > Ag(60%)-A > Ag(100%)-A, which was consistent with the previous ¹H NMR study for stability of chemisorbed hydrogen species. The three shell model (Ag-O, Ag-Ag, and Ag-Al/Si) of silver cluster in zeolites was proposed.

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Stability of silver cluster in zeolite A and Y catalysts

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