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Stability of silver cluster in zeolite A and Y catalysts

Takashi Yamamoto1, Sakae Takenaka2, Tsunehiro Tanaka3 and Toshihide Baba4

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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.


PACS

82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces

78.70.Dm X-ray absorption spectra

78.40.Ha Other nonmetallic inorganics

Subjects

Condensed matter: electrical, magnetic and optical

Surfaces, interfaces and thin films

Chemical physics and physical chemistry

Dates

Issue 1 (2009)



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