ESR studies of silver clusters in the isostructural A and ZK-4 molecular sieves

• Autorzy: Michalik J. , Yu J.-S. , Sadło J.
• Języki publikacji: EN

Abstrakty

EN

Cationic silver clusters formed in l-irradiated Ag+-exchanged Linde 4A zeolite and isostructural synthetic ZK-4 zeolite with Si/ Al ratio of 1.2 and 2.4 have been studied by electron spin resonance (ESR) spectroscopy. Whereas dehydrated AgNa-A zeolite shows rem.arkable ability for stabilization of Ag(6)n+ clusters in AgNa-ZK-4 zeolites hexameric silver clusters are not formed at all. .In ZK-4 samples exposed to water or methanol tetrameric silver clusters Ag(3)(4)+ are efficiently produced. Although geometri-cal size constraints play a crucial role with respect to cluster nuclearity and stability, in this paper we show that other factors like total cation capacity and/ or the presence of molecular adsorbates can affect the silver agglomeration process to a great extent.

Słowa kluczowe

EN

silver; cluster; radiolysis; zeolite

PL

srebro; klaster; radioliza; zeolit

• Wydawca: Centrum Upowszechniania Nauki PAN
• Czasopismo: Bulletin of the Polish Academy of Sciences. Chemistry
• Rocznik: 2000
• Tom: Vol. 48, No. 4
• Strony: 293--301
• Opis fizyczny: Bibliogr. 14 poz.

Twórcy

autor

Michalik J.

autor

Yu J.-S.

autor

Sadło J.

• Institute of Nuclear Chemistry and Technology, Department of Radiation Chemistry and Technology, ul. Dorodna 16, 03-195 Warsaw, Poland (Instytut Chemii i Techniki Jądrowej, Zakład Chemii i Techniki Radiacyjnej, Warszawa)