EPR of O-2(-) radicals in the zeolites NH4NaY and NH(4)CaA
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES, cilt.53, sa.12, ss.951-954, 1998 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 53 Sayı: 12
- Basım Tarihi: 1998
- Dergi Adı: ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.951-954
- Süleyman Demirel Üniversitesi Adresli: Hayır
Özet
Activated and non-activated states of the zeolites NH4NaY and NH(4)CaA, and their NH; forms were prepared with an (NH4)(2)SO4 solution and were investigated by EPR after gamma-irradiation. The formed radicals were attributed to O-2(-) supposed to be trapped near a trigonally coordinated framework of Al-27(27)(I = 5/2). Anisotropic O-2(-) spectra were observed, consisting of hyperfine structure due to the Al framework, even at room temperature. This was attributed to the scarceness of NH4+ sites or trap sites because of the preparation of the NH4+ forms of the zeolites with an (NH4)(2)SO4 solution. The crystal field splittings were found and interpreted.