Реферат: The electron states of copper have been studied by ESR and UV-Vis as a function of the method used for preparation of Cu-ZSM-5 (ion-exchange, wet impregnation, and deposition), synthesis conditions (pH of copper solution, copper precursor, temperature, etc.) and copper loading. For calcined Cu-ZSM-5 samples treated under vacuum at 400 °C, axial ESR spectra of O− ion radicals (g⊥=2.05, g∥=2.02), which are presumably assigned to linear O−Cu+O−Cu+O−-chains in zeolite channels, are observed. The same samples treated under vacuum at 150–400 °C, exhibit UV-Vis absorption bands at the unexpected region of 18,000–23,000 cm−1. They are assigned to the ligand–metal charge transfer bands in O2−Cu2+O2−Cu2+O2−-like chains in the zeolite channels. Along with these states, isolated octahedral Cu2+ ions with different extents of tetragonal distortion (absorption band (a.b.) 12,500–14,000 cm−1) and clustered copper oxide species (charge transfer band (CTB) 27,000–32,000 cm−1) are also observed.

Библиографическая ссылка: Ismagilov Z.R. , Yashnik S.A. , Anufrienko V.F. , Larina T.V. , Vasenin N.T. , Bulgakov N.N. , Voselʹ S.V. , Tsykoza L.T.
Linear Nanoscale Clusters of CuO in Cu-ZSM-5 Catalysts
Applied Surface Science. 2004. V.226. N1-3. P.88-93. DOI: 10.1016/j.apsusc.2003.11.035 WOS Scopus РИНЦ CAPlusCA OpenAlex Sciact

Даты:

Опубликована online:	19 дек. 2003 г.
Опубликована в печати:	15 мар. 2004 г.

Идентификаторы БД:

Web of science:	WOS:000220675400018
Scopus:	2-s2.0-1642328179
РИНЦ:	13459130
Chemical Abstracts:	2004:239443
Chemical Abstracts (print):	140:308301
OpenAlex:	W2045844201
Sciact:	7029

Цитирование в БД:

БД	Цитирований
Scopus	64
OpenAlex	62

Альметрики: