Linear Nanoscale Clusters of CuO in Cu-ZSM-5 Catalysts Full article
Conference |
E-MRS 2003 Spring Meeting 10-13 Jun 2003 , Strasbourg |
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Journal |
Applied Surface Science
ISSN: 0169-4332 |
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Output data | Year: 2004, Volume: 226, Number: 1-3, Pages: 88-93 Pages count : 6 DOI: 10.1016/j.apsusc.2003.11.035 | ||
Tags | Copper electron state, Copper-exchanged zeolite, Cu-ZSM-5, NO SCR by hydrocarbon | ||
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Abstract:
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.
Cite:
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
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
Dates:
Published online: | Dec 19, 2003 |
Published print: | Mar 15, 2004 |
Identifiers:
Web of science | WOS:000220675400018 |
Scopus | 2-s2.0-1642328179 |
Elibrary | 13459130 |
Chemical Abstracts | 2004:239443 |
Chemical Abstracts (print) | 140:308301 |
OpenAlex | W2045844201 |