Different states of copper have been identified on the surface of γ-Al2O3, mordenite, erionite, clinoptilolite, pumice, and foam copper catalysts by UV-Vis and IR spectroscopy. Zeolite copper shows the highest dispersion, while on the surface of pumice and bulk metal, the portion of oxidized states of copper is small. The modifiers produce a direct effect on the electronic properties of dispersed copper. Ce and Zr oxides cause an increase on the effective charge of copper ions, stabilizing the oxidized state. In contrast, La and Cs oxides lower the effective charge of Cu + and Cun δ+, and favor their fast reduction.
|Number of pages||5|
|Journal||Revista Mexicana de Fisica|
|Issue number||2 SUPPL.|
|Publication status||Published - Jun 2005|
- Oxidation catalysts
ASJC Scopus subject areas
- Physics and Astronomy(all)