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Adsorption of NO on an over-exchanged Cu-ZSM-5 sample (SiO 2 /Al 2 O 3 =23) leads to formation of the well-known nitrosyl species of Cu 2+ and Cu + . In addition, two kinds of Cu 3+ –NO mononitrosyls are detected by IR bands at 1960 and 1947cm −1 . The Cu 3+ species are produced as a result of disproportionation of Cu 2+ ions...
The geminal complexes formed after adsorption of small molecules on cationic sites may be divided into two main groups: site- and complex-specified. Complex-specified formation always occurs during the interaction of definite cations with certain molecules. Typical examples are the Co 2+ (NO) 2 species. A peculiarity, in this case, is that the geminal complexes are more stable...
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