XPS study of the interaction of simple gases with zeolites containing transition elements

It has been found by X-ray photoelectron spectroscopy that, upon interaction of Ni-containing zeolites with CO or with CO+O₂, Ni²⁺ is reduced to Ni⁺ and Ni^o. The ability of Ni to reduction decreases in the following series of polycationic forms: Cr>Co>Ni>Cu. The treatment of CuNiNaY and CoNiNaY zeolites with CO leads to the formation of Cu⁺, Cu^o and Co^o, respectively.

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, Ni- CO CO+O₂ 250÷550°C Ni²⁺ Ni⁺ Ni^o. Ni : Cr>Co>Ni>Cu. CuNiNaY CoNiNaY Cu⁺, Cu^o Co^o, .