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Open AccessArticle

Reduction and Oxidation of Cu Species in Cu-Faujasites Studied by IR Spectroscopy

Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239 Krakow, Poland
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Academic Editor: Mark Symes
Molecules 2020, 25(20), 4765; https://doi.org/10.3390/molecules25204765
Received: 21 July 2020 / Revised: 8 October 2020 / Accepted: 13 October 2020 / Published: 16 October 2020
(This article belongs to the Section Inorganic Chemistry)
The process of reduction (by hydrogen and ethanol) and oxidation (by oxygen and NO) of Cu sites in dealuminated faujasite-type zeolites (of Si/Al = 31) was studied by infrared (IR) spectroscopy with CO (for Cu+) and NO (for Cu2+) as probe molecules. Two zeolites were studied: one of them contained mostly Cu+exch., whereas another one contained mostly Cu2+ and Cu+ox. The susceptibility of various forms of Cu for reduction were investigated. IR experiments of CO sorption evidenced that Cu+ox. was more prone for the reduction than Cu+exch. According to NO sorption studies, Cu2+exch. was reduced in the first order before Cu2+ox. Ethanol reduced mostly Cu2+ and, also, some amounts of Cu+. The treatment with oxygen caused the oxidation of Cu+ (both Cu+exch. and Cu+ox.) to Cu2+. The adsorption of NO at 190K produced Cu+(NO)2 dinitrosyls, but heating to room temperature transformed dinitrosyls to mononitrosyls and increased the Cu2+ content. View Full-Text
Keywords: CO/NO-IR spectroscopy; Cu sites; reduction; hydrogen; ethanol CO/NO-IR spectroscopy; Cu sites; reduction; hydrogen; ethanol
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MDPI and ACS Style

Kuterasiński, Ł.; Podobiński, J.; Madej, E.; Smoliło-Utrata, M.; Rutkowska-Zbik, D.; Datka, J. Reduction and Oxidation of Cu Species in Cu-Faujasites Studied by IR Spectroscopy. Molecules 2020, 25, 4765.

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