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The Properties of Cu Ions in Zeolites CuY Studied by IR Spectroscopy

The properties of both Cu(2+) and Cu(+) ions in zeolite CuY were followed with NO and CO as probe molecules. Cu(2+) was found to be located in S(II), S(II*), and S(III) sites, whereas Cu(+) was found in S(II) and S(II*) sites. The fine analysis of the spectra of Cu(2+)-NO and Cu(+)-CO adducts sugges...

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Autores principales: Podobiński, Jerzy, Gackowski, Mariusz, Mordarski, Grzegorz, Samson, Katarzyna, Śliwa, Michał, Rutkowska-Zbik, Dorota, Datka, Jerzy
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8347275/
https://www.ncbi.nlm.nih.gov/pubmed/34361843
http://dx.doi.org/10.3390/molecules26154686
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author Podobiński, Jerzy
Gackowski, Mariusz
Mordarski, Grzegorz
Samson, Katarzyna
Śliwa, Michał
Rutkowska-Zbik, Dorota
Datka, Jerzy
author_facet Podobiński, Jerzy
Gackowski, Mariusz
Mordarski, Grzegorz
Samson, Katarzyna
Śliwa, Michał
Rutkowska-Zbik, Dorota
Datka, Jerzy
author_sort Podobiński, Jerzy
collection PubMed
description The properties of both Cu(2+) and Cu(+) ions in zeolite CuY were followed with NO and CO as probe molecules. Cu(2+) was found to be located in S(II), S(II*), and S(III) sites, whereas Cu(+) was found in S(II) and S(II*) sites. The fine analysis of the spectra of Cu(2+)-NO and Cu(+)-CO adducts suggests that both in S(II) and in S(II*) sites two kinds of Cu cations exist. They differ in the positive charge, which may be related to the varying numbers of AlO(4)(−) in close proximity. The experiments of NO and CO adsorption and desorption evidenced that both Cu(2+) and Cu(+) sites of highest positive charge bind probe molecules most strongly but activate them to a lesser extent than the Cu sites of lowest positive charge. The experiments of reduction with hydrogen evidenced that the Cu ions of higher positive charge are first reduced by hydrogen. On the other hand, Cu sites of the lowest positive charge are first oxidized by oxygen. The experiments with CuNaY zeolites of various Cu contents suggest that the first introduced Cu (at low Cu contents) created Cu(+), which was the most neutralized by framework oxygens. Such Cu cations are the most stabilized by framework oxygens.
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spelling pubmed-83472752021-08-08 The Properties of Cu Ions in Zeolites CuY Studied by IR Spectroscopy Podobiński, Jerzy Gackowski, Mariusz Mordarski, Grzegorz Samson, Katarzyna Śliwa, Michał Rutkowska-Zbik, Dorota Datka, Jerzy Molecules Article The properties of both Cu(2+) and Cu(+) ions in zeolite CuY were followed with NO and CO as probe molecules. Cu(2+) was found to be located in S(II), S(II*), and S(III) sites, whereas Cu(+) was found in S(II) and S(II*) sites. The fine analysis of the spectra of Cu(2+)-NO and Cu(+)-CO adducts suggests that both in S(II) and in S(II*) sites two kinds of Cu cations exist. They differ in the positive charge, which may be related to the varying numbers of AlO(4)(−) in close proximity. The experiments of NO and CO adsorption and desorption evidenced that both Cu(2+) and Cu(+) sites of highest positive charge bind probe molecules most strongly but activate them to a lesser extent than the Cu sites of lowest positive charge. The experiments of reduction with hydrogen evidenced that the Cu ions of higher positive charge are first reduced by hydrogen. On the other hand, Cu sites of the lowest positive charge are first oxidized by oxygen. The experiments with CuNaY zeolites of various Cu contents suggest that the first introduced Cu (at low Cu contents) created Cu(+), which was the most neutralized by framework oxygens. Such Cu cations are the most stabilized by framework oxygens. MDPI 2021-08-03 /pmc/articles/PMC8347275/ /pubmed/34361843 http://dx.doi.org/10.3390/molecules26154686 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Podobiński, Jerzy
Gackowski, Mariusz
Mordarski, Grzegorz
Samson, Katarzyna
Śliwa, Michał
Rutkowska-Zbik, Dorota
Datka, Jerzy
The Properties of Cu Ions in Zeolites CuY Studied by IR Spectroscopy
title The Properties of Cu Ions in Zeolites CuY Studied by IR Spectroscopy
title_full The Properties of Cu Ions in Zeolites CuY Studied by IR Spectroscopy
title_fullStr The Properties of Cu Ions in Zeolites CuY Studied by IR Spectroscopy
title_full_unstemmed The Properties of Cu Ions in Zeolites CuY Studied by IR Spectroscopy
title_short The Properties of Cu Ions in Zeolites CuY Studied by IR Spectroscopy
title_sort properties of cu ions in zeolites cuy studied by ir spectroscopy
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8347275/
https://www.ncbi.nlm.nih.gov/pubmed/34361843
http://dx.doi.org/10.3390/molecules26154686
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