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Tris(2-Aminoethyl)Amine/Metal Oxides Hybrid Materials—Preparation, Characterization and Catalytic Application

Three different metal oxides (basic MgO, basic-acidic Al(2)O(3) and acidic-basic Nb(2)O(5)) characterized by comparable surface areas (MgO—130 m(2)/g; Al(2)O(3)—172 m(2)/g and Nb(2)O(5)—123 m(2)/g) and pore systems (domination of mesopores with narrow pore size distribution) were modified with tris(...

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Autores principales: Stawicka, Katarzyna, Ziolek, Maria
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7587344/
https://www.ncbi.nlm.nih.gov/pubmed/33066391
http://dx.doi.org/10.3390/molecules25204689
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author Stawicka, Katarzyna
Ziolek, Maria
author_facet Stawicka, Katarzyna
Ziolek, Maria
author_sort Stawicka, Katarzyna
collection PubMed
description Three different metal oxides (basic MgO, basic-acidic Al(2)O(3) and acidic-basic Nb(2)O(5)) characterized by comparable surface areas (MgO—130 m(2)/g; Al(2)O(3)—172 m(2)/g and Nb(2)O(5)—123 m(2)/g) and pore systems (domination of mesopores with narrow pore size distribution) were modified with tris(2-aminoethyl)amine (TAEA) via two methods: (i) direct anchoring of amine on metal oxide and (ii) anchoring of amine on metal oxide functionalized with (3-chloropropyl)trimethoxysilane. The obtained hybrid materials were characterized in terms of effectiveness of modifier anchoring (elemental analysis), their structural/textural properties (nitrogen adsorption/desorption, XRD), acidity/basicity of support (2-propanol dehydration and dehydrogenation, dehydration and cyclization of 2,5-hexanedione), states of modifier deposited on supports (XPS, FTIR, UV–VIS) and the strength of interaction between the modifier and the support (TG/DTG). It was evidenced that acidic-basic properties of metal oxides as well as the procedure of modification with TAEA determined the ways of amine anchoring and the strength of its interaction with the support. The obtained hybrid materials were tested in Knoevenagel condensation between furfural and malononitrile. The catalysts based on MgO showed superior activity in this reaction. It was correlated with the way of TAEA anchoring on basic MgO and the strength of modifier anchoring on the support. To the best of our knowledge tris(2-aminoethyl)amine has not been used as a modifier of solid supports for enhancement of the catalyst activity in Knoevenagel condensation.
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spelling pubmed-75873442020-10-29 Tris(2-Aminoethyl)Amine/Metal Oxides Hybrid Materials—Preparation, Characterization and Catalytic Application Stawicka, Katarzyna Ziolek, Maria Molecules Article Three different metal oxides (basic MgO, basic-acidic Al(2)O(3) and acidic-basic Nb(2)O(5)) characterized by comparable surface areas (MgO—130 m(2)/g; Al(2)O(3)—172 m(2)/g and Nb(2)O(5)—123 m(2)/g) and pore systems (domination of mesopores with narrow pore size distribution) were modified with tris(2-aminoethyl)amine (TAEA) via two methods: (i) direct anchoring of amine on metal oxide and (ii) anchoring of amine on metal oxide functionalized with (3-chloropropyl)trimethoxysilane. The obtained hybrid materials were characterized in terms of effectiveness of modifier anchoring (elemental analysis), their structural/textural properties (nitrogen adsorption/desorption, XRD), acidity/basicity of support (2-propanol dehydration and dehydrogenation, dehydration and cyclization of 2,5-hexanedione), states of modifier deposited on supports (XPS, FTIR, UV–VIS) and the strength of interaction between the modifier and the support (TG/DTG). It was evidenced that acidic-basic properties of metal oxides as well as the procedure of modification with TAEA determined the ways of amine anchoring and the strength of its interaction with the support. The obtained hybrid materials were tested in Knoevenagel condensation between furfural and malononitrile. The catalysts based on MgO showed superior activity in this reaction. It was correlated with the way of TAEA anchoring on basic MgO and the strength of modifier anchoring on the support. To the best of our knowledge tris(2-aminoethyl)amine has not been used as a modifier of solid supports for enhancement of the catalyst activity in Knoevenagel condensation. MDPI 2020-10-14 /pmc/articles/PMC7587344/ /pubmed/33066391 http://dx.doi.org/10.3390/molecules25204689 Text en © 2020 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Stawicka, Katarzyna
Ziolek, Maria
Tris(2-Aminoethyl)Amine/Metal Oxides Hybrid Materials—Preparation, Characterization and Catalytic Application
title Tris(2-Aminoethyl)Amine/Metal Oxides Hybrid Materials—Preparation, Characterization and Catalytic Application
title_full Tris(2-Aminoethyl)Amine/Metal Oxides Hybrid Materials—Preparation, Characterization and Catalytic Application
title_fullStr Tris(2-Aminoethyl)Amine/Metal Oxides Hybrid Materials—Preparation, Characterization and Catalytic Application
title_full_unstemmed Tris(2-Aminoethyl)Amine/Metal Oxides Hybrid Materials—Preparation, Characterization and Catalytic Application
title_short Tris(2-Aminoethyl)Amine/Metal Oxides Hybrid Materials—Preparation, Characterization and Catalytic Application
title_sort tris(2-aminoethyl)amine/metal oxides hybrid materials—preparation, characterization and catalytic application
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7587344/
https://www.ncbi.nlm.nih.gov/pubmed/33066391
http://dx.doi.org/10.3390/molecules25204689
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