Cargando…

Highly Porous Para-Aramid Aerogel as a Heterogeneous Catalyst for Selective Hydrogenation of Unsaturated Organic Compounds

A new para-aramid aerogel based on a polymer made by the reaction of terephthaloyl dichloride with 2-(4-aminophenyl)-1H-benzimidazol-5-amine (PABI) is introduced. The aerogel readily bound Pd (+2) ions and was used as a hydrogenation catalyst in some industrially actual reactions. The new material,...

Descripción completa

Detalles Bibliográficos
Autores principales: Lermontov, Sergey A., Vlasenko, Nikita E., Sipyagina, Nataliya A., Malkova, Alena N., Gozhikova, Inna O., Baranchikov, Alexander E., Knerelman, Evgeniya I.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10421250/
https://www.ncbi.nlm.nih.gov/pubmed/37571100
http://dx.doi.org/10.3390/polym15153206
_version_ 1785088927048138752
author Lermontov, Sergey A.
Vlasenko, Nikita E.
Sipyagina, Nataliya A.
Malkova, Alena N.
Gozhikova, Inna O.
Baranchikov, Alexander E.
Knerelman, Evgeniya I.
author_facet Lermontov, Sergey A.
Vlasenko, Nikita E.
Sipyagina, Nataliya A.
Malkova, Alena N.
Gozhikova, Inna O.
Baranchikov, Alexander E.
Knerelman, Evgeniya I.
author_sort Lermontov, Sergey A.
collection PubMed
description A new para-aramid aerogel based on a polymer made by the reaction of terephthaloyl dichloride with 2-(4-aminophenyl)-1H-benzimidazol-5-amine (PABI) is introduced. The aerogel readily bound Pd (+2) ions and was used as a hydrogenation catalyst in some industrially actual reactions. The new material, which did not contain p-phenylenediamine moieties, was prepared in two form factors: bulk samples and spherical pellets of 700–900 μm in diameter. Aerogels were synthesized from 1% or 5% solutions of PABI in N,N-dimethylacetamide via gelation with acetone or isopropanol and had a density of 0.057 or 0.375 g/cm(3) depending on the concentration of the starting PABI solution. The specific surface area of the obtained samples was 470 or 320 m(2)/g. Spherical pellets containing Pd were prepared from a solution of PdCl(2) in PABI and were used as heterogeneous catalysts for the gas-phase hydrogenation of unsaturated organic compounds presenting the main types of industrially important substrates: olefins, acetylenes, aromatics, carbonyls, and nitriles. Catalytic hydrogenation of gaseous hexene-1, hexyne-3, cyclohexene, and acrylonitrile C=C bond proceeded with a 99% conversion at ambient pressure, but the catalyst failed to reduce acetone at 150 °C and benzene and ethyl acetate even at 200 °C. The only product of acrylonitrile hydrogenation was propionitrile. The prepared catalysts showed high selectivity, which is important for the chemistry of complex organic compounds.
format Online
Article
Text
id pubmed-10421250
institution National Center for Biotechnology Information
language English
publishDate 2023
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-104212502023-08-12 Highly Porous Para-Aramid Aerogel as a Heterogeneous Catalyst for Selective Hydrogenation of Unsaturated Organic Compounds Lermontov, Sergey A. Vlasenko, Nikita E. Sipyagina, Nataliya A. Malkova, Alena N. Gozhikova, Inna O. Baranchikov, Alexander E. Knerelman, Evgeniya I. Polymers (Basel) Article A new para-aramid aerogel based on a polymer made by the reaction of terephthaloyl dichloride with 2-(4-aminophenyl)-1H-benzimidazol-5-amine (PABI) is introduced. The aerogel readily bound Pd (+2) ions and was used as a hydrogenation catalyst in some industrially actual reactions. The new material, which did not contain p-phenylenediamine moieties, was prepared in two form factors: bulk samples and spherical pellets of 700–900 μm in diameter. Aerogels were synthesized from 1% or 5% solutions of PABI in N,N-dimethylacetamide via gelation with acetone or isopropanol and had a density of 0.057 or 0.375 g/cm(3) depending on the concentration of the starting PABI solution. The specific surface area of the obtained samples was 470 or 320 m(2)/g. Spherical pellets containing Pd were prepared from a solution of PdCl(2) in PABI and were used as heterogeneous catalysts for the gas-phase hydrogenation of unsaturated organic compounds presenting the main types of industrially important substrates: olefins, acetylenes, aromatics, carbonyls, and nitriles. Catalytic hydrogenation of gaseous hexene-1, hexyne-3, cyclohexene, and acrylonitrile C=C bond proceeded with a 99% conversion at ambient pressure, but the catalyst failed to reduce acetone at 150 °C and benzene and ethyl acetate even at 200 °C. The only product of acrylonitrile hydrogenation was propionitrile. The prepared catalysts showed high selectivity, which is important for the chemistry of complex organic compounds. MDPI 2023-07-28 /pmc/articles/PMC10421250/ /pubmed/37571100 http://dx.doi.org/10.3390/polym15153206 Text en © 2023 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
Lermontov, Sergey A.
Vlasenko, Nikita E.
Sipyagina, Nataliya A.
Malkova, Alena N.
Gozhikova, Inna O.
Baranchikov, Alexander E.
Knerelman, Evgeniya I.
Highly Porous Para-Aramid Aerogel as a Heterogeneous Catalyst for Selective Hydrogenation of Unsaturated Organic Compounds
title Highly Porous Para-Aramid Aerogel as a Heterogeneous Catalyst for Selective Hydrogenation of Unsaturated Organic Compounds
title_full Highly Porous Para-Aramid Aerogel as a Heterogeneous Catalyst for Selective Hydrogenation of Unsaturated Organic Compounds
title_fullStr Highly Porous Para-Aramid Aerogel as a Heterogeneous Catalyst for Selective Hydrogenation of Unsaturated Organic Compounds
title_full_unstemmed Highly Porous Para-Aramid Aerogel as a Heterogeneous Catalyst for Selective Hydrogenation of Unsaturated Organic Compounds
title_short Highly Porous Para-Aramid Aerogel as a Heterogeneous Catalyst for Selective Hydrogenation of Unsaturated Organic Compounds
title_sort highly porous para-aramid aerogel as a heterogeneous catalyst for selective hydrogenation of unsaturated organic compounds
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10421250/
https://www.ncbi.nlm.nih.gov/pubmed/37571100
http://dx.doi.org/10.3390/polym15153206
work_keys_str_mv AT lermontovsergeya highlyporousparaaramidaerogelasaheterogeneouscatalystforselectivehydrogenationofunsaturatedorganiccompounds
AT vlasenkonikitae highlyporousparaaramidaerogelasaheterogeneouscatalystforselectivehydrogenationofunsaturatedorganiccompounds
AT sipyaginanataliyaa highlyporousparaaramidaerogelasaheterogeneouscatalystforselectivehydrogenationofunsaturatedorganiccompounds
AT malkovaalenan highlyporousparaaramidaerogelasaheterogeneouscatalystforselectivehydrogenationofunsaturatedorganiccompounds
AT gozhikovainnao highlyporousparaaramidaerogelasaheterogeneouscatalystforselectivehydrogenationofunsaturatedorganiccompounds
AT baranchikovalexandere highlyporousparaaramidaerogelasaheterogeneouscatalystforselectivehydrogenationofunsaturatedorganiccompounds
AT knerelmanevgeniyai highlyporousparaaramidaerogelasaheterogeneouscatalystforselectivehydrogenationofunsaturatedorganiccompounds