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Unique Lewis and Bronsted acidic sites texture in the selective production of tetrahydropyran and oxepanefrom1,5-pentanediol and 1,6-hexanediol over sustainable red brick clay catalyst

Activated red brick (ARB) clay material proved superb catalyst for selective conversion of 1,5-pentanediol (1,5-PDO) to tetrahydropyran (THP) and 1,6-hexanediol (1,6-HDO) to oxepane (OP) via dehydration under vapor phase conditions in a continuous flow reactor. As per scanning electron microscopy (S...

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Autores principales: Madduluri, Venkata Rao, Katari, Naresh Kumar, Peddinti, Nagaiah, Prathap, Challa, Burri, David Raju, Kamaraju, Seetha Rama Rao, Jonnalagadda, Sreekantha B.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Elsevier 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6376155/
https://www.ncbi.nlm.nih.gov/pubmed/30809597
http://dx.doi.org/10.1016/j.heliyon.2019.e01212
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author Madduluri, Venkata Rao
Katari, Naresh Kumar
Peddinti, Nagaiah
Prathap, Challa
Burri, David Raju
Kamaraju, Seetha Rama Rao
Jonnalagadda, Sreekantha B.
author_facet Madduluri, Venkata Rao
Katari, Naresh Kumar
Peddinti, Nagaiah
Prathap, Challa
Burri, David Raju
Kamaraju, Seetha Rama Rao
Jonnalagadda, Sreekantha B.
author_sort Madduluri, Venkata Rao
collection PubMed
description Activated red brick (ARB) clay material proved superb catalyst for selective conversion of 1,5-pentanediol (1,5-PDO) to tetrahydropyran (THP) and 1,6-hexanediol (1,6-HDO) to oxepane (OP) via dehydration under vapor phase conditions in a continuous flow reactor. As per scanning electron microscopy (SEM), SEM-EDX and X-ray fluorescence (XRF) techniques, ARB clay catalyst majorly possessed silica (quartz), and iron oxide (hematite) species, and synergistic texture contributed to the catalytic efficiency for prolonged time-on-stream (TOS). The combination of active Lewis and Bronsted acidic sites with weak to mild acidic nature in the ARB clay obviously facilitates the dehydration reaction with high selectivity, tetrahydropyran (82%) and oxepane (89%). ARB clay displayed superior catalytic properties in the dehydration of alcohols compared with activities of commercial silica and α-Fe(2)O(3) as catalysts. Commercial silica and α-Fe(2)O(3) catalysts possessing the Lewis acidic sites only did not facilitate synchronous dehydration mechanism.
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spelling pubmed-63761552019-02-26 Unique Lewis and Bronsted acidic sites texture in the selective production of tetrahydropyran and oxepanefrom1,5-pentanediol and 1,6-hexanediol over sustainable red brick clay catalyst Madduluri, Venkata Rao Katari, Naresh Kumar Peddinti, Nagaiah Prathap, Challa Burri, David Raju Kamaraju, Seetha Rama Rao Jonnalagadda, Sreekantha B. Heliyon Article Activated red brick (ARB) clay material proved superb catalyst for selective conversion of 1,5-pentanediol (1,5-PDO) to tetrahydropyran (THP) and 1,6-hexanediol (1,6-HDO) to oxepane (OP) via dehydration under vapor phase conditions in a continuous flow reactor. As per scanning electron microscopy (SEM), SEM-EDX and X-ray fluorescence (XRF) techniques, ARB clay catalyst majorly possessed silica (quartz), and iron oxide (hematite) species, and synergistic texture contributed to the catalytic efficiency for prolonged time-on-stream (TOS). The combination of active Lewis and Bronsted acidic sites with weak to mild acidic nature in the ARB clay obviously facilitates the dehydration reaction with high selectivity, tetrahydropyran (82%) and oxepane (89%). ARB clay displayed superior catalytic properties in the dehydration of alcohols compared with activities of commercial silica and α-Fe(2)O(3) as catalysts. Commercial silica and α-Fe(2)O(3) catalysts possessing the Lewis acidic sites only did not facilitate synchronous dehydration mechanism. Elsevier 2019-02-13 /pmc/articles/PMC6376155/ /pubmed/30809597 http://dx.doi.org/10.1016/j.heliyon.2019.e01212 Text en © 2019 Published by Elsevier Ltd. http://creativecommons.org/licenses/by-nc-nd/4.0/ This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Article
Madduluri, Venkata Rao
Katari, Naresh Kumar
Peddinti, Nagaiah
Prathap, Challa
Burri, David Raju
Kamaraju, Seetha Rama Rao
Jonnalagadda, Sreekantha B.
Unique Lewis and Bronsted acidic sites texture in the selective production of tetrahydropyran and oxepanefrom1,5-pentanediol and 1,6-hexanediol over sustainable red brick clay catalyst
title Unique Lewis and Bronsted acidic sites texture in the selective production of tetrahydropyran and oxepanefrom1,5-pentanediol and 1,6-hexanediol over sustainable red brick clay catalyst
title_full Unique Lewis and Bronsted acidic sites texture in the selective production of tetrahydropyran and oxepanefrom1,5-pentanediol and 1,6-hexanediol over sustainable red brick clay catalyst
title_fullStr Unique Lewis and Bronsted acidic sites texture in the selective production of tetrahydropyran and oxepanefrom1,5-pentanediol and 1,6-hexanediol over sustainable red brick clay catalyst
title_full_unstemmed Unique Lewis and Bronsted acidic sites texture in the selective production of tetrahydropyran and oxepanefrom1,5-pentanediol and 1,6-hexanediol over sustainable red brick clay catalyst
title_short Unique Lewis and Bronsted acidic sites texture in the selective production of tetrahydropyran and oxepanefrom1,5-pentanediol and 1,6-hexanediol over sustainable red brick clay catalyst
title_sort unique lewis and bronsted acidic sites texture in the selective production of tetrahydropyran and oxepanefrom1,5-pentanediol and 1,6-hexanediol over sustainable red brick clay catalyst
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6376155/
https://www.ncbi.nlm.nih.gov/pubmed/30809597
http://dx.doi.org/10.1016/j.heliyon.2019.e01212
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