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Effective solvent-free oxidation of cyclohexene to allylic products with oxygen by mesoporous etched halloysite nanotube supported Co(2+)

One dimensional mesoporous etched halloysite nanotube supported Co(2+) is achieved by selective etching of Al(2)O(3) from halloysite nanotube (HA) and immersing the etched HA (eHA) into the Co(NO(3))(2)·6H(2)O solution consecutively. By facilely tuning the etching time and the weight ratio of Co(NO(...

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Autores principales: Li, Cuiping, Zhao, Yue, Zhu, Tianwen, Li, Yan'ge, Ruan, Jiajia, Li, Guanghui
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9080048/
https://www.ncbi.nlm.nih.gov/pubmed/35541354
http://dx.doi.org/10.1039/c7ra11245a
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author Li, Cuiping
Zhao, Yue
Zhu, Tianwen
Li, Yan'ge
Ruan, Jiajia
Li, Guanghui
author_facet Li, Cuiping
Zhao, Yue
Zhu, Tianwen
Li, Yan'ge
Ruan, Jiajia
Li, Guanghui
author_sort Li, Cuiping
collection PubMed
description One dimensional mesoporous etched halloysite nanotube supported Co(2+) is achieved by selective etching of Al(2)O(3) from halloysite nanotube (HA) and immersing the etched HA (eHA) into the Co(NO(3))(2)·6H(2)O solution consecutively. By facilely tuning the etching time and the weight ratio of Co(NO(3))(2)·6H(2)O to eHA, the morphology, specific surface area and the supported Co(2+) content of the mesoporous material can be tuned. The method for mesoporous material is scaled up and can be extended to other clay minerals. The mesoporous eHA supported Co(2+) is used as catalyst for the selective catalytic oxidation of cyclohexene in solvent-free reaction system with O(2) as oxidant. The results shows the catalytic activity is dependent on etching time, weight ratio of Co(NO(3))(2)·6H(2)O to eHA, calcination treatment and reaction time/temperature. Among them, mesoporous eHA supported Co(2+) prepared with 18 h etching time and 2 : 1 Co(NO(3))(2)·6H(2)O/eHA weight ratio without calcination (HA/HCl-18 h/Co(2+)-2 : 1) demonstrates the highest catalytic activity under 75 °C reaction temperature and 18 h reaction time (58.30% conversion and 94.03% selectivity to allylic products). Furthermore, HA/HCl-18 h/Co(2+)-2 : 1 has exhibit superior cycling stability with 37.69% conversion and 92.73% selectivity to allylic products after three cycles.
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spelling pubmed-90800482022-05-09 Effective solvent-free oxidation of cyclohexene to allylic products with oxygen by mesoporous etched halloysite nanotube supported Co(2+) Li, Cuiping Zhao, Yue Zhu, Tianwen Li, Yan'ge Ruan, Jiajia Li, Guanghui RSC Adv Chemistry One dimensional mesoporous etched halloysite nanotube supported Co(2+) is achieved by selective etching of Al(2)O(3) from halloysite nanotube (HA) and immersing the etched HA (eHA) into the Co(NO(3))(2)·6H(2)O solution consecutively. By facilely tuning the etching time and the weight ratio of Co(NO(3))(2)·6H(2)O to eHA, the morphology, specific surface area and the supported Co(2+) content of the mesoporous material can be tuned. The method for mesoporous material is scaled up and can be extended to other clay minerals. The mesoporous eHA supported Co(2+) is used as catalyst for the selective catalytic oxidation of cyclohexene in solvent-free reaction system with O(2) as oxidant. The results shows the catalytic activity is dependent on etching time, weight ratio of Co(NO(3))(2)·6H(2)O to eHA, calcination treatment and reaction time/temperature. Among them, mesoporous eHA supported Co(2+) prepared with 18 h etching time and 2 : 1 Co(NO(3))(2)·6H(2)O/eHA weight ratio without calcination (HA/HCl-18 h/Co(2+)-2 : 1) demonstrates the highest catalytic activity under 75 °C reaction temperature and 18 h reaction time (58.30% conversion and 94.03% selectivity to allylic products). Furthermore, HA/HCl-18 h/Co(2+)-2 : 1 has exhibit superior cycling stability with 37.69% conversion and 92.73% selectivity to allylic products after three cycles. The Royal Society of Chemistry 2018-04-19 /pmc/articles/PMC9080048/ /pubmed/35541354 http://dx.doi.org/10.1039/c7ra11245a Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Li, Cuiping
Zhao, Yue
Zhu, Tianwen
Li, Yan'ge
Ruan, Jiajia
Li, Guanghui
Effective solvent-free oxidation of cyclohexene to allylic products with oxygen by mesoporous etched halloysite nanotube supported Co(2+)
title Effective solvent-free oxidation of cyclohexene to allylic products with oxygen by mesoporous etched halloysite nanotube supported Co(2+)
title_full Effective solvent-free oxidation of cyclohexene to allylic products with oxygen by mesoporous etched halloysite nanotube supported Co(2+)
title_fullStr Effective solvent-free oxidation of cyclohexene to allylic products with oxygen by mesoporous etched halloysite nanotube supported Co(2+)
title_full_unstemmed Effective solvent-free oxidation of cyclohexene to allylic products with oxygen by mesoporous etched halloysite nanotube supported Co(2+)
title_short Effective solvent-free oxidation of cyclohexene to allylic products with oxygen by mesoporous etched halloysite nanotube supported Co(2+)
title_sort effective solvent-free oxidation of cyclohexene to allylic products with oxygen by mesoporous etched halloysite nanotube supported co(2+)
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9080048/
https://www.ncbi.nlm.nih.gov/pubmed/35541354
http://dx.doi.org/10.1039/c7ra11245a
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