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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(...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society of Chemistry
2018
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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. |
format | Online Article Text |
id | pubmed-9080048 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | The Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
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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