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Selective oxidation of cyclohexane to cyclohexanone using chromium oxide supported mesoporous MCM-41 nanospheres: Probing the nature of catalytically active chromium sites

Selective oxidation of cyclohexane to cyclohexanone using chromium oxide supported mesoporous MCM-41 nanospheres: Probing the nature of catalytically active chromium sites
Selective oxidation of cyclohexane to cyclohexanone using chromium oxide supported mesoporous MCM-41 nanospheres: Probing the nature of catalytically active chromium sites
Highly dispersed chromium oxide supported mesoporous MCM‐41 nanosphere catalysts have been synthesized using a simple wet impregnation method. This work is devoted to a systematic study to reveal the active Cr sites in chromium oxide supported MCM‐41 nanosphere catalysts for the selective oxidation of cyclohexane to cyclohexanone. To probe the nature of the active species, we synthesized 0.5–10 wt % Cr loaded catalysts and characterized them by using XRD, UV/Vis spectroscopy, Raman spectroscopy, X‐ray photoelectron spectroscopy, extended X‐ray absorption fine structure analysis, X‐ray absorption near edge structure analysis, N2 sorption analysis, FTIR spectroscopy, 29Si NMR spectroscopy, SEM, and TEM. The liquid‐phase oxidation of cyclohexane to cyclohexanone (99 % selectivity) was performed under mild reaction conditions, and the results reveal clearly that the 5 wt % Cr loaded catalyst was optimum for the reaction. The initial composition of isolated Cr3+ species in the catalyst is the major factor that influences the enhanced activity for cyclohexane oxidation.
1867-3880
3291-3298
Betsy, Kurisingal J.
2dbddbcf-7333-41bf-9088-a9363ece67eb
Nayak, Chandrani
c9a25a6a-e637-442d-9461-bd9baba8e49e
Lazar, Anish
f01c546a-a2e1-4b7b-a121-dd6e06de6b61
Krishnan, Athira
1ee92fad-3b61-41a2-a6e0-4119ae17060b
Bhattacharyya, Dibyendu
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Jha, Shambhu N.
c96d812e-61a5-4183-b02d-5cad1261868a
Vinod, Chathakudath P.
02386bb6-9b4a-4904-99e2-8c7702ebf582
Betsy, Kurisingal J.
2dbddbcf-7333-41bf-9088-a9363ece67eb
Nayak, Chandrani
c9a25a6a-e637-442d-9461-bd9baba8e49e
Lazar, Anish
f01c546a-a2e1-4b7b-a121-dd6e06de6b61
Krishnan, Athira
1ee92fad-3b61-41a2-a6e0-4119ae17060b
Bhattacharyya, Dibyendu
6f389160-b1ca-4c48-8c4e-17c036f24a1e
Jha, Shambhu N.
c96d812e-61a5-4183-b02d-5cad1261868a
Vinod, Chathakudath P.
02386bb6-9b4a-4904-99e2-8c7702ebf582

Betsy, Kurisingal J., Nayak, Chandrani, Lazar, Anish, Krishnan, Athira, Bhattacharyya, Dibyendu, Jha, Shambhu N. and Vinod, Chathakudath P. (2018) Selective oxidation of cyclohexane to cyclohexanone using chromium oxide supported mesoporous MCM-41 nanospheres: Probing the nature of catalytically active chromium sites. ChemCatChem, 10 (15), 3291-3298. (doi:10.1002/cctc.201800309).

Record type: Article

Abstract

Highly dispersed chromium oxide supported mesoporous MCM‐41 nanosphere catalysts have been synthesized using a simple wet impregnation method. This work is devoted to a systematic study to reveal the active Cr sites in chromium oxide supported MCM‐41 nanosphere catalysts for the selective oxidation of cyclohexane to cyclohexanone. To probe the nature of the active species, we synthesized 0.5–10 wt % Cr loaded catalysts and characterized them by using XRD, UV/Vis spectroscopy, Raman spectroscopy, X‐ray photoelectron spectroscopy, extended X‐ray absorption fine structure analysis, X‐ray absorption near edge structure analysis, N2 sorption analysis, FTIR spectroscopy, 29Si NMR spectroscopy, SEM, and TEM. The liquid‐phase oxidation of cyclohexane to cyclohexanone (99 % selectivity) was performed under mild reaction conditions, and the results reveal clearly that the 5 wt % Cr loaded catalyst was optimum for the reaction. The initial composition of isolated Cr3+ species in the catalyst is the major factor that influences the enhanced activity for cyclohexane oxidation.

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e-pub ahead of print date: 23 April 2018
Published date: 13 August 2018

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Local EPrints ID: 431735
URI: http://eprints.soton.ac.uk/id/eprint/431735
ISSN: 1867-3880
PURE UUID: 8457d70f-ec64-4a64-a207-f59856a9fd30

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Date deposited: 14 Jun 2019 16:30
Last modified: 14 Jun 2019 16:30

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Contributors

Author: Kurisingal J. Betsy
Author: Chandrani Nayak
Author: Anish Lazar
Author: Athira Krishnan
Author: Dibyendu Bhattacharyya
Author: Shambhu N. Jha
Author: Chathakudath P. Vinod

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