Heterolytic Alkene Oxidation with H2O2 Catalyzed by Nb-Substituted Lindqvist Tungstate Immobilized on Carbon Nanotubes Full article
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Catalysis Science and Technology
ISSN: 2044-4753 , E-ISSN: 2044-4761 |
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| Output data | Year: 2021, Volume: 11, Number: 9, Pages: 3198–3207 Pages count : 10 DOI: 10.1039/d1cy00153a | ||||
| Tags | metal-organic framework; silanol-functionalized polyoxotungstates; selective oxidation; containing polyoxometalate; heterogeneous catalysts; molecular-models; highly efficient; alpha-pinene; epoxidation; silica | ||||
| Authors |
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| Affiliations |
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Funding (2)
| 1 | Ministry of Science and Higher Education of the Russian Federation | 0239-2021-0009 |
| 2 | Russian Foundation for Basic Research | 19-03-00172 |
Abstract:
Nb-monosubstituted polyoxometalates (Nb-POM) of the Lindqvist structure, monomers [Nb(L)W5О19]n- (Nb(L)W5, L = O, OCH3, (O)2; n = 3 or 2) and dimer [(NbW5O18)2O]4-, were successfully immobilized on N-free and N-doped carbon nanotubes (CNTs and N-CNTs) and characterized by elemental analysis, N2 adsorption, XPS, FTIR spectroscopy, HR-TEM, and HAADF-STEM. The supported catalysts revealed superior activity and selectivity for the heterolytic oxidation of alkenes with aqueous hydrogen peroxide as green oxidant to produce epoxides and diols as the principle oxidation products. Both CNTs and N-CNTs stabilize the monomeric form [Nb(OH)W5O18]2-, preventing its deactivation through dimerization and thereby leading to a great increase in the catalyst activity and productivity relative to homogeneous Nb(L)W5. Although N-doping ensures a more homogeneous dispersion of Nb-POM on the surface, it enhances unproductive decomposition of the oxidant, leading to the enhancement of homolytic oxidation routes. The elaborated Nb-POM/CNTs catalysts reveal the truly heterogeneous nature of the catalysis, can be easily recovered by filtration, regenerated, and reused several times without a significant loss of the catalytic performance.
Cite:
Evtushok V.Y.
, Ivanchikova I.D.
, Lopatkin V.A.
, Maksimchuk N.V.
, Podyacheva O.Y.
, Suboch A.N.
, Stonkus O.A.
, Kholdeeva O.A.
Heterolytic Alkene Oxidation with H2O2 Catalyzed by Nb-Substituted Lindqvist Tungstate Immobilized on Carbon Nanotubes
Catalysis Science and Technology. 2021. V.11. N9. P.3198–3207. DOI: 10.1039/d1cy00153a WOS Scopus РИНЦ OpenAlex AN
Heterolytic Alkene Oxidation with H2O2 Catalyzed by Nb-Substituted Lindqvist Tungstate Immobilized on Carbon Nanotubes
Catalysis Science and Technology. 2021. V.11. N9. P.3198–3207. DOI: 10.1039/d1cy00153a WOS Scopus РИНЦ OpenAlex AN
Dates:
| Submitted: | Jan 27, 2021 |
| Accepted: | Feb 22, 2021 |
| Published online: | Feb 22, 2021 |
| Published print: | May 7, 2021 |
Identifiers:
| ≡ Web of science: | WOS:000649070900017 |
| ≡ Scopus: | 2-s2.0-85106056646 |
| ≡ Elibrary: | 46080157 |
| ≡ OpenAlex: | W3132780045 |
| ≡ Chemical Abstracts: | 2021:482814 |