Vanadium C-scorpionate supported on mesoporous aptes-functionalized SBA-15 as catalyst for the peroxidative oxidation of benzyl alcohol
| Autor: | Elisabete C. B. A. Alegria, Carlos M. Granadeiro, Luís Manuel Mendes Correia, Mohamed M. A. Soliman, Armando J. L. Pombeiro, Salete S. Balula, Luísa M. D. R. S. Martins |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Composite number
Vanadium chemistry.chemical_element 02 engineering and technology 010402 general chemistry Heterogeneous catalysis 01 natural sciences Catalysis chemistry.chemical_compound Oxidation General Materials Science General Chemistry Vanadium complex Mesoporous silica 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences SBA-15 chemistry Heterogenization Mechanics of Materials Benzyl alcohol C-scorpionate Catalyst 0210 nano-technology Mesoporous material Nuclear chemistry BET theory |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| Popis: | The neutral trichloro[hydrotris(1-pyrazolyl)methane]vanadium(III) [VCl3(Tpm)] (Tpm = HC(pz)3; pz = pyrazolyl) C-scorpionate complex was immobilized on amine-functionalized mesoporous silica (aptesSBA-15) via an impregnation method forming the [VCl3(Tpm)]@aptesSBA-15 composite. The immobilization of the vanadium compound was confirmed by several characterization techniques, namely SEM/EDS, powder XRD, FT-IR/ATR, ICP and BET surface area analysis, revealing the successful incorporation of the complex, and confirming the structural and morphological preservation of the porous support and the vanadium complex. The vanadium composite was tested as heterogeneous catalyst for the peroxidative oxidation of benzyl alcohol under mild conditions and its catalytic performance was compared to that of the analogous homogeneous [VCl3(Tpm)] complex. The catalytic studies were extended to other substrates. The effect of various parameters, such as amount and type of oxidant, catalyst and additives, temperature and reaction time were investigated allowing to reach overall yields of ca. 60% and turnover numbers (TONs) up to ca. 7.6 × 103. The results obtained demonstrated the higher performance of the heterogeneous catalyst using much less [VCl3(Tpm)] complex under a solvent-free system. Furthermore, consecutive reaction cycles could be performed, showing its recycling capacity. Structural stability was also investigated, indicating the viability of the vanadium C-scorpionate composite as catalyst for other oxidative reactions with high industrial interest. |
| Databáze: | OpenAIRE |
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