A promising approach to transform levulinic acid into γ-valerolactone using niobic acid photocatalyst and the accumulated electron transfer technique
| Autor: | José B.G. Filho, Klaus Krambrock, Daniele C. Ferreira, Márcio C. Pereira, Luiz C.A. Oliveira, Henrique F.V. Victória, Carlos Giovani Oliveira Bruziquesi, Regiane D.F. Rios |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Spin trapping Process Chemistry and Technology Inorganic chemistry Substrate (chemistry) 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis 0104 chemical sciences law.invention Electron transfer chemistry.chemical_compound chemistry law Photocatalysis Levulinic acid Titration 0210 nano-technology Electron paramagnetic resonance Selectivity General Environmental Science |
| Zdroj: | Applied Catalysis B: Environmental. 285:119814 |
| ISSN: | 0926-3373 |
| DOI: | 10.1016/j.apcatb.2020.119814 |
| Popis: | The photocatalytic production of γ-valerolactone (GVL) from levulinic acid (LA) was performed using the UV-assisted accumulated electron transfer technique. For this purpose, a commercial niobic acid (HY-340) produced by Companhia Brasileira Metalurgia e Mineralurgia (CBMM) was used as photocatalyst. HY-340 showed higher efficiency in ethanol (a hole scavenger) and additional contact time with the substrate (48 h in the dark) after the reaction under UV light. Longer illumination time leads to the conversion of by-products to GVL with maximum selectivity of 44.7 %. Electron paramagnetic resonance (EPR) measurements allied with the spin trapping method indicated the reduction process occurs through the transfer of H • . Finally, O2 pulse titration was developed to quantify the electrons accumulated in the HY-340 conduction band. From this experiment, a significant TOF value was calculated to 3.3 × 10−6 s-1 considering that experiments were conducted at room temperature and ambient pressure. |
| Databáze: | OpenAIRE |
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