Microwave-assisted condensation approach for vanadium silicate microspheres and their catalytic activity in cyclohexene epoxidation and ethyl lactate oxidation
| Autoři | |
|---|---|
| Rok publikování | 2025 |
| Druh | Článek v odborném periodiku |
| Časopis / Zdroj | Journal of Industrial and Engineering Chemistry |
| Fakulta / Pracoviště MU | |
| Citace | |
| www | https://www.sciencedirect.com/science/article/pii/S1226086X25000024?via%3Dihub |
| Doi | http://dx.doi.org/10.1016/j.jiec.2025.01.003 |
| Klíčová slova | Vanadium silicate; Microspheres; Catalyst; Epoxidation; Ethyl lactate oxidation |
| Popis | A novel, highly efficient condensation approach for the preparation of heterogeneous vanadium silicate microspherical catalyst is introduced. This synthetic method is based on a microwave-assisted preparation of hybrid vanadium biphenyl dicarboxylate-based precursor solution and subsequent condensation with (3-ami-nopropyl)triethoxysilane. The as-prepared hybrid metallosilicate is then calcined at 500 degrees C to obtain amorphous and porous vanadium silicate microspheres with highly dispersed vanadium species inserted into the silicate matrix. This catalyst with 2.85 wt% of vanadium contains evenly distributed VOx species, which possesses high catalytic activity in a cyclohexene epoxidation reaction, reaching a conversion of 54 % after 4 h with 92 % selectivity to cyclohexene oxide. The catalyst's TOF value achieved 220 h-1, indicating its high performance compared to vanadium-containing catalyst analogs. Furthermore, a significant catalytic activity of prepared vanadium silicate microspheres in ethyl lactate oxidation to ethyl pyruvate with the conversion of 21 % at mild conditions shows a high potential of the catalyst for industrial application compared to the contemporary V2O5 heterogeneous catalyst. |
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