| Autor: |
Kaya, Busra, Hamid, Mohammed Alfatih, Zengin, Yasar, Safak Boroglu, Mehtap, Boz, Ismail |
| Zdroj: |
Industrial & Engineering Chemistry Research; November 2024, Vol. 63 Issue: 45 p19486-19497, 12p |
| Abstrakt: |
This study investigates the catalytic dehydration of glycerol to acrolein using bulk WO3(b-WO3) and mesoporous WO3(m-WO3) catalysts with varying molar percentages of Nb. The mesoporous catalysts were synthesized via the nanocasting method using KIT-6 as hard templates. We optimized the molar ratio of Nb (0, 0.005, 0.01, 0.02), reaction temperature (260–340 °C), and liquid hourly space velocity to enhance the catalytic process. Among the catalysts tested, the m-WO3–Nb2O5(m-WNb) exhibited superior acrolein selectivity and stability compared to both m-WO3and b-WO3. The highest acrolein selectivity of 87% at 100% glycerol conversion was achieved with the m-WNb (1:0.01) catalyst under optimal conditions: 300 °C, a feed rate of 14.4 mL/h, and a glycerol concentration of 10 wt %. The study also examines the role of pore diameter and other factors influencing catalyst activity. Doping Nb into m-WO3enhanced both acrolein selectivity and structural stability, due to a significant increase in total acidity and the optimization of the Brønsted to Lewis acid site ratio, which are critical factors in maximizing acrolein production. |
| Databáze: |
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