Highly Efficient Conversion of Glycerol to Acetaldehyde Over In₂O₃/HZSM-5 Catalysts
2022
The dehydration of glycerol, a major byproduct from biodiesel production, is a key step for the production of acetaldehyde. However, the selectivity toward acetaldehyde is presently not satisfactory. In the present work, In₂O₃ supported on the HZSM-5 zeolite was prepared by a simple impregnation method and applied as a tandem catalyst for glycerol dehydration. Surprisingly, the 3%In₂O₃/HZSM-5(500) catalyst exhibits a high selectivity to acetaldehyde of 80% with a glycerol conversion of 100% at a reaction temperature of 340 °C. The characterization results showed that the amount of total acidity and Brønsted acid sites decreased, while the amount of Lewis acid sites increased, after the introduction of In₂O₃ into the HZSM-5(500) zeolite, which is responsible for the high selectivity to acetaldehyde.
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