Abstract
Here, the efficient synthesis of butadiene from aqueous ethanol was achieved over a series of x%LaZnZr/Si-beta multifunctional catalysts prepared by wet impregnation method. La species played a crucial role in improving the physicochemical properties and catalytic performance of the ZnZr/Si-beta catalyst. The structure and physicochemical properties of the synthesized catalysts were analyzed by multiple characterization technique. The characterization results revealed that the introduction of La species into ZnZr/Si-beta catalyst created a new La-O-Si bond, and rationally modified the acid-base properties. The La species substantially improved the main reaction of aldol condensation and inhibited the ethanol dehydration, as demonstrated by ethanol-TPD and TPSR studies. In addition, the adsorption capacity of water vapor was remarkably suppressed. A remarkable butadiene selectivity of 60.6 % and ethanol conversion of 83.4 % were achieved on the 5 %LaZnZr/Si-beta catalyst. This enhancement of butadiene selectivity and catalytic activity is very helpful for the development of novel efficient multifunctional catalysts for the direct synthesis butadiene from aqueous ethanol.
Original language | English |
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Article number | 113800 |
Journal | Catalysis Today |
Volume | 411-412 |
DOIs | |
State | Published - 2023/03/01 |
Keywords
- Aldol condensation
- Aqueous ethanol
- Butadiene
- Lanthanum
- Water vapor effect
ASJC Scopus subject areas
- Catalysis
- General Chemistry