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Using Mg-Al mixed oxide and reconstructed hydrotalcite as basic catalysts for aldol condensation of furfural and cyclohexanone
ChemCatChem, Vol. 10, Issue 6, Pages 1464-1475
- Category: Článek v odborném periodiku (Article in a professional journal)
- Author: Kadlec David, Kikhtyanin Oleg, Kubička David, Velvarská Romana
- ISSN: 1867-3899
- Year: 2018
- Link: URL
- DOI: 10.1002/cctc.201701880
Review
This study presents results on aldol condensation of furfural and cyclohexanone in presence of Mg-Al hydrotalcite-derived materials as solid basic catalysts at reaction temperature from 25 to 90 st. C and cyclohexanone to furfural molar ratio of 1-10. Mg-Al mixed oxide exhibited reasonable activity with furfural conversion of ca. 50% after 180 min of the reaction at T=90 st. C. The activity of reconstructed hydrotalcite was much higher with furfural conversion close to 100% at short reaction times. In comparison with Mg-Al mixed oxide, the initial reaction rate has increased 30-50 times. At similar reaction conditions cyclohexanone self-condensation on HTC-derived catalysts could not compete with aldol condensation because the former reaction was inhibited by produced water. The change in CH/F molar ratio influenced both furfural conversion and product selectivity, higher furfural content in the reaction mixture favored the second condensation step.