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One-Pot Transformation of Citronellal to Menthol Over H-Beta Zeolite Supported Ni Catalyst: Effect of Catalyst Support Acidity and Ni Loading.
- Source :
- Catalysis Letters; Sep2023, Vol. 153 Issue 9, p2674-2692, 19p
- Publication Year :
- 2023
-
Abstract
- Citronellal was converted to menthol in a one-pot approach using H-Beta zeolite-based Ni catalyst in a batch reactor at 80 °C, under 20 bar of total pressure. The effects of H-Beta acidity (H-Beta-25 with the molar ratio SiO<subscript>2</subscript>/Al<subscript>2</subscript>O<subscript>3</subscript> = 25 and H-Beta-300 with SiO<subscript>2</subscript>/Al<subscript>2</subscript>O<subscript>3</subscript> = 300) and Ni loading (5, 10 and 15 wt %) on the catalytic performance were investigated. Ni was impregnated on H-Beta support using the evaporation-impregnation method. The physico-chemical properties of the catalysts were characterized by XRD, SEM, TEM, ICP-OES, N<subscript>2</subscript> physisorption, TPR, and pyridine adsorption–desorption FTIR techniques. Activity and selectivity of catalysts were strongly affected by the Brønsted and Lewis acid sites concentration and strength, Ni loading, its particle size and dispersion. A synergetic effect of appropriate acidity and suitable Ni loading in 15 wt.% Ni/H-Beta-25 catalyst led to the best performance giving 36% yield of menthols and 77% stereoselectivity to (±)-menthol isomer at 93% citronellal conversion. Moreover, the catalyst was successfully regenerated and reused giving similar activity, selectivity and stereoselectivity to the desired (±)-menthol isomer as the fresh one. [ABSTRACT FROM AUTHOR]
- Subjects :
- CATALYST supports
MENTHOL
CATALYST selectivity
ACIDITY
ZEOLITES
Subjects
Details
- Language :
- English
- ISSN :
- 1011372X
- Volume :
- 153
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- Catalysis Letters
- Publication Type :
- Academic Journal
- Accession number :
- 169911271
- Full Text :
- https://doi.org/10.1007/s10562-022-04178-x