Abstract
Menthol synthesis is possible through citral and citronellal hydrogenations via following multistage chemical reactions such as hydrogenation and cyclization. This research mainly focuses on a design of selective, active and cost-effective metal-acid (bifunctional) catalysts for menthol production via citral and citronellal hydrogenations. More specifically, Pd and Ni metals were impregnated over acidic support (e.g., hetero-poly acid supported montmorillonite, HPA_MM). The prepared catalysts were characterized by BET, pyridine adsorption and amine titration methods. Some of the most important parameters such as metal type and loading; applied pressure and reaction time have been investigated throughout this work. The obtained results reveals that the 8 wt% Ni-HPA-MM catalyst (Cat-5) has produced 63% menthols (initial reaction rate 0.126 mmol/min) from citral hydrogenation (80 °C, 1.0 MPa) within 24 h. Similarly, during lower applied pressure (0.5 MPa), the production of menthol was significantly improved (approximately 98% of menthol, initial reaction rate ~ 0.138 mmol/min) with the application of 8 wt% Ni-HPA-MM catalyst (Cat-5) in citronellal hydrogenation. Higher menthol selectivity was achieved from both reactions (citral and citronellal hydrogenation) which might be due to the presence of strong Lewis and medium Brønsted acid sites.
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Abbreviations
- MMT:
-
Montmorillonite
- HPA:
-
Heteropoly acid (20% loading of Phosphotungstic acid)
- MM:
-
Acid-treated montmorillonite
- HPA-MM:
-
Heteropoly acid (20% loading of Phosphotungstic acid) supported acid-treated montmorillonite
- Pd-HPA-MM:
-
Pd-loaded heteropoly acid supported acid-treated montmorillonite
- Ni-HPA-MM:
-
Nickel loaded heteropoly acid supported acid-treated montmorillonite
- Cat-1:
-
5 wt% Pd-MM
- Cat-2:
-
2.5 wt% Pd-HPA-MM
- Cat-3:
-
5 wt% Pd-HPA-MM
- Cat-4:
-
5 wt% Ni-HPA-MM
- Cat-5:
-
8 wt% Ni-HPA-MM
- CIT:
-
Citronellal
- IPOL:
-
Isopulegols
- MOL:
-
Menthols
- DHCIT:
-
Dihydrocitronellal
- DMOL:
-
3, 7-Dimethyl-1-octanol
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Shah, A.K., Maitlo, G., Shah, A.A. et al. One pot menthol synthesis via hydrogenations of citral and citronellal over montmorillonite-supported Pd/Ni-heteropoly acid bifunctional catalysts. Reac Kinet Mech Cat 128, 917–934 (2019). https://doi.org/10.1007/s11144-019-01679-6
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DOI: https://doi.org/10.1007/s11144-019-01679-6