Abstract
In the current work gold nanoparticles supported on oxides (MgO, Al2O3, ZrO2, TiO2) were used for menthylamine synthesis via menthone oxime hydrogenation. An increase of the gold nanoparticles size and application of metal oxides with a strong basic character such as magnesia favored deoximation to menthone. Au/Al2O3 catalyst with the gold nanoparticles size of 2.0 nm afforded high catalytic activity and selectivity to menthylamine. The reaction kinetics including stereoselectivity to the reaction products and recyclability of the catalyst was studied using Au/Al2O3 in the temperature range 90−110 °C under hydrogen pressure of 5.5–7.5 bar. The catalytic behavior was influenced by the solvent nature, with higher selectivity to desired amine achieved using methanol. The reaction rate was pressure independent, while has first order with respect to menthone oxime concentration. Stereoselectivity to menthylamines and menthones was independent on the reaction temperature and the hydrogen pressure.
| Original language | English |
|---|---|
| Article number | 117799 |
| Journal | Applied Catalysis A: General |
| Volume | 605 |
| DOIs | |
| Publication status | Published - 5 Sept 2020 |
| MoE publication type | A1 Journal article-refereed |
Funding
The authors acknowledge the Multi-Access Chemical Research Center SB RAS and the Center of Collective Use «National Center of Catalyst Research» of Boreskov Institute of Catalysis for spectral and analytical measurements. This work was supported by the Russian Foundation for Basic Research grant № 18-33-20175 and by Ministry of Science and Higher Education of the Russian Federation project no. АААА-А17-117041710075-0.
Keywords
- Biomass
- Gold catalyst
- Kinetics
- Menthylamine
- Oxime hydrogenation
- Terpenoids