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Citation: Ashif H. Tamboli, Avinash A. Chaugule, Faheem A. Sheikh, Wook-Jin Chung, Hern Kim. Synthesis, characterization, and application of silica supported ionic liquid as catalyst for reductive amination of cyclohexanone with formic acid and triethyl amine as hydrogen source[J]. Chinese Journal of Catalysis, ;2015, 36(8): 1365-1371. doi: 10.1016/S1872-2067(15)60848-8 shu

Synthesis, characterization, and application of silica supported ionic liquid as catalyst for reductive amination of cyclohexanone with formic acid and triethyl amine as hydrogen source

1.
Department of Energy Science and Technology, Energy and Environment Fusion Technology Center, Myongji University, Yongin, Kyonggi-do 449-728, Republic of Korea

Corresponding author: Hern Kim,
Received Date: 24 February 2014
Available Online: 26 March 2015
Fund Project: This work was supported by the National Research Foundation of Korea (NRF)-Grants funded by the Ministry of Science, ICT and Future Planning (2014R1A2A2A01004352) (NRF)-Grants funded by the Ministry of Science, ICT and Future Planning (2014R1A2A2A01004352)the Ministry of Education (2009-0093816) (2009-0093816)

A silica supported ionic liquid was synthesized and characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy, X-ray diffraction, N₂ adsorption-desorption, and thermogravimetric analysis. All these techniques, especially SEM results indicated the presence of well-defined spherical particles having diameters larger than the pristine silica particles, confirming the successful immobilization of the ionic liquid. The prepared silica supported ionic liquid was used in the reductive amination of cyclohexanone under different conditions with different azeotropic mixtures of formic acid and triethyl amine as a hydrogen source. The catalyst showed efficient catalytic performance and excellent yields of N-cyclohexyl amine derivatives in the range of 58% to 84% at 30 ℃. After completion of the reaction, the catalyst was easily recovered by simple filtration and reused for another five cycles without any significant impact on product yields. The obtained catalytic performance indicates that the present catalyst is green, very active, and reusable for the reductive amination of cyclohexanone.
- Supported ionic liquid phase,
- Catalyst,
- Reductive amination,
- Cyclohexanone,
- Ionic liquids
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