Epoxidation of Cyclohexene with Air over the Composite Catalysts of Mn-mont Coordinated with Ligands

Abstract

The catalytic activity of the composite catalysts of Mn-mont (where mont represents montmorillonite) coordinated with ligands for the epoxidation of cyclohexene by air under Mukaiyama conditions was studied. The composite catalysts were characterized by atomic absorption spectroscopic analysis, elemental analysis, fourier transform infrared spectra, diffuse reflectance ultraviolet visible spectra, X-ray photoelectron spectroscopy, powder-X-ray-diffraction, and scanning electron microscopy measurements. The effects of various reaction conditions on the catalytic reaction were studied. Experimental results indicated that the catalysts performed excellent activity for the epoxidation of cyclohexene by air. Repeated runs indicate that the catalyst is stable for 3 cycles. The composite catalysts of Mn-mont coordinated with ligands are economical and environmentally friendly for the epoxidation of cyclohexene.

The effect of redox properties of ceria-supported vanadium oxides in liquid phase cyclohexene oxidation

“…6). 70,71 In the absence of catalyst, cyclohexene gave only 12% conversion; no epoxide was found. Through GC analysis, 1,2cyclohexanediol was not detected in the reaction mixture.…”

“…Through GC analysis, 1,2cyclohexanediol was not detected in the reaction mixture. 70,71 In the absence of catalyst, cyclohexene gave only 12% conversion; no epoxide was found. 72 Since the CeO 2 catalytic test gave a result similar to the one without catalyst, it can be concluded that the support was not active.…”

Novel pyridine Schiff base–manganese(ii) complexes: synthesis, characterization and catalytic reactivity of the epoxidation of cyclohexene

“…Jiang and Ma 3 reported that the Co(II)-Schiff base complex which was synthesized from salicylaldehyde was found to be an efficient catalyst for the oxidation of cyclohexene (94% conversion and 82% selectivity of epoxycyclohexane). Unfortunately, the selectivity of epoxycyclohexane in these methods was still lower than industrial standards and some methods 11,12 consumed a large amount of isobutyraldehyde.…”