A spectroscopic study on the reaction-controlled phase transfer catalyst in the epoxidation of cyclohexene

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.

Section: Introductionmentioning

confidence: 99%

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

Jiang

Zhen

et al. 2009

“…In industries it is used for the production of adipic acid. The direct oxidation of hydrocarbons to form epoxides is one of the most important reactions because of its applications in organic synthesis, food, agrochemicals and pharmaceutical industries [1,2].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Catalytic Activity of Ti, V, Mn-Grafted Silica Spheres Towards Epoxidation Reaction

Das

Parida

2008

A simple, cost effective and reusable transition metal (M = Ti, V, Mn)-grafted mesoporous silica spheres were synthesized by sol-gel technique and characterized by SXRD, FTIR, UV-Vis DRS, SEM, EDS, BET-surface area, pore volume and average pore diameter. Epoxidation of cyclohexene to cyclohexene oxide over these modified silica spheres using TBHP as oxidant was performed to compare the catalytic activities. Cyclohexene oxide selectivity was recorded to be 87.5% with 72.5% conversion over 8 wt% Ti-grafted silica spheres in comparison to V and Mn-grafted catalysts.

“…The direct oxidation of hydrocarbons to form epoxides is one of the most important reactions in organic synthesis because of its applications in food, agrochemical and pharmaceutical industries [1,2]. Catalysts based on Ti and Si belong to the most powerful heterogeneous epoxidation catalysts known today [3].…”

Section: Introductionmentioning

confidence: 99%

Catalytic Characterization of Mesoporous Ti–Silica Hollow Spheres

Bača

et al. 2006

Titanium-silica hollow spheres (TSHS) with a mesoporous shell were synthesized using an inverse multiple oil-water-oil (O/W/ O) emulsion. These novel materials show interesting potential for catalysis. Excellent catalytic performance was found in the epoxidation of cyclohexene with tert-butylhydroperoxide. The investigation of the titanium environment by UV-vis, Raman and FTIR spectroscopy showed that at low Ti loading only isolated species are present and catalytic measurements demonstrated that these species are the active sites for this reaction. At higher loading Ti-O-Ti microdomains are present and they do not exhibit any significant catalytic activity.