Epoxidation of cyclohexene over basic mixed oxides derived from hydrotalcite materials: Activating agent, solvent and catalyst reutilization

Romero, M.D.; Calles, J.A.; Ocana, M. A.; Gómez, J.M.

doi:10.1016/j.micromeso.2007.07.041

Cited by 32 publications

(18 citation statements)

References 41 publications

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“…For precursors Cu 11.2 -MgAl and Ni 4.7 -MgAl, the peaks at 11.7°, 23.6°, 35.0°, 39.7°, 47.1°, 60.9° and 62.4° could be observed, which were assigned to (003), (006), (009), (105), (108), (110) and (113) diffractions of hydrotalcite-like compounds, [22][23][24][25] respectively, indicating that the obtained samples exhibited a perfect hydrotalcite-like structure. However the disappearance of (105), (108), (110) and (113) diffractions and the abatement of (003), (006) and (009) diffractions were observed after the calcination, and the Ni-promoted Cu 11.2 -MgAlO samples calcined at 500 ℃ almost had no typical hydrotalcite-like diffraction peaks.…”

Section: Xrd Resultsmentioning

confidence: 99%

Furfural Hydrogenation on Nickel-promoted Cu-containing Catalysts Prepared from Hydrotalcite-Like Precursors

Zheng

Liu

et al. 2011

Chin. J. Chem.

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The nickel-promoted Cu-containing catalysts (Cu x Ni y -MgAlO) for furfural (FFR) hydrogenation were prepared from the hydrotalcite-like precursors, and characterized by X-ray powder diffraction, inductively-coupled plasma atomic emission spectroscopy, N 2 adsorption-desorption, UV-Vis diffuse reflectance spectra and temperatureprogrammed reduction with H 2 in the present work. The obtained catalysts were observed to exhibit a better catalytic property than the corresponding Cu-MgAlO or Ni-MgAlO samples in FFR hydrogenation, and the CuNi-MgAlO catalyst with the actual Cu and Ni loadings of 12.5 wt% and 4.5 wt%, respectively, could give the highest FFR conversion (93.2%) and furfuryl alcohol selectivity (89.2%). At the same time, Cu 0 species from the reduction of Cu 2＋ ions in spinel phases were deduced to be more active for FFR hydrogenation.

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Section: Xrd Resultsmentioning

confidence: 99%

Furfural Hydrogenation on Nickel-promoted Cu-containing Catalysts Prepared from Hydrotalcite-Like Precursors

Zheng

Liu

et al. 2011

Chin. J. Chem.

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“…In addition, H 2 O 2 is inexpensive, economical, safe, clean, and also environmentally friendly [7].…”

Section: Introductionmentioning

confidence: 99%

“…However, the use of homogeneous catalysts causes many disadvantages, particularly difficult separation and complicated recovery steps for reuse of the complex catalysts. Therefore, the substitution of the homogeneous catalysts with heterogeneous catalysts helps to alleviate the above mentioned problems, allowing for catalyst reuse and ease of waste stream treatment [7,8]. Some heterogeneous catalysts have been reported to be active for the cyclohexene epoxidation, such as TiO 2 -SiO 2 [9,10], Al 2 O 3 [11], ReO 4 -SiO 2 ÁAl 2 O 3 and ReO 4 -Al 2 O 3 [12], Ti-supported SiO 2 [13], Mo-incorporated silicalite [14], Ti-grafted MCM-41 [15], Co-exchanged zeolite X [16], and Fe/CeO 2 [17].…”

Section: Introductionmentioning

confidence: 99%

Liquid-Phase Cyclohexene Epoxidation with H2O2 over RuO2-Loaded Mesoporous-Assembled TiO2 Nanocrystals: Catalyst Preparation and Recyclability

2010

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The purpose of this work was to investigate the liquid-phase cyclohexene epoxidation with H 2 O 2 using RuO 2 -loaded mesoporous-assembled TiO 2 nanocrystals. The loading of RuO 2 on the mesoporous-assembled TiO 2 was performed by two methods: (1) incipient wetness impregnation (IWI) (RuO 2 /TiO 2 (IWI)) and (2) single-step sol-gel (SSSG) (RuO 2 /TiO 2 (SSSG)). Among the investigated RuO 2 /TiO 2 (IWI) and RuO 2 /TiO 2 (SSSG) catalysts, 1 mol.% RuO 2 /TiO 2 (SSSG) calcined at 450°C was found to possess relatively high catalytic performance based on the cyclohexene conversion and cyclohexene oxide selectivity. The recyclability of the RuO 2 /TiO 2 (IWI) and RuO 2 / TiO 2 (SSSG) catalysts was also investigated. It was found that after three consecutive catalytic reaction cycles, the RuO 2 /TiO 2 (IWI) exhibited a slight decrease in cyclohexene conversion, but a significant decrease in cyclohexene oxide selectivity. On the other hand, the RuO 2 /TiO 2 (SSSG) exhibited almost unchanged conversion and cyclohexene oxide selectivity, indicating its much higher stability. XRF and TPR results indicate that the high stability of the RuO 2 /TiO 2 (SSSG) is due to the strong metal oxide-support interaction.

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“…There has been a great deal of interest in the catalytic epoxidation of alkenes, as epoxides can be easily transformed into a large variety of bifunctional compounds by means of regioselective ring opening reactions [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…The epoxidation of cyclohexene by hydrogen peroxide and benzonitrile with methanol as solvent using solid base catalysts, hydrotalcites, and corresponding mixed oxides, was investigated by Angelescu et al [14]. Romero et al [1] reported that basic hydrotalcite-like derived catalysts were tested in catalytic cyclohexene epoxidation by hydrogen peroxide using several nitriles and amides as activating agents.…”

Section: Introductionmentioning

confidence: 99%

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

Jiang

Zhen

et al. 2009

Catal Lett

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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.

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Epoxidation of cyclohexene over basic mixed oxides derived from hydrotalcite materials: Activating agent, solvent and catalyst reutilization

Cited by 32 publications

References 41 publications

Furfural Hydrogenation on Nickel-promoted Cu-containing Catalysts Prepared from Hydrotalcite-Like Precursors

Furfural Hydrogenation on Nickel-promoted Cu-containing Catalysts Prepared from Hydrotalcite-Like Precursors

Liquid-Phase Cyclohexene Epoxidation with H2O2 over RuO2-Loaded Mesoporous-Assembled TiO2 Nanocrystals: Catalyst Preparation and Recyclability

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

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