A Kinetic Study of the Thermal and Photochemical Partial Oxidation of Cyclohexane with Molecular Oxygen in Zeolite Y

Larsen, Russell G.; Saladino, Alexander C.; Hunt, Thomas A.; Mann, Jennifer E.; Xu, Minhui; Grassian, Vicki H.; Larsen, Sarah C.

doi:10.1006/jcat.2001.3403

Cited by 36 publications

(37 citation statements)

References 41 publications

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“…These results show that when the temperature increased from 25 to 70 °C, the conversion and selectivity towards cyclohexanone and cyclohexanol increased and The second order plots gave a straight line, indicating that the reaction is of the 2 nd order, as shown in Figure 6. The activation energy, calculated from the slope of the straight line (Figure 6), is 31.23 kJ mol -1 , which is lower than the values reported in several previous works [42][43][44][45][46][47]. The effect of the mole ratio was examined by varying the cyclohexane/TBHP mole ratios (1:1 and 1:2), with 0.05 g of Ru/Al2O3 catalyst at 70 °C, for 6 h (Figure 7).…”

Section: Optimization Of Reaction Conditionscontrasting

confidence: 61%

Catalytic Properties of Alumina-Supported Ruthenium, Platinum, and Cobalt Nanoparticles towards the Oxidation of Cyclohexane to Cyclohexanol and Cyclohexanone

Rekkab-Hammoumraoui

Choukchou‐Braham

2017

Bull. Chem. React. Eng. Catal.

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A series of metal-loaded (Ru, Pt, Co) alumina catalysts were evaluated for the catalytic oxidation of cyclohexane using tertbutylhydroperoxide (TBHP) as oxidant and acetonitrile or acetic acid as solvent. These materials were prepared by the impregnation method and then characterized by Inductively Coupled Plasma-Optical Emission Spectroscopy (ICP-OES), H2 chemisorption, Fourier Transformed Infrared Spectroscopy (FTIR), High-Resolution Transmission Electron Microscopy (HRTEM), and X-ray Diffraction (XRD). All the prepared materials acted as efficient catalysts. Among them, Ru/Al2O3 was found to have the best catalytic activity with enhanced cyclohexane conversion of 36 %, selectivity to cyclohexanol and cyclohexanone of 96 % (57.6 mmol), and cyclohexane turnover frequency (TOF) of 288 h -1 .

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Section: Optimization Of Reaction Conditionscontrasting

confidence: 61%

Catalytic Properties of Alumina-Supported Ruthenium, Platinum, and Cobalt Nanoparticles towards the Oxidation of Cyclohexane to Cyclohexanol and Cyclohexanone

Rekkab-Hammoumraoui

Choukchou‐Braham

2017

Bull. Chem. React. Eng. Catal.

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“…Complete selectivity was reported due to (1) the diffusional constraints to avoid radical coupling reactions and (2) strong adsorption of partially oxidized products to avoid overoxidation. 9,[12][13][14] Activity was reported to increase in the order NaY < BaY < SrY < CaY caused by the increasing cation electrostatic field. 10,11 It must be stressed that the catalytic cycle has not yet been closed because the oxygenates formed are left adsorbed strongly in the zeolite.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ca²⁺ Position in Zeolite Y on Selective Oxidation of Propane at Room Temperature

Mojet

Ommen

et al. 2004

J. Phys. Chem. B

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The activity of CaNaY zeolites in selective oxidation of propane with increasing Ca 2+ content at room temperature was studied with infrared spectroscopy and ammonia temperature-programmed desorption. Increasing the Ca 2+ exchange level in CaNaY zeolites resulted in a variety of altered properties: the amount of Brönsted and Lewis acid sites increased, the adsorption of propane increased, the initial acetone formation rate increased, and the desorption of acetone retarded. Moreover, all of these properties showed a sudden change with Ca 2+ content above the 50% Na + exchange level, which can be fully attributed to the location of Ca 2+ in the Y-zeolite framework. It is convincingly shown that only Ca 2+ ions located in the supercage contribute to the formation of Brönsted and Lewis acidity as well as propane oxidation activity at room temperature.

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“…Cyclohexyl hydroperoxide as by-product was also observed. Cyclohexyl hydroperoxide was an intermediate which was converted to cyclohexanol and cyclohexanone [27][28][29]. Figure 6 also shows that in blank reaction condition, only cyclohexyl hydroperoxide was detected as the product.…”

Section: Oxidation Of Cyclohexanementioning

confidence: 91%

The Role of Ti and Lewis Acidity in Manganese Oxide Octahedral Molecular Sieves Impregnated with Titanium in Oxidation Reactions

Hayati

Chandren

Hamdan

et al. 2014

Bull. Chem. React. Eng. Catal.

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Octahedral manganese oxide molecular sieves (OMS-2) was prepared by precipitation method and modified by impregnation of titanium with different titanium/manganese (Ti/Mn) ratio. It was discovered that Ti/Mn ratio of less than 0.5 still retains the original pure cryptomelane structure of OMS-2. However, for sample with Ti/Mn ratio of more than 0.5, some rutile phases of titania (TiO2) can be detected together with the cryptomelane phase. Lewis acid sites were also observed in the titanium modified OMS-2 (Ti-OMS-2). Ti-OMS-2 was then used as catalysts for the oxidation of cyclohexane, cyclohexene and styrene, where Ti-OMS-2 with Ti/Mn ratio of 0.67 was most active in all three of the oxidation reactions as compared to TiO2 and OMS-2. The results suggest that both titanium sites in framework and non-framework and the Lewis acidity created by the impregnation of Ti, increased the activity of OMS-2 in oxidation reactions.

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A Kinetic Study of the Thermal and Photochemical Partial Oxidation of Cyclohexane with Molecular Oxygen in Zeolite Y

Cited by 36 publications

References 41 publications

Catalytic Properties of Alumina-Supported Ruthenium, Platinum, and Cobalt Nanoparticles towards the Oxidation of Cyclohexane to Cyclohexanol and Cyclohexanone

Catalytic Properties of Alumina-Supported Ruthenium, Platinum, and Cobalt Nanoparticles towards the Oxidation of Cyclohexane to Cyclohexanol and Cyclohexanone

Effect of Ca²⁺ Position in Zeolite Y on Selective Oxidation of Propane at Room Temperature

The Role of Ti and Lewis Acidity in Manganese Oxide Octahedral Molecular Sieves Impregnated with Titanium in Oxidation Reactions

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A Kinetic Study of the Thermal and Photochemical Partial Oxidation of Cyclohexane with Molecular Oxygen in Zeolite Y

Cited by 36 publications

References 41 publications

Catalytic Properties of Alumina-Supported Ruthenium, Platinum, and Cobalt Nanoparticles towards the Oxidation of Cyclohexane to Cyclohexanol and Cyclohexanone

Catalytic Properties of Alumina-Supported Ruthenium, Platinum, and Cobalt Nanoparticles towards the Oxidation of Cyclohexane to Cyclohexanol and Cyclohexanone

Effect of Ca2+ Position in Zeolite Y on Selective Oxidation of Propane at Room Temperature

The Role of Ti and Lewis Acidity in Manganese Oxide Octahedral Molecular Sieves Impregnated with Titanium in Oxidation Reactions

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Effect of Ca²⁺ Position in Zeolite Y on Selective Oxidation of Propane at Room Temperature