Reforming of n-hexane in presence of [1,2-bis(salicylidene amino)-phenylene]–zirconium complex chemically bound on modified silica gel support

Anisia, K.S.; Mishra, Gopal S.; Kumar, Anil

doi:10.1016/j.molcata.2004.01.011

Cited by 9 publications

(5 citation statements)

References 17 publications

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“…For CoV/alumina 38 and Co/ZSM-5 39 catalysts, the ratio is close to 1. For Zr/silica catalyst, the products obtained were cyclohexanol and cyclohexene and cannot be shown in this figure. For FeCuL 1 /alumina, cyclohexanone is the only product, and therefore, R cannot be calculated. …”

Section: Resultsmentioning

confidence: 98%

“…Figure 12a shows the effect of temperature on cyclohexane conversion at 8 h residence time for different catalysts. For salen complex catalysts (Zr/silica 37 and Co/silica 12 ), the conversion at 8 h of reaction increases with temperature, whereas for the macrocyclic complex catalysts (ZrZr/alumina and CoV/alumina 38 ) and Co/ ZSM-5 catalyst, 39 the conversion starts to decrease after a particular temperature. The explanation of this observation is inherent in the fact that the steady-state approximation is not valid and various reaction parameters interact to give reduced intermediate concentration and, hence, conversion.…”

Section: Comparison Of Our Work Withmentioning

confidence: 97%

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Heteronuclear Macrocyclic Iron−Copper Complex Catalyst Covalently Bonded to Modified Alumina Catalyst for Oxidation of Cyclohexane

Kishore

Kumar

2007

Ind. Eng. Chem. Res.

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In this paper, we report the synthesis of FeCuL 1 and FeCuL 2 complexes of 2,6-diformyl-4-methylphenol and 1,2-phenylenediamine (L 1 ) and 2,6-diformyl-4-methylphenol and 1,3-diaminopropane (L 2 ). The FeCuL 1 complex has been covalently bonded to alumina and used as a catalyst for the oxidation of cyclohexane. The complex catalyst thus-prepared was found to be thermally stable and was completely characterized by CHN, scanning electron microscopy-energy dispersive X-ray analysis (SEM-EDAX), thermogravimetric analysis (TGA), Fourier transform infrared (FTIR), and NMR spectroscopy. The oxidation of cyclohexane has been carried out using molecular oxygen without any solvent, coreactant, or cocatalyst in the temperature range (398-483 K) with cyclohexanone as the only product. The GC-MS of the product formed showed the total conversion was as much as 7.7%. In order to explain the experimental data, a possible reaction mechanism has been proposed and rate constants (assuming single phase) at different temperatures were determined using an optimal curve fitting by applying genetic algorithm. The rate constants thus-determined were found to be functions of temperature only. From experiments carried out at different temperatures, we found that, for every rate constant, an Arrhenius-type relation could be established.

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Section: Resultsmentioning

confidence: 98%

Section: Comparison Of Our Work Withmentioning

confidence: 97%

Heteronuclear Macrocyclic Iron−Copper Complex Catalyst Covalently Bonded to Modified Alumina Catalyst for Oxidation of Cyclohexane

Kishore

Kumar

2007

Ind. Eng. Chem. Res.

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“…Figure 6a shows the effect of temperature on cyclohexane conversion at 8 h residence time for different catalysts. For salen complex catalysts (Zr/Silica43 and Co/Silica12), the conversion at 8 h of reaction increases with temperature, whereas for the macrocyclic complex catalysts (ZrZr/Alumina and CoV/Alumina54) and Co/ZSM‐5 catalyst,55 the conversion starts to decrease after a particular temperature. The explanation of this observation is inherent in the fact that the steady state approximation is not valid, and various reaction parameters interact to give reduced intermediate concentration and hence conversion.…”

Section: Resultsmentioning

confidence: 99%

“…These complexes are known to provide new reactivity patterns, because the interactions between the metals in these complexes help in promoting reaction as they will have greater oxidizing power. Some of the macrocyclic complexes used in catalyzing chemical reactions are given in Refs 27–44,. and these have been used as catalysts in chemical reactions.…”

Section: Introductionmentioning

confidence: 99%

Kinetic study of oxidation of cyclohexane using complex catalyst

Kishore

Kumar

2007

AIChE Journal

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With an effort to use a multimetallic catalyst system for oxidation of cyclohexane using oxygen, a binuclear monometallic macrocyclic ZrZr complex was prepared and covalently bonded to modified alumina support. The complex catalyst thus prepared was found to be thermally stable and was completely characterized by CHN, SEM‐EDAX, TGA, and FTIR analysis. We carried out liquid phase oxidation of cyclohexane using molecular oxygen without any solvent, coreactant, or cocatalyst at considerably mild reaction conditions (150°C, 27 atm) with extremely high selectivity. The GC‐MS of the liquid product formed showed the total conversion of as much as 19% having cyclohexanone and cyclohexanol in the ratio of 16:1. To explain the experimental data, a possible reaction mechanism has been proposed and rate constants (assuming single phase) at different temperatures were determined using an optimal curve fitting by applying genetic algorithm. We showed that the steady state approximation cannot be assumed, and for the pressure range studied (7–35 atm), the rate constants thus determined were found to be a function of temperature only. From experiments carried out at different temperatures, we found that for every rate constant, an Arrhenious type relation could be established. © 2007 American Institute of Chemical Engineers AIChE J, 2007

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“…The structure, strong acidity and WO x species 1-10 resulted to be important for their activity in the isomerization reaction of light paraffins and their platinum content to activate-dissociate the molecular hydrogen and/or hydrogenate olefinic intermediates. [9][10][11] The hydro-isomerization of paraffins is an important reaction for the production of quality gasoline and diesel fuels. [5][6][7][8] Zirconia catalysts (Pt/WO x -ZrO 2 ) were supposed to remove disadvantages related to environmental concerns of traditional commercial alumina-based 7,8 catalysts doped by chlorine and at the same time to reach sufficient activity and selectivity for n-alkane skeletal isomerization.…”

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confidence: 99%

From laboratory catalysts to a new prototype: a novel real candidate for the isomerization of C5–C6 paraffins

Hidalgo

Kaucký

Bortnovský³

et al. 2015

RSC Adv.

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Reforming of n-hexane in presence of [1,2-bis(salicylidene amino)-phenylene]–zirconium complex chemically bound on modified silica gel support

Cited by 9 publications

References 17 publications

Heteronuclear Macrocyclic Iron−Copper Complex Catalyst Covalently Bonded to Modified Alumina Catalyst for Oxidation of Cyclohexane

Heteronuclear Macrocyclic Iron−Copper Complex Catalyst Covalently Bonded to Modified Alumina Catalyst for Oxidation of Cyclohexane

Kinetic study of oxidation of cyclohexane using complex catalyst

From laboratory catalysts to a new prototype: a novel real candidate for the isomerization of C5–C6 paraffins

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