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Parentis, Mónica Liliana; Bonini, Norberto Alejandro; Gonzo, Elio Emilio

doi:10.1023/a:1016523608979

Cited by 13 publications

(9 citation statements)

References 4 publications

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“…The reaction is endothermic and inevitably controlled by the thermodynamic equilibrium, requiring substantial energy consumption. Supported chromium oxides have also been investigated for the oxidative dehydrogenation of lower alkanes [5][6][7][8][9][10][11] or oxidation of other organic compounds with oxygen [12,13]. However, the use of oxygen as an oxidant is frequently accompanied by deep oxidation, resulting in a decrease in product selectivity.…”

Section: Introductionmentioning

confidence: 99%

Behavior of active sites on Cr-MCM-41 catalysts during the dehydrogenation of propane with CO2

Takehira

Ohishi

Shishido

et al. 2004

Journal of Catalysis

200

160

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Section: Introductionmentioning

confidence: 99%

Behavior of active sites on Cr-MCM-41 catalysts during the dehydrogenation of propane with CO2

Takehira

Ohishi

Shishido

et al. 2004

Journal of Catalysis

200

160

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“…Indirect comparison of the activities of previously reported solid catalysts with the catalysts presented here in the oxidation of cyclohexanol in the presence of t BuOOH shows that the copper‐containing catalysts (this study) show lower activity than cobalt and copper nitrogen‐donor complexes (ethylenediamine or pyridine) immobilized on bentonite 43,45. On the other hand, the heterogeneous catalysts prepared show similar activity to supported cobalt oxide43 and [Cu(salen)] and [Cu(acac)] complexes immobilized on bentonite45 and higher activity than chromium silica‐supported catalysts ( C = 40 %),46 zirconium‐doped manganese oxide ( C = 13–18 %)47 and cobalt–salen‐type complexes immobilized on bentonite 43…”

Section: Resultsmentioning

confidence: 61%

Copper(II)–imida‐salen Complexes Encapsulated into NaY Zeolite for Oxidations Reactions

et al. 2013

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The oxidation of phenol, cychohexanol and hydroquinone has been screened in the presence of copper(II) complexes with the Schiff‐base salen ligand, 1,5‐bis[(E)‐5‐chloro‐2‐hydroxybenzylideneamino]‐1H‐imidazole‐4‐carbonitrile, and encapsulated into NaY zeolite by using two different methods. The new heterogeneous catalysts were characterized by SEM, XRD, FTIR, EPR and Raman spectroscopy as well as by chemical analysis. The structures of the copper(II) complexes were proposed on the basis of theoretical studies (DFT). The catalytic activities of the encapsulated copper(II) complexes in NaY were compared with their homogeneous counterparts. The results show higher or similar substrate conversion when compared with the free complex in all the reactions tested. After their use in catalytic reaction, these catalysts were found to be reusable without loss of activity.

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“…From these results, and to have a better insight of the process, new experiences were programmed to investigate the effect of different variables on the activity and selectivity of 5SG catalysts over the cyclohexanol oxidation in the presence of acetonitrile as solvent. This system is interesting to study since the little knowledge of this reaction performed in non-halogenated solvents [19].…”

Section: Oxidation Of Different Substratesmentioning

confidence: 99%

“…Between heterogeneous catalysts suitable for this reaction and obtained from supported transition metals [17,18], chromium is particularly attractive due to its wide variety of oxidation states. In fact, chromium/silica catalysts were probed for cycloalkane liquid phase oxidations [6,10,16,[18][19][20][21][22], where the activity was ascribed to the presence of the redox pair Cr 3+ /Cr 6+ [19]. Although Adam et al [10] and Sakthivel et al [6] have synthesized Cr/SiO 2 catalysts with very high catalytic activity, these authors also have reported the leaching of chromium species into the reaction mixture, becoming the reaction carried out partially into the homogeneous phase.…”

Section: Introductionmentioning

confidence: 99%

Amorphous Cr/SiO2 Materials Hydrothermally Treated: Liquid Phase Cyclohexanol Oxidation

et al. 2018

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Amorphous Cr-SiO 2 materials were synthesized by the sol-gel method and hydrothermally treated at temperatures between 150 and 220 °C. These materials were used as catalysts for cyclohexanol oxidation with H 2 O 2 as oxidant and CH 3 CN as a solvent. They were responsible for the decomposition of H 2 O 2 , which triggers, by a free radical mechanism in the homogeneous phase, the oxidation or degradation of the hydrocarbon chain. Metal leaching causes a drop in catalytic activity when the material is recycled. Studies on the hydrothermal treatment effect on the leaching process have demonstrated that the higher the hydrothermal treatment temperature, the higher the metal/support interaction, leading to a diminution of the leaching process. Under mild reaction conditions, and using TBHP as oxidant, leaching was reduced, and improvements were obtained on the selectivity towards the formation of cyclohexanone. The use of these catalysts in the oxidation of verbenol, an allylic alcohol, showed a significant increase in the substrate conversion and in the selectivity to carbonyl derivative formation.

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Untitled

Cited by 13 publications

References 4 publications

Behavior of active sites on Cr-MCM-41 catalysts during the dehydrogenation of propane with CO2

Behavior of active sites on Cr-MCM-41 catalysts during the dehydrogenation of propane with CO2

Copper(II)–imida‐salen Complexes Encapsulated into NaY Zeolite for Oxidations Reactions

Amorphous Cr/SiO2 Materials Hydrothermally Treated: Liquid Phase Cyclohexanol Oxidation

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