Complete n-hexane oxidation over supported Mn–Co catalysts

Todorova, S.; Kolev, Hristo; Holgado, Juan P.; Kadinov, G.; Bonev, Ch.; Pereñíguez, Rosa; Caballero, A.

doi:10.1016/j.apcatb.2009.10.019

Cited by 148 publications

(74 citation statements)

References 29 publications

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“…Table 2 also gives the Co/Ce ratio at the catalyst surfaces and the highest ratio can be observed for Co 20 /γ-Al 2 O 3 -CeO 2 , indicating cobalt enrichment at the surface in the case of this sample. On the other hand, a decrease in the Co/Ce ratio at the surface can be attributed to the partial coating of the cobalt oxide by cerium oxide (Todorova et al, 2010). Table 3 reports the results obtained from oxygen chemisorption measurements.…”

Section: Characterization Of the Catalystsmentioning

confidence: 89%

“…With an increase in the cobalt loading, a higher number of active sites are available Brazilian Journal of Chemical Engineering for the oxidation reactions, which resulted in higher conversion levels. As shown in Table 2, the lower Co/Ce ratio of the Co 10 /γ-Al 2 O 3 -CeO 2 catalyst can be explained by the partial coating of the cobalt oxide by cerium oxide, which can block some of the active cobalt sites reflecting in a lower activity (Todorova et al, 2010). In addition, Kang et al (2003), studying cobalt supported on ceria catalysts in the CO oxidation reaction, concluded that ceria supplies oxygen to cobalt, leading to the retention of its higher valence state with increasing cobalt loading.…”

Section: Catalytic Activity Testsmentioning

confidence: 99%

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Catalytic oxidation of volatile organic compounds (n-hexane, benzene, toluene, o-xylene) promoted by cobalt catalysts supported on γ-Al2O3-CeO2

Balzer

Probst

Drago

et al. 2014

Braz. J. Chem. Eng.

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-Cobalt catalysts supported on γ-alumina, ceria and γ-alumina-ceria, with 10 or 20%wt of cobalt load, prepared by the wet impregnation method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), field emission transmission electron microscopy (FETEM), N 2 adsorptiondesorption isotherms (BET/BJH methods), energy-dispersive X-ray spectroscopy (EDX), X-ray photoemission spectroscopy (XPS), O 2 -chemisorption and temperature programmed reduction (TPR) were used to promote the oxidation of volatile organic compounds (n-hexane, benzene, toluene and o-xylene). For a range of low temperatures (50-350 °C), the activity of the catalysts with a higher cobalt load (20% wt) was greater than that of the catalysts with a lower cobalt load (10% wt). The Co/γ-Al 2 O 3 -CeO 2 catalytic systems presented the best performances. The results obtained in the characterization suggest that the higher catalytic activity of the Co 20 /γ-Al 2 O 3 -CeO 2 catalyst may be attributed to the higher metal content and amount of oxygen vacancies, as well as the effects of the interaction between the cobalt and the alumina and cerium oxides.

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Section: Characterization Of the Catalystsmentioning

confidence: 89%

Section: Catalytic Activity Testsmentioning

confidence: 99%

Catalytic oxidation of volatile organic compounds (n-hexane, benzene, toluene, o-xylene) promoted by cobalt catalysts supported on γ-Al2O3-CeO2

Balzer

Probst

Drago

et al. 2014

Braz. J. Chem. Eng.

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“…The surface composition of TiZrCo was studied by XPS. As shown in Figure 5, the Ti and Zr existed on the surface with oxidation states of TiO 2 and ZrO 2 , and Co mainly existed on the surface with metallic Co, oxides of CoO and Co 3 O 4 , as confirmed by the peak at the binding energy of 777.6 eV and intense shake-up satellites Co 2p XPS spectra around 6 eV above the primary spin-orbit Bes [29][30][31]; Co 3 O 4 was confirmed by Co 3+ /Co 2+ (2/1) [32]. The surface compositions calculated according to the results of XPS ( Figure 5) are listed in Table 3.…”

Section: Resultsmentioning

confidence: 85%

Aerobic Catalytic Oxidation of Cyclohexene over TiZrCo Catalysts

et al. 2016

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Abstract:The aerobic oxidation of hydrocarbon is of great significance from the viewpoints of both fundamental and industry studies as it can transfer the petrochemical feedstock into valuable chemicals. In this work, we investigated the aerobic oxidation of cyclohexene over TiZrCo catalysts, in which 2-cyclohexen-1-one was produced with a high selectivity of 57.6% at a conversion of 92.2%, which are comparable to the best results reported for the aerobic oxidation of cyclohexene over heterogeneous catalysts. The influences of kinds of solvent, substrate concentration and reaction temperature were evaluated. Moreover, the catalytic performance of the TiZrCo catalyst and the main catalytic active species were also discussed. The results of SEM, XRD and XPS suggested that the surface CoO and Co 3 O 4 species are the catalytic active species and contribute to the high activity and selectivity in the present cyclohexene oxidation. The present catalytic system should have wide applications in the aerobic oxidation of hydrocarbons.

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“…nHexane [10,13,46] and iso-Octane [47][48][49][50]. However, most of the studies in case of isoOctane have been reported on its partial oxidation [47][48][49][50].…”

Section: Activity Of Catalysts For N-hexane Oxidationmentioning

confidence: 99%