Particle size and support effects on the complete benzene oxidation by Co and Co–Pt catalysts

Todorova, S.; Kadinov, G.; Tenchev, K.; Kalvachev, Yuri; Kostov‐Kytin, Vladislav

doi:10.1007/s10853-006-0894-x

Cited by 14 publications

(15 citation statements)

References 20 publications

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“…The increase in the catalytic activity of Co 3 O 4 -CeO 2 composite oxides the authors in [10][11][12][13][14][15] explain with great decrease in the crystal size of Co 3 O 4 . In our previous investigations [16,17] we found that finely dispersed supported Co 3 O 4 /SiO 2 catalysts have better performance in complete oxidation of n-hexane. Following these results we decided to study the influence of the sequence of active Co 3 O 4 and CeO 2 introduction on the support on the catalytic activity in n-hexane and CO oxidation.…”

Section: Introductionmentioning

confidence: 86%

Co3O4 + CeO2/SiO2 Catalysts for n-Hexane and CO Oxidation

et al. 2008

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Two-component Co-Ce samples deposited onto SiO 2 have been prepared, characterized and tested in the reaction of complete n-hexane and CO oxidation. It was established that cerium enhanced the catalytic activity of cobalt in the reaction of n-hexane oxidation, although this depended on the sequence of cobalt and cerium introduction. Co-impregnation of Co and Ce resulted in a close interaction between Co 3 O 4 and CeO 2 leading to more surface oxygen species available and, therefore, a better reactivity.

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Section: Introductionmentioning

confidence: 86%

Co3O4 + CeO2/SiO2 Catalysts for n-Hexane and CO Oxidation

et al. 2008

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“…The intense and broad peak at 798°C is assigned to reduction of MgCo 2 O 4 to metallic Co [24]. The shoulder at low temperature (195°C), might be associated with the reduction of oxygen chemisorbed on cobalt, as reported for cobalt supported on ZrO 2 [28,29], or exchanged in ZSM-5 [30].…”

Section: Co/mgomentioning

confidence: 61%

“…The comparison of profiles a and b (Fig. 2) allows to attribute the peaks at 322, 394, 463°C to the reduction of Co 3 O 4 particles with different particle sizes to metallic cobalt [21,24,27,28]. The intense and broad peak at 798°C is assigned to reduction of MgCo 2 O 4 to metallic Co [24].…”

Section: Co/mgomentioning

confidence: 99%

“…4 (profile a, c) H 2 -TPR profile of Co 3 O 4 (red) after ethanol steam reforming at 550°C and the reference TPR profile of Co 3 O 4 (ox) are reported. Co 3 O 4 (red) shows a weak peak at 550°C assigned to reduction of CoO clusters to Co 0 [21,27,28], with e/Co = 0.014, corresponding to about 1% of analytical cobalt. The weak peak at 212°C, according to other authors [28,29], is assigned to the reduction of trace of chemisorbed oxygen.…”

Section: Tpr Characterization After Catalysismentioning

confidence: 99%

“…Co 3 O 4 (red) shows a weak peak at 550°C assigned to reduction of CoO clusters to Co 0 [21,27,28], with e/Co = 0.014, corresponding to about 1% of analytical cobalt. The weak peak at 212°C, according to other authors [28,29], is assigned to the reduction of trace of chemisorbed oxygen. Similarly, TPR profile of Co/MgO(600)(red) after ethanol steam reforming (not reported), shows a main peak at 515°C assigned to CoO clusters reduction, with e/Co = 0.034 corresponding to about 2% of analytical cobalt.…”

Section: Tpr Characterization After Catalysismentioning

confidence: 99%

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On the Catalytic Activity of Cobalt Oxide for the Steam Reforming of Ethanol

Tuti¹,

Pepe²

2007

Catal Lett

103

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The paper presents an investigation on the catalytic activity for the ethanol steam reforming of Co 3 O 4 oxidized, reduced and supported on MgO, and of CoO in MgO solid solution. Only samples containing metallic cobalt are found to be active for reforming reaction. H 2 -TPR characterization of aged samples shows that reaction mixture oxidizes a small fraction of metallic cobalt to Co +2 . A distinct role of Co +2 and Co 0 in the reaction is enlightened.

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