Design of nano-sized FeOx and Au/FeOx catalysts supported on CeO2 for total oxidation of VOC

Bonelli, Rosa; Albonetti, Stefania; Morandi, Vittorio; Ortolani, Luca; Riccobene, Paolo Maria; Scirè, Salvatore; Zacchini, Stefano

doi:10.1016/j.apcata.2011.01.017

Cited by 60 publications

(23 citation statements)

References 50 publications

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“…These results are in agreement with the literature, which reports that toluene total oxidation requires higher temperatures than alcohols [16,17,19,[84][85][86][87]. Previous studies concluded that the reactivity of VOCs for the total oxidation reaction depends on their functional groups.…”

Section: Total Oxidation Of Toluenesupporting

confidence: 83%

Platinum supported on highly-dispersed ceria on activated carbon for the total oxidation of VOCs

Abdelouahab-Reddam

Mail

Coloma

et al. 2015

Applied Catalysis A: General

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*Graphical Abstract (for review) Highlights-Pt-CeO 2 catalysts supported on activated carbon are active in the total oxidation of VOCs.-These catalysts have shown higher activity than platinum supported on bulk ceria.-The best catalyst contained only 10wt% ceria.-Pt-10Ce/C catalyst showed a high stability under both dry and humid conditions. AbstractCatalysts consisting in platinum supported on cerium oxide highly dispersed on wt.% ceria loading, likely due to an optimum synergistic interaction between highly dispersed cerium oxide and platinum particles. Pt-10Ce/C achieves total conversion of ethanol and toluene to CO 2 at 433 K and 453 K, respectively, and shows no deactivation during a test for 100 h. Under humid conditions (relative humidity, RH, of 40 and 80 %), the activity was only slightly influenced due to the hydrophobic character of the activated carbon support, which prevents the adsorption of water.

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Section: Total Oxidation Of Toluenesupporting

confidence: 83%

Platinum supported on highly-dispersed ceria on activated carbon for the total oxidation of VOCs

Abdelouahab-Reddam

Mail

Coloma

et al. 2015

Applied Catalysis A: General

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“…The oxygen capability is enhanced when iron is added as dopant to ceria [42,43]. However, Bonelli et al [44] have observed that, in contrast to the strong positive effect on methanol combustion, in the case of toluene combustion, the addition of FeO x /Au species caused a significant decrease in the activity of bare CeO 2 . The present results on gold catalysts on Fe-, Mn-(especially AuCeMnCP with the highest possibility for oxygen supply according to the TPR results) and Snmodified ceria should be explained by the supposition that the key step for the reaction of CBO is not the activation of oxygen but the activation of benzene.…”

Section: Discussionmentioning

confidence: 93%

Gold catalysts on ceria doped with MeOx (Me = Fe, Mn, Co and Sn) for complete benzene oxidation: effect of composition and structure of the mixed supports

Ilieva

Petrova

Tabakova

et al. 2011

Reac Kinet Mech Cat

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Gold catalysts supported on ceria doped with different metal oxides (Fe, Mn, Co and Sn) were synthesized using two techniques: CP and mechanochemical activation. The catalytic activity in complete benzene oxidation (CBO) was studied. The samples were characterized by means of XRD and high resolution transmission electron microscopy, and non-significant differences in the average size and the distribution of gold particles were observed. This means that the main reason for the different catalytic behavior in CBO has to be searched in the composition and structure of the supports. In spite of the higher hydrogen consumption (e.g., higher oxygen mobility) estimated by means of TPR, the gold catalysts on ceria doped with transition metal oxides generally are less active than gold/ceria catalyst. This observation could be explained taking into consideration that the key factor for the high oxidation activity is not the oxygen supplying but the activation of the very stable benzene molecule. The higher catalytic activity in comparison with that of the gold/ceria catalyst was observed only using a mixed ceria-CoO x support mechanochemically prepared. Very high and stable catalytic activity in CBO was obtained over this sample.

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“…EDX analysis [23] was performed to determine the chemical composition of the prepared catalysts. A typical result is presented in Fig.…”

Section: Effect Of Catalyst Metal Loading and Calcination Temperaturementioning

confidence: 99%

“…Supported metal catalysts for the oxidation process consist of three parts including the support, the active metal, and the promoter. Various materials such as activated carbons [18][19][20], alumina [21,22], metal oxides [23][24][25], zeolites [26] and silica [27] have been used as catalyst support for removal of VOCs by catalytic oxidation. Activated carbons have several advantages that include; (1) hydrophobicity, (2) high surface area, (3) flexible surface, and (4) low cost [19,28].…”

Section: Introductionmentioning

confidence: 99%

Preparation, characterization and kinetic behavior of supported copper oxide catalysts on almond shell-based activated carbon for oxidation of toluene in air

et al. 2014

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Dispersed copper oxide nano-catalysts supported on almond shell-based activated carbon were prepared for catalytic oxidation of toluene in air. The response surface methodology was used to express the catalyst removal efficiency in terms of catalyst metal loading and calcination temperature. Catalyst activity increased with both increasing calcination temperature and metal loading. Calcination temperature had a significant effect on the catalyst activity only at high metal loadings. Two different catalyst preparation methods were employed to investigate the effect of impregnation technique on the deposition-precipitation method. Well-dispersed nano catalysts with higher efficiency towards oxidation of toluene were prepared by the heterogeneous depositionprecipitation (HDP) as compared with the combined impregnation and deposition-precipitation method. The support and catalyst properties were determined by X-ray diffraction, Transmission electron microscopy, fieldemission scanning electron microscope, Boehm test, Brunauer-Emmett-Teller surface area measurements, and energy-dispersive X-ray spectroscopy. Characterization analyses and reaction experiments indicated the antonym effect of impregnation method on the deposition-precipitation method for catalyst preparation. Two types of crystallite (large and small) were formed on the support as a consequence of using the combined catalyst preparation method. Kinetic models were proposed for oxidation of toluene using copper oxide catalysts prepared by the HDP method. The kinetic study indicated that an Eley-Rideal mechanism could adequately describe the kinetic behavior of toluene oxidation.List of symbols C 0 Inlet feed concentration (ppm) C e Exit gas concentration (ppm) D Mean crystallite diameter (nm) K Dimensionless shape factor = 0.9 k X-ray wavelength BLine broadening at half maximum intensity H Bragg angle X T Steady state conversion of the toluene W Weight of catalyst loaded in reactor (g) M Inlet molar flow rate of toluene (mol/s) r Rate of toluene oxidation (mol/g s) Error Objective function of GA methodology for estimating kinetic constants was the absolute error E Activation energy (kJ/mol) DH Adsorption enthalpy (kJ/mol) R Gas constant (J/mol K) R 2

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Design of nano-sized FeOx and Au/FeOx catalysts supported on CeO2 for total oxidation of VOC

Cited by 60 publications

References 50 publications

Platinum supported on highly-dispersed ceria on activated carbon for the total oxidation of VOCs

Platinum supported on highly-dispersed ceria on activated carbon for the total oxidation of VOCs

Gold catalysts on ceria doped with MeOx (Me = Fe, Mn, Co and Sn) for complete benzene oxidation: effect of composition and structure of the mixed supports

Preparation, characterization and kinetic behavior of supported copper oxide catalysts on almond shell-based activated carbon for oxidation of toluene in air

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