Ceria supported group IB metal catalysts for the combustion of volatile organic compounds and the preferential oxidation of CO

Scirè, Salvatore; Riccobene, Paolo Maria; Crisafulli, C.

doi:10.1016/j.apcatb.2010.09.013

Cited by 118 publications

(56 citation statements)

References 52 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%

“…The beneficial effect due to the addition of a noble metal to the ceria-based catalysts has been demonstrated in the literature [21,22]. Thus, noble metals improve the reducibility of ceria through the establishment of a metaloxide interaction, which weakens the Ce−O bonds located at the interface Pt−CeO 2 and, consequently, increases the mobility of lattice oxygen involved in VOCs oxidation through a Mars-van Krevelen reaction mechanism [16]. On the other hand, the efficiency of ceria-based catalysts in the total oxidation of VOCs can be improved by using an appropriate support as activated carbon.…”

Section: Introductionmentioning

confidence: 94%

“…[9][10][11][12][13][14]. Among the catalysts based on metal oxides which are studied in the literature, cerium oxide is considered to be particularly suitable for total oxidation of VOCs, either pure or in combination with noble metals or other metal oxides [15][16][17][18][19]. The high activity of ceria in total oxidation reactions is ascribed to its high oxygen storage capacity (OSC) and its exceptional redox properties [20].…”

Section: Introductionmentioning

confidence: 99%

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

Abdelouahab-Reddam

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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%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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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 size of the crystalline grains of investigated catalysts, calculated by the Scherrer equation referring to the main peak of cerium oxide at 2θ = 28.6 • (1 1 1), their BET surface area and mean pore diameters, calculated with the Dollimore-Heal method [42], are reported in Table 1. The precipitation method with KOH used to synthesize the bare CeO 2 leads to a catalyst with relatively high surface area (107 m 2 /g) and small pores (3 nm) in line with literature data [43,44]. A small increase (around 10%) of surface area (119 m 2 /g) was noticed in the presence of manganese oxide, consistent with the decrease of the crystallite size (from 10 nm of the bare CeO 2 to 8.5 nm of the mixed CeO 2 -MnO X oxide) and the pore diameter.…”

Section: Structural and Textural Propertiesmentioning

confidence: 60%

Ru–Pd Bimetallic Catalysts Supported on CeO2-MnOX Oxides as Efficient Systems for H2 Purification through CO Preferential Oxidation

et al. 2018

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Abstract:The catalytic performances of Ru/ceria-based catalysts in the CO preferential oxidation (CO-PROX) reaction are discussed here. Specifically, the effect of the addition of different oxides to Ru/CeO 2 has been assessed. The Ru/CeO 2 -MnO x system showed the best performance in the 80-120 • C temperature range, advantageous for polymer-electrolyte membrane fuel cell (PEMFC) applications. Furthermore, the influence of the addition of different metals to this mixed oxide system has been evaluated. The bimetallic Ru-Pd/CeO 2 -MnO x catalyst exhibited the highest yield to CO 2 (75%) at 120 • C whereas the monometallic Ru/CeO 2 -MnO x sample was that one with the highest CO 2 yield (60%) at 100 • C. The characterization data (H 2 -temperature programmed reduction (H 2 -TPR), X-ray diffraction (XRD), N 2 adsorption-desorption, diffuse reflectance infrared Fourier transform spectroscopy (DRIFT), X-ray photoelectron spectroscopy (XPS)) pointed out that the co-presence of manganese oxide and ruthenium enhances the mobility/reactivity of surface ceria oxygens accounting for the good CO-PROX performance of this system. Reducible oxides as CeO 2 and MnO x , in fact, play two important functions, namely weakening the CO adsorption on the metal active sites and providing additional sites for adsorption/activation of O 2 , thus changing the mechanism from competitive Langmuir-Hinshelwood into non-competitive one-step dual site Langmuir-Hinshelwood/Mars-van Krevelen. As confirmed by H 2 -TPR and XPS measurements, these features are boosted by the simultaneous presence of ruthenium and palladium. The strong reciprocal interaction of these metals between them and with the CeO 2 -MnO x support was assumed to be responsible of the promoted reducibility/reactivity of CeO 2 oxygens, thus resulting in the best CO-PROX efficiency at low temperature of the Ru-Pd/CeO 2 -MnO x catalyst. The higher selectivity to CO 2 found on the Ru-Pd system, which reduces the undesired H 2 consumption, represents a promising result of this research, being one of the key aims of the design of CO-PROX catalysts.

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“…In general, the catalysts typically used for this application are supported noble metals (Pt, Pd, Rh, Au, etc.,) and metal oxides (CeO 2 , CuO, MnO x , CoO x , etc.,) [5][6][7][8][9][10]. Particularly, ceria has been demonstrated to be a promising catalyst in the total oxidation of VOCs, either pure or in combination with noble metals or other metal oxides [11][12][13][14][15]. The high activity of ceria in oxidation reactions is attributed to its high oxygen storage capacity (OSC) and its exceptional redox properties [16].…”

Section: Introductionmentioning

confidence: 99%

Effect of the metal precursor on the properties of Pt/CeO2/C catalysts for the total oxidation of ethanol

et al. 2015

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. Toluene hydrogenation has been used to obtain an estimation of the platinum dispersion on the investigated catalysts. On the other hand, their catalytic behavior has been evaluated in the total oxidation of ethanol, selected as a VOCs probe molecule. A much higher catalytic activity and selectivity to CO2 was achieved with chlorinated catalysts. This behavior has been correlated with a high platinum dispersion and a strong metal-CeO2 interaction in these catalysts which promotes their redox properties. This is a previous version of the article published in Catalysis Today. 2015Today. , 249: 109-116. doi:10.1016Today. /j.cattod.2014 Highlights -Highly efficient catalysts for the complete oxidation of ethanol have been developed.-The use of CeO 2 as promoter is optimized by dispersing it over the activated carbon surface.-Impact of the platinum precursor (chlorinated or Cl-free) on the catalytic activity.-Pt/CeO 2 /C catalysts are more active than Pt/CeO 2 . K, ICP, XRD, H 2 -TPR and XPS). Toluene hydrogenation has been used to obtain an estimation of the platinum dispersion on the investigated catalysts. On the other hand, their catalytic behavior has been evaluated in the total oxidation of ethanol, selected as a VOCs probe molecule. A much higher catalytic activity and selectivity to CO 2 was achieved with chlorinated catalysts. This behavior has been correlated with a high platinum dispersion and a strong metal-CeO 2 interaction in these catalysts which promotes their redox properties.

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Ceria supported group IB metal catalysts for the combustion of volatile organic compounds and the preferential oxidation of CO

Cited by 118 publications

References 52 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

Ru–Pd Bimetallic Catalysts Supported on CeO2-MnOX Oxides as Efficient Systems for H2 Purification through CO Preferential Oxidation

Effect of the metal precursor on the properties of Pt/CeO2/C catalysts for the total oxidation of ethanol

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