VOC oxidation over CuO–CeO2 catalysts prepared by a combustion method

Delimaris, Dimitrios; Ioannides, Theophilos

doi:10.1016/j.apcatb.2009.02.003

Cited by 279 publications

(126 citation statements)

References 59 publications

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“…The htpCCx catalysts have two to four reduction peaks below 500 uC, with the reductive peaks at around 100 and 170 uC attributed to the reduction of the well dispersed Cu species and Cu incorporated into the CeO 2 lattice, respectively. 66 The reduction peaks higher than 200 uC correspond to the contribution of crystalline CuO, 23 and signal peaks centered at reduction temperatures exceeding 300 uC are probably associated with the reduction of CeO 2 surface oxygen. The first reduction peak decreases from 159 to 95 uC with the increasing Cu loading of the htpCCx samples (Fig.…”

Section: Surface Composition and Reducibility Of The Synthesized Catamentioning

confidence: 99%

“…19,21,22 However, studies concerning the low-temperature catalytic combustion of HCVOCs using CuO-CeO 2 have seldom been reported, despite the material being proven to have excellent catalytic activities for the oxidation of many VOC pollutants. 23,24 At present, the primary issues for the oxidation of HCVOCs using transition metal oxides are how to improve the catalytic activity, reaction durability, and thermal stability. Different protocols have been reported for the synthesis of highly efficient transition metal oxide-loaded catalysts in previous studies, such as sol-gel, incipient impregnation, urea-nitrate combustion, coprecipitation, and one-pot polymeric precursors, however, the surface areas and total pore volumes of the obtained catalysts were rather low.…”

Section: Introductionmentioning

confidence: 99%

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Facile preparation of 3D ordered mesoporous CuOx–CeO2 with notably enhanced efficiency for the low temperature oxidation of heteroatom-containing volatile organic compounds

Chen

et al. 2013

RSC Adv.

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SBA-16 silica with intact surface hydroxyl groups was quickly obtained (5 min) via a fast-microwaveassisted method, and further adopted as an efficient template for the synthesis of three-dimensional (3D) ordered mesoporous CuO x -CeO 2 catalysts (htpCCx) through a simple and reproducible host-guest interaction. XRD, XPS, H 2 -TPR, and Raman results reveal that many of the Cu 2+ ions in htpCCx are incorporated into the CeO 2 lattice, leading to the formation of a Cu x Ce 12x O 22d solid solution, which produces a large number of oxygen vacancies and enhances the reducibility of the metal. The interaction of Cu and Ce is essential to the reaction as it maintains the Cu 2+ /Cu 1+ and Ce 4+ /Ce 3+ redox couples. The catalyst has a 3D mesostructure and possesses remarkably enhanced low-temperature activity for the combustion of epichlorohydrin. HtpCC20 has been identified as the most powerful catalyst for this reaction, with the reaction rate at 165 uC being about 6.3 and 33.3 times higher than those of catalysts synthesized using conventional incipient impregnation and thermal combustion methods, respectively. Furthermore, htpCC20 shows superior CO 2 selectivity (.99%) and stability (no deactivation occurs after 50 h reaction). It is believed that the dispersion of the active phase, density of surface active oxygen, and lowtemperature reducibility are the dominant factors governing the catalytic performance.

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Section: Surface Composition and Reducibility Of The Synthesized Catamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Facile preparation of 3D ordered mesoporous CuOx–CeO2 with notably enhanced efficiency for the low temperature oxidation of heteroatom-containing volatile organic compounds

Chen

et al. 2013

RSC Adv.

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“…For comparison, pure MnO 2 was prepared using the same procedure but without the addition of (NH 4 ) 2 Ce(NO 3 ) 6 . Pure CeO 2 was synthesized by adding 60 cm 3 of 2 M KOH aqueous solution to 200 cm 3 of 0.1 M (NH 4 ) 2 Ce(NO 3 ) 6 solution with a final pH value of 9.0 at 353 K. In both cases, the resultant solids were dried at 383 K for 12 h and calcined at 723 K for 6 h in air.…”

Section: Catalyst Preparationmentioning

confidence: 99%

“…It has long been motivated to utilize transition metal oxides for the catalytic combustion of light oxygenates like ethanol, acetaldehyde, and formaldehyde [5][6][7][8][9]. In particular, MnO x -CeO 2 oxides have been found to be highly active for the oxidation of light oxygenates, and the complete oxidation of ethanol to CO 2 was obtained at a temperature as low as 473 K [8,9].…”

Section: Introductionmentioning

confidence: 99%

Low-temperature oxidation of ethanol over a Mn0.6Ce0.4O2 mixed oxide

Tana

et al. 2011

Applied Catalysis B: Environmental

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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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VOC oxidation over CuO–CeO2 catalysts prepared by a combustion method

Cited by 279 publications

References 59 publications

Facile preparation of 3D ordered mesoporous CuOx–CeO2 with notably enhanced efficiency for the low temperature oxidation of heteroatom-containing volatile organic compounds

Facile preparation of 3D ordered mesoporous CuOx–CeO2 with notably enhanced efficiency for the low temperature oxidation of heteroatom-containing volatile organic compounds

Low-temperature oxidation of ethanol over a Mn0.6Ce0.4O2 mixed oxide

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

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