Wide range temperature stability of palladium on ceria-praseodymia catalysts for complete methane oxidation

Ballauri, Sabrina; Sartoretti, Enrico; Novara, Chiara; Giorgis, Fabrizio; Piumetti, Marco; Fino, Debora; Russo, Nunzio; Bensaid, Samir

doi:10.1016/j.cattod.2021.11.035

Cited by 10 publications

(18 citation statements)

References 86 publications

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“…The results of the deconvolution, in terms of abundance of Ce 3+ and Pr 3+ ions, are reported in Table 2. The amount of reduced Ce ions decreased with the introduction of praseodymium and this finding is in line with previous investigations on materials with similar composition [15,16,43] . The amount of reduced Pr ions is rather similar for the three Pd/Ce90Pr10 samples.…”

Section: Resultssupporting

confidence: 91%

“…On the whole, in the low temperature range (100–500 °C) the palladium deposition on ceria and ceria‐praseodymia samples with high surface area leads to the preparation of materials with better activity compared to that obtained in previous studies concerning similar catalysts with lower SSA [15,16] . Furthermore, the role of praseodymium was confirmed by carrying out a second heating cycle up to 900 °C.…”

Section: Resultsmentioning

confidence: 63%

“…As expected, samples characterized by a higher surface area exhibited smaller crystallites. Some variations from this trend may be related to the presence of a partial agglomeration phenomenon [15,28] . The average crystallite size remained almost unchanged by moving from the supports to the Pd‐containing materials.…”

Section: Resultsmentioning

confidence: 93%

“…Although these materials have already been extensively studied, further efforts are needed to limit the loss of activity around 700–800 °C due to the PdO‐Pd transition and the detrimental effects of water [11–14] . In this context, the Pd deposition on Ce−Pr supports has been investigated over the past few years, obtaining materials with a higher catalytic activity with respect to Pd/CeO 2 , a better stability of the PdO species in the high temperature range, and an interesting behavior in the presence of water [15,16] . However, these materials were characterized by very low surface area values, while an increase in this parameter can be expected to considerably improve the catalytic performance of these catalysts [17,18] …”

Section: Introductionmentioning

confidence: 99%

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Mesoporous Ceria and Ceria‐Praseodymia as High Surface Area Supports for Pd‐based Catalysts with Enhanced Methane Oxidation Activity

Ballauri,

Sartoretti,

Castellino

et al. 2024

ChemCatChem

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In recent years, Pd/CeO2 materials have proven to be effective catalysts for the total oxidation of methane. In this work, three different synthesis routes were used to prepare high specific surface area supports, consisting of pure CeO2 and 10 at% Pr‐doped ceria (Ce90Pr10). Nano‐structured spheres were obtained with a microwave‐assisted synthesis, dumbbell‐like particles were produced through a urea‐based hydrothermal method, and ordered mesoporous oxides were prepared by using SBA‐15 as hard‐template. The six materials were then impregnated with 2 wt% Pd, calcined at 500 °C, and comprehensively characterized. All the samples retained their high surface area after impregnation (75–110 m2 g−1), allowing a good dispersion of palladium. No significant structural or morphological differences were observed upon Pr doping, but a higher Pd oxidation state was induced by Pr‐doped supports. However, all Pd/CeO2 and Pd/Ce90Pr10 catalysts exhibited similar activity for dry methane oxidation below 500 °C, regardless of the synthesis technique and of the Pr presence: they all achieved almost complete CH4 oxidation at 400 °C, showing a really remarkable improvement with respect to analogous low surface area supports. A promoting role of Pr was instead noticed in wet conditions, thanks to its ability to counteract water‐induced deactivation phenomena.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 63%

Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Mesoporous Ceria and Ceria‐Praseodymia as High Surface Area Supports for Pd‐based Catalysts with Enhanced Methane Oxidation Activity

Ballauri,

Sartoretti,

Castellino

et al. 2024

ChemCatChem

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“…The ceria-copper mixed oxides are characterized by analogous Raman spectra, although some differences are evident. The F 2g peak of doped ceria is broader and red-shifted to 448-451 cm −1 , evidencing structural distortion [60,61]. Moreover, the intensity of the defect band gradually increases upon copper addition and new defect-related components appear.…”

Section: Structural and Textural Propertiesmentioning

confidence: 95%

Cerium-Copper Oxides Synthesized in a Multi-Inlet Vortex Reactor as Effective Nanocatalysts for CO and Ethene Oxidation Reactions

et al. 2022

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In this study, a set of CuCeOx catalysts was prepared via the coprecipitation method using a Multi-Inlet Vortex Reactor: the Cu wt.% content is 5, 10, 20, 30 and 60. Moreover, pure CeO2 and CuO were synthesized for comparison purposes. The physico-chemical properties of this set of samples were investigated by complementary techniques, e.g., XRD, N2 physisorption at −196 °C, Scanning Electron Microscopy, XPS, FT-IR, Raman spectroscopy and H2-TPR. Then, the CuCeOx catalysts were tested for the CO and ethene oxidation reactions. As a whole, all the prepared samples presented good catalytic performances towards the CO oxidation reaction (1000 ppm CO, 10 vol.% O2/N2): the most promising catalyst was the 20%CuCeOx (complete CO conversion at 125 °C), which exhibited a long-term thermal stability. Similarly, the oxidative activity of the catalysts were evaluated using a gaseous mixture containing 500 ppm C2H4, 10 vol.% O2/N2. Accordingly, for the ethene oxidation reaction, the 20%CuCeOx catalyst evidenced the best catalytic properties. The elevated catalytic activity towards CO and ethene oxidation was mainly ascribed to synergistic interactions between CeO2 and CuO phases, as well as to the high amount of surface-chemisorbed oxygen species and structural defects.

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Selective catalytic reduction of NOx with NH3 over Ce-Mn oxide and Cu-SSZ-13 composite catalysts – Low temperature enhancement

Andana

Rappé

Nelson

et al. 2022

Applied Catalysis B: Environmental

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Wide range temperature stability of palladium on ceria-praseodymia catalysts for complete methane oxidation

Cited by 10 publications

References 86 publications

Mesoporous Ceria and Ceria‐Praseodymia as High Surface Area Supports for Pd‐based Catalysts with Enhanced Methane Oxidation Activity

Mesoporous Ceria and Ceria‐Praseodymia as High Surface Area Supports for Pd‐based Catalysts with Enhanced Methane Oxidation Activity

Cerium-Copper Oxides Synthesized in a Multi-Inlet Vortex Reactor as Effective Nanocatalysts for CO and Ethene Oxidation Reactions

Selective catalytic reduction of NOx with NH3 over Ce-Mn oxide and Cu-SSZ-13 composite catalysts – Low temperature enhancement

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