Fabrication of praseodymium-doped ceria (PDC) films by slurry spin-coating technique and its structural, morphological and optical properties

Ravindra, M.; Shirasangi, Rahulkumar; Dasari, Hari Prasad; Saidutta, M. B.

doi:10.1016/j.apsadv.2023.100413

Cited by 1 publication

(1 citation statement)

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“…The presence of the (111), (200), (220), (311), ( 222), (400), (331) and (420) peaks proves the presence of the typical cubic fluorite structure of CeO 2 catalysts. [22][23][24] Moreover, considering that no peak splitting was observed within the patterns reported in Figure S3 and Figure 1, a solid solution between ceria and praseodymia was formed in the Ce90Pr10 samples. [25] This result was expected, considering the very close ionic radii of Ce 4 + /Ce 3 + and Pr 4 + /Pr 3 + ions (Ce 4 + = 0.97 Å, Ce 3 + = 1.143 Å, Pr 4 + = 0.96 Å, Pr 3 + = 1.126 Å).…”

Section: Characterization Of the Powdered Catalystsmentioning

confidence: 71%

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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