Details

Autor(en) / Beteiligte

• Wu, J.
• Glisenti, A.
• Dacquin, J.P.
• Dujardin, C.
• Fernández Acevedo, C.
• Salazar Castro, C.
• Granger, P.

Titel

CexZr1−xO2 mixed oxide as OSC materials for supported Pd three-way catalysts: Flame-spray-pyrolysis vs. co-precipitation

Ist Teil von

• Applied catalysis. A, General, 2020-05, Vol.598, p.117527, Article 117527

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2020

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• [Display omitted] •CexZr1−xO2 prepared by flame-spray-pyrolysis outperforms co-precipitated counterparts due to higher surface area and defective sites.•Better Pd dispersion on impregnated CexZr1−xO2 compared to Pd-doped samples obtained from a one pot flame-spray-pyrolysis method.•High catalytic properties at low temperature for propene and CO oxidation due to the creation of dual sites at the Pd–Ce interface. The three-way catalytic performances of Pd-doped CexZr1−xO2 mixed oxides prepared according to a one pot flame-spray-pyrolysis method and through a two steps preparation where Pd was subsequently impregnated on a commercial CexZr1−xO2 prepared by co-precipitation CZ(COP) were compared. flame-spray-pyrolysis led to bare CexZr1−xO2 CZ(FSP) having higher specific surface area and greater extent of defective sites compared to the co-precipitated sample. Pd incorporation led to drastic gain in activity likely related to the creation of dual sites combining metallic Pd atoms at the vicinity of labile oxygen species from the ceria-zirconia support. However, this peculiar kinetic behavior manifests more extensively on the impregnated Pd/CZ(COP) due to a higher density of metallic Pd sites and a stronger metal-support interaction which weakens the Ce-O bond. Such conclusion agrees with O2-TPD experiments revealing a higher surface oxygen mobility on Pd/CZ(COP) corresponding to higher reactivity of oxygen from the support.