Title :

Support-induced effect on the catalytic properties of Pd particles in water denitrification: Impact of surface and structural features of mesoporous ceria-zirconia support

Author(s) :

Granger, Pascal [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Troncéa, S. [Auteur]
University of Bucharest [UniBuc]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Dacquin, Jean-Philippe [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Trentesaux, Martine [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Parvulescu, Vasile I. [Auteur]
University of Bucharest [UniBuc]

Journal title :

Applied Catalysis B: Environmental

Volume number :

224

Pages :

648-659

Publisher :

Elsevier

Publication date :

2018-05

English keyword(s) :

Palladium
Mesoporous materials
Ce0.5Zr0.5O2 mixed oxides
Catalytic nitrite reduction
Drinking water

HAL domain(s) :

Chimie/Catalyse

English abstract : [en]

The support effect on the catalytic properties of palladium particles has been investigated in the reduction of nitrites by hydrogen at 20 °C in batch conditions. The support material was composed of ceria-zirconia mixed ...
Show more >The support effect on the catalytic properties of palladium particles has been investigated in the reduction of nitrites by hydrogen at 20 °C in batch conditions. The support material was composed of ceria-zirconia mixed oxide stabilized in the tetragonal structure according to an Evaporation Induced Self-Assembly method. In comparison, a co-precipitation method leads to inhomogeneity in composition related to the partial segregation of the cubic fluorite structure of CeO2. Further textural properties obtained for the two synthesis routes differ as well as changes in the reducibility. Surface analysis demonstrated a more extensive surface reduction of Ce4+ to Ce3+ on the series prepared by coprecipitation correlated to a greater stabilization of metallic Pd particles. However, the best catalytic performances were obtained on low loaded Pd samples supported on the ceria-zirconia support prepared by the Evaporation Induced Self-Assembly method which emphasizes the fact that catalytic properties cannot be simply explained by the stabilization of zero valent precious metal at the vicinity of anionic vacancies. Further calculations of TOF and interfacial rates were achieved and compared to the selectivity behavior suggesting that the localization of Pd in contact with the tetragonal or cubic structure of the solid solution and CeO2 could play a key role in determining the catalytic properties.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

ENSCL
CNRS
Centrale Lille
Univ. Artois
Université de Lille

Collections :

• Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Research team(s) :

Matériaux pour la catalyse (MATCAT)
Remédiation et matériaux catalytiques (REMCAT)

Submission date :

2019-09-25T14:37:52Z
2021-03-17T16:26:42Z