Title :

Unexpected kinetic behavior of structured Pd/CeO2–ZrO2 toward undesired ammonia formation and consumption during nitrites reduction: Role of the reactivity of oxygen from ceria

Author(s) :

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

Journal title :

Catalysis Today

Pages :

330-338

Publisher :

Elsevier BV

Publication date :

2022-01

ISSN :

0920-5861

HAL domain(s) :

Chimie/Catalyse

English abstract : [en]

This study deals with the kinetics of successive ammonia production and unexpected consumption in the course of the catalytic water denitrification over Pd/CexZr1-xO2 catalysts. A fast conversion of nitrites to ammonium ...
Show more >This study deals with the kinetics of successive ammonia production and unexpected consumption in the course of the catalytic water denitrification over Pd/CexZr1-xO2 catalysts. A fast conversion of nitrites to ammonium ions was found weakly dependent of the particle size of palladium likely due to the juxtaposition of electronic effects stabilizing electron-rich Pd active sites more prone to produce ammonia instead of nitrogen. Subsequent slow consumption of ammonia in anaerobic conditions occurred on Pd/CexZr1-xO2 whereas Pd/ZrO2 was found inactive for this sequential reaction. Kinetic measurements from semi batch experiments led to the estimation of rate constants. Particular attention was paid to ammonia oxidation reaction with a pseudo rate constant depending on the surface coverage of reactive oxygen from ceria then revealing the importance of the synthesis route of CexZr1-xO2 and peculiar interaction with Pd.Show less >

Language :

Anglais

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
CNRS
Centrale Lille
ENSCL
Univ. Artois

Collections :

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

Research team(s) :

Remédiation et matériaux catalytiques (REMCAT)

Submission date :

2024-04-05T11:57:23Z