Influence of Na, P and (Na + P) poisoning on a model copper-ferrierite NH3-SCR catalyst - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Applied Catalysis B: Environmental Année : 2019

Influence of Na, P and (Na + P) poisoning on a model copper-ferrierite NH3-SCR catalyst

Résumé

To highlight the deactivation mechanisms encountered by minerals impurities from biodiesel, the effects caused by Na, P or (Na+P) additions were studied over a model Cu-FER catalyst. Na, P or (Na+P) were added by wet-impregnation in water in a wide concentration range up to 2 wt-%. The catalytic behaviors were evaluated by NH3/NO oxidation and standard/fast NH3-SCR reactions. In addition, a combination of several characterization techniques (ICP-AES, N2 adsorption/desorption, XRD, NH3-TPD, NO adsorption monitored by FTIR and H2-TPR) was applied to provide useful information regarding the deactivation mechanism caused by the minerals addition. Sodium and phosphorus interacted differently with the Cu-FER catalyst. Na addition induced a loss of Brønsted acid sites and a back-exchange of Cu 2+ with Na + , with formation of external CuO species, thus favoring the oxidation of NO and NH3. After phosphorus addition, the exchanged Cu 2+ species remained moderately affected, but direct interactions with copper were evidenced which were primarily responsible for catalyst deactivation toward the oxidation reactions. After equimolar addition of phosphorus and sodium, both Na and P effects were observed. For the NH3-SCR process, the ammonia adsorption ability, which depends on both acidity and copper units, appeared the main key parameter driving the catalytic activity at low temperature (T ≤ 250 °C). Phosphorus appeared to be the major responsible for catalyst deactivation after (Na+P) co-poisoning.

Domaines

Catalyse
Fichier principal
Vignette du fichier
Influence of Na, P and (Na + P) on copper-ferrierite NH3-SCR catalys pour HAL.pdf (1.33 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03108731 , version 1 (13-01-2021)

Identifiants

Citer

Marie-Laure Tarot, Eduard Emil Iojoiu, Vincent Lauga, Daniel Duprez, Xavier Courtois, et al.. Influence of Na, P and (Na + P) poisoning on a model copper-ferrierite NH3-SCR catalyst. Applied Catalysis B: Environmental, 2019, 250, pp.355-368. ⟨10.1016/j.apcatb.2019.03.044⟩. ⟨hal-03108731⟩
19 Consultations
107 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More