Estimation of Effective diffusivity of stored NOx in the barium phase of Pt / BaO / Al2O3 catalysts using TAP / Ashok Kumar in Industrial & engineering chemistry research, Vol. 49 N° 21 (Novembre 2010)  

Estimation of Effective diffusivity of stored NOx in the barium phase of Pt / BaO / Al2O3 catalysts using TAP [texte imprimé] / Ashok Kumar, Auteur ; Michael P. Harold, Auteur ; Vemuri Balakotaiah, Auteur . - 2011 . - pp. 10334-10340.
Chimie industrielle
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 49 N° 21 (Novembre 2010) . - pp. 10334-10340

Mots-clés :	Catalyst Diffusion coefficient
Résumé :	A systematic study over Pt/BaO/Al2O3 powder catalyst is carried out using Temporal Analysis of Products (TAP) to estimate the effective diffusivity of stored NO, in the barium phase. The prenitration of PtBaO/ Al2O3 using sequential pulses of NO, followed by reduction with H2 results in the evolution of N2 and NH3. The reduction is carried out in the NOx transport limited regime in which diffusion of the stored NO, from BaO storage phase to Pt/BaO interface was determined to be the rate controlling process. The effluent profiles of N containing species (2N2 + NH3) were used to estimate stored NO, diffusivity in barium phase and the apparent activation energy. The activation energy (74-81 kJ/mol) is in good agreement with the estimated value of 75 kJ/mol from a recent NO, trap modeling study.1.
ISSN :	0888-5885
En ligne :	http://cat.inist.fr/?aModele=afficheN&cpsidt=23447924