Kinetic Modeling of NOx Storage/Reduction on Pt/BaO/Al2O3 Monolith Catalysts

Autor:	N. W. Currier, Fabio H. Ribeiro, A. Yezerets, Joshua L. Ratts, W. N. Delgass, James M. Caruthers, L. Cao
Rok vydání:	2008
Předmět:	geography Work (thermodynamics) geography.geographical_feature_category Chemistry General Chemical Engineering Kinetics Disproportionation General Chemistry Chemical reaction Industrial and Manufacturing Engineering Catalysis Adsorption Chemical engineering Monolith NOx
Zdroj:	Industrial & Engineering Chemistry Research. 47:9006-9017
ISSN:	1520-5045 0888-5885
DOI:	10.1021/ie8001809
Popis:	A balance of the complexity of the reactor model and the chemical reaction mechanism has to be made in order to predict the dynamic nature of NOx storage/reduction processes in real time. In this work, a one-dimensional, two-phase model is used to simulate the transient behavior of a monolithic Pt/BaO/Al2O3 catalyst for NOx storage/reduction. The following aspects of the process are discussed: (i) kinetics of NO and NO2 adsorption on BaO sites, (ii) effects of CO2 and H2O on NO/NO2 adsorption, and (iii) reduction of surface nitrates using H2. NOx adsorption with excess oxygen involves two kinetic routes, namely, NO2 disproportionation and direct NO adsorption, both of which form nitrates on the catalyst at 300 °C. A model with two time scales was found to be necessary to describe NO2 adsorption on the 20 wt % BaO catalyst. The model and parameters required to fit the NOx breakthrough curves suggest that CO2 and H2O in the feed reduce the number of sites for NO adsorption by changing the surface morphology...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::944631e79d51ecb9840e0a8caa94bb79 https://doi.org/10.1021/ie8001809 Zobrazit plný text záznamu