A kinetic model of the hydrogen assisted selective catalytic reduction of NO with ammonia over Ag/Al2O3
Journal article, 2013

A global kinetic model which describes H2-assisted NH3-SCR over an Ag/Al2O3 monolith catalyst has been developed. The intention is that the model can be applied for dosing NH3 and H2 to an Ag/Al2O3 catalyst in a real automotive application as well as contribute to an increased understanding of the reaction mechanism for NH3-SCR. Therefore, the model needs to be simple and accurately predict the conversion of NOx. The reduction of NO is described by a global reaction, with a molar stoichiometry between NO, NH3 and H2 of 1:1:2. Further reactions included in the model are the oxidation of NH3 to N2 and NO, oxidation of H2, and the adsorption and desorption of NH3. The model was fitted to the results of an NH3-TPD experiment, an NH3 oxidation experiment, and a series of H2-assisted NH3-SCR steady-state experiments. The model predicts the conversion of NOx well even during transient experiments.

NH3-SCR

H2

Ag/Al2O3

NOx reduction

global kinetic model

Author

Stefanie Tamm

Competence Centre for Catalysis (KCK)

Chalmers, Chemical and Biological Engineering, Chemical Reaction Engineering

Louise Olsson

Chalmers, Chemical and Biological Engineering, Chemical Reaction Engineering

Competence Centre for Catalysis (KCK)

Sebastian Fogel

Technical University of Denmark (DTU)

Haldor Topsoe

Pär Gabrielsson

Haldor Topsoe

Magnus Skoglundh

Competence Centre for Catalysis (KCK)

Chalmers, Chemical and Biological Engineering, Applied Surface Chemistry

AICHE Journal

0001-1541 (ISSN) 1547-5905 (eISSN)

Vol. 59 11 4325-4333

Driving Forces

Sustainable development

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Transport

Energy

Materials Science

Subject Categories

Physical Chemistry

Chemical Process Engineering

Roots

Basic sciences

DOI

10.1002/aic.14170

More information

Latest update

3/27/2018