A Kinetic Model of the Hydrogen Assisted Selective Catalytic Reduction of NO with Ammonia over Ag/Al2O3

作者：Tamm Stefanie; Olsson Louise^*; Fogel Sebastian; Gabrielsson Par; Skoglundh Magnus

来源：AICHE Journal, 2013, 59(11): 4325-4333.

DOI：10.1002/aic.14170

• NH3-SCR
• NOx reduction
• H-2
• global kinetic model
• Ag/Al2O3

A global kinetic model which describes H-2-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 H-2 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 H-2 of 1:1:2. Further reactions included in the model are the oxidation of NH3 to N-2 and NO, oxidation of H-2, 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 H-2-assisted NH3-SCR steady-state experiments. The model predicts the conversion of NOx well even during transient experiments.

• 出版日期2013-11