Mechanisms of NH3 generation using LNT (Lean NOx Trap)-like catalysts have been studied in a bench reactor over a wide range of temperatures, flow rates, reformer catalyst types and synthetic exhaust-gas compositions. The experiments showed that the on board production of sufficient quantities of ammonia on board for SCR (Selective Catalytic Reduction) operation appeared feasible, and the results identified the range of conditions for the efficient generation of ammonia. In addition, the effects of reformer catalysts using the water-gas-shift reaction as an in-situ source of the required hydrogen for the reactions are also illustrated. Computations of the NH3 and NOx kinetics have also been carried out and are presented. Design and impregnation of the SCR catalyst in proximity to the ammonia source is the next logical step. A heated synthetic-exhaust gas flow bench was used for the experiments under carefully controlled simulated exhaust compositions. Operating conditions include rich-lean cycles so that the transient production of NH3 and the reduction of NOx could be monitored. The bench offered significant flexibility and separate control over the wide ranges of temperatures, flow rates, and the compositions of the mixture. gas concentrations were measured by Fourier Transform Infrared (FT-IR) Spectroscopy.
Study of on-board ammonia (NH3) generation for SCR operation
Untersuchung der Onboard-Ammoniakerzeugung für den Betrieb der selektiven katalytischen Reduktion
2010
19 Seiten, 34 Bilder, 8 Tabellen, 17 Quellen
Aufsatz (Konferenz)
Englisch
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