Chapter 5: Mechanism and Kinetics of NOx Storage
Book chapter, 2018

In this chapter, experimental studies and kinetic models are presented to elucidate the fundamental mechanisms for NOxstorage on the NOxstorage and reduction (NSR) catalysts. A well-accepted reaction pathway for NOxstorage includes, as an initial step, the oxidation of NO to NO2under lean conditions, and subsequently storage on the NOxstorage sites in the form of nitrites or nitrates. NO can also be stored directly in the presence of NO and oxygen, in the so-called nitrite route. However, the NOxstorage process is largely influenced by the primary gas components in the exhaust stream, such as CO2, H2O and SO2. In particular, significant attention has been focused on sulphur poisoning and the interaction of SO2with different NSR components due to its large potential of harming NSR catalyst activity. Finally, a kinetic model describing in detail the sulphur poisoning over a commercial LNT catalyst is discussed. The model can well describe the gradual deactivation of the catalyst during sulphur exposure.

Author

Jesus De Abreu Goes

Volvo Cars

Chalmers, Chemistry and Chemical Engineering

Louise Olsson

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

Competence Centre for Catalysis (KCK)

RSC Catalysis Series

127-156

Kemisk åldring och regenerering av NOxfällor för mager drift

Swedish Foundation for Strategic Research (SSF), 2016-01-01 -- 2020-12-31.

New methodology for fundamental kinetic models in heterogeneous catalysis using inter-disciplinary experiments

Swedish Research Council (VR), 2014-01-01 -- 2019-12-31.

Areas of Advance

Transport

Subject Categories

Chemical Process Engineering

Other Chemical Engineering

Organic Chemistry

DOI

10.1039/9781788013239-00127

More information

Latest update

12/3/2018