期刊
CATALYSIS SCIENCE & TECHNOLOGY
卷 12, 期 14, 页码 4456-4470出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2cy00572g
关键词
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资金
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [237267381, TRR 150, 426888090 (SFB 1441)]
- Steinbeis GmbH & Co KG fur Technologietransfer [STZ 240]
Planar laser-induced fluorescence with laser synchronized flow control is used to investigate the dynamics and mass transfer of a NOx storage catalyst. The experiment results are compared with numerical simulations to understand the thermodynamic equilibrium and storage rate of NO oxidation under different conditions.
Planar laser-induced fluorescence with laser synchronized flow control is employed as a non-invasive in situ technique to investigate a NOx storage catalyst, especially to grant a deeper insight into the reaction dynamics and its interaction with mass transfer. In addition to visualizing the spatial and temporal NO evolution over a Pt/BaO/Al2O3 catalyst, the spatially resolved NO distribution over a Pt/Al2O3 catalyst in the steady-state is measured to understand the oxidation of NO to NO2 as a precursor step of NOx storage. The experimental results are compared with corresponding numerical simulations using transient one- and two-dimensional reactor simulations with detailed surface reaction mechanisms. The thermodynamic equilibrium for NO oxidation over Pt/Al2O3 approaches between 623 K and 723 K, as a reduced conversion is observed at a higher temperature. The NOx storage on the Pt/BaO/Al2O3 catalyst decreases with time, which is partly due to the reduced storage capacity, but also strongly limited by the NO oxidation rate.
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