This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Analysis of Potassium Storage Components in NOx Catalysts Application of Analytical Techniques and DFT Computations to Catalytic Analysis
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 08, 2004 by SAE International in United States
Annotation ability available
By using analytical techniques (FT-IR, TG-MS, ICP) and DFT calculations, the potassium (K) used as a storage component in NOx Catalysts can be analyzed. The results from this study show that the, K exists as K2CO3, and that the amount, molecular structure, and thermal stability of K2CO3 are different, depending on the support material (ZrO2, Al2O3, or TiO2).
If the amount of K that interacts with the support to form an inactive complex oxide is decreased, the amount of K2CO3 and NOx storage is increased. The amount of the inactive K varies with the basicity of the supports.
K2CO3 that exists in unstable structures on the supports can be easy to react with NOx to form the nitrate. So, the higher the quantity of unstable K2CO3, the higher the NOx storage capacity. Based on these results, a development guideline was proposed to improve the NOx storage performance.
CitationIwata, N., Suzuki, Y., Kato, H., Takeuchi, M. et al., "Analysis of Potassium Storage Components in NOx Catalysts Application of Analytical Techniques and DFT Computations to Catalytic Analysis," SAE Technical Paper 2004-01-1494, 2004, https://doi.org/10.4271/2004-01-1494.
- Miyoshi Naoto et al. Development of New Concept Three-Way Catalyst For Automotive Lean-Burn Engines SAE Paper 950809 1995
- Kato et al. Development of NOx storage and reduction type catalyst system for lean-burn engine TOYOTA Technical Review 44 2 27 1994
- Stone Peter et al. NOx storage in model Pt/Ba NSR catalysts: fabrication and reactivity of BaO nanoparticles on Pt(111) Surface science 537 2003 179 190
- Hirata Hirohito et al. NOx storage-reduction three-way catalyst with improved sulfur tolerance Topics in Catalysis 16 2001 145 149
- Busca G. et al. Infrared spectroscopic identification of species arising from reactive adsorption of carbon oxides on metal oxide surfaces Materials Chemistry 7 1982 89 126
- KANTSCHEWA Margarita et al. Infrared and X-ray photoelectron spectroscopy study of K 2 CO 3 / -Al 2 O 3 Applied Catalysis 8 1983 71 84
- Krupay B.W. et al. Alkali-Promoted Alumina Catalysts Journal of Catalysis 67 1981 362 370