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Evaluation of NOx Adsorber Catalysts Systems to Reduce Emissions of Lean Running Gasoline Engines
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 01, 1996 by SAE International in United States
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Most automobile manufacturers are looking for methods to increase fuel economy. It is possible to achieve this by operating under lean conditions. The problem remains, however, that while hydrocarbon and carbon monoxide oxidation is very efficient on a 3-way catalyst in an oxidising atmosphere, reduction of oxides of nitrogen (NOx) is poor. One method to improve the efficiency for NOx reduction under lean conditions is to use a 3-way catalyst in conjunction with a NOx trap. The NOx trap stores NOx under lean conditions which is then released and reduced under rich conditions.
Bench evaluations using a lean tune engine have been carried out on a number of 3-way catalysts containing a range of different NOx adsorbent components. Measurements of adsorption capacity, temperature window for lean NOx conversion and thermal durability have been made and a comparison of different adsorption materials determined. The effect of Pt loading on these parameters has also been ascertained. A lean NOx efficiency of close to 100 % has been observed over a wide temperature range. The effect of addition of a close coupled catalyst upstream of the NOx trap is also discussed.
CitationBrogan, M., Brisley, R., Moore, J., and Clark, A., "Evaluation of NOx Adsorber Catalysts Systems to Reduce Emissions of Lean Running Gasoline Engines," SAE Technical Paper 962045, 1996, https://doi.org/10.4271/962045.
SAE 1996 Transactions - Journal of Fuels and Lubricants
Number: V105-4; Published: 1997-09-15
Number: V105-4; Published: 1997-09-15
- Iwamoto M. Yahiro H. Mine Y. Kagawa S. “Excessively Cu Ion Exchanged ZSM-5 Zeolites as Highly Active Catalysts for Direct Decomposition of NO” Chem. Lett. 1989 213
- Hightower W. Van Leirsburg D.A. Klimish R.L. Larson J.G. “The Catalytic Chemistry of Nitrogen Oxides” Plenum, London 1975 63
- Li Y. Hall K.H. “Catalytic Decomposition of Nitric Oxide over Cu-Zeolites” J. Catal. 129 1991 202
- Iwamoto M. Yahiro H. Kutsuno T. Bunyu S. Kagawa S. “Enhancement of Catalytic Activity of Cu Ion Exchanged Y Type Zeolites for the Decomposition of NO” Bull. Chem. Soc. Jpn. 62 1989 583
- Schrod M. Semel J. Steiner R. “Processes for Lowering NOx Emissions in Flue Gases” Chem. Ing. Tech. 57 1985 717
- Held W. König A. Richter T. Puppe L. “Catalytic NOx-reduction in net oxidising, exhaust gas” SAE 900496 1990
- Iwamoto M. Hamada H. “Removal of Nitrogen Monoxide from Exhuast-gas through Novel Catalytic Processes” Catal. Today 10 1991 57
- Ansell G.P. Diwell A.F. Golanski S.E. Hayes J.W. Rajaram R.R. Truex T.J. Walker A.P. “The Mechanism for Lean NOx Reduction over Cu/ZSM-5” App. Catal. B 2 1993 81
- Truex T.J. Searles R.A. Sun D.C. “Catalysts for Nitrogen Oxides Control under Lean Burn Conditions” Platinum Metals Rev. 36 1992 2
- Shelef M. “Selective Catalytic Reduction of NOx with N-free Reductants” Chem. Rev. 95 1995 209
- Sato S. Yu Y. Yahiro H. Mizuno N. Iwamoto M. “Cu/ZSM-5 as highly Active Catalyst for Removal of Nitrogen Monoxide from Emission of Diesel Engines” Appl. Catal. 70 1991 L1
- Sun D.C. “NOx Storage Components” Johnson Matthey Internal Report 1991
- Boegner W. Krämer M. Krutzsch B. Pischinger S. Voigtländer D. Wenninger G. Wirbeleit F. Brogan M.S. Brisley R.J. Webster D.E. “Removal of Nitrogen Oxides from the Exhuast Gas of a Lean Mixture Gasoline Engine” App. Catal. B 7 1995 153
- Brogan M.S. Brisley R.J. Webster D.E. Boegner W. Krämer M. Krutzsch B. Fekete N.P. Voigtländer D. “Evaluation of NOx Storage Catalysts as an Effective System for NOX Removal from the Exhaust Gas of Leanburn Gasoline Engines” SAE 952490 1995
- Kato K. Nohira H. Nakanishi K. Iguchi S. Kihara T. Muraki H. 1993
- Boegner W. Haak K.E. Krutzsch B. Wenninger G. 1994
- Kateshima S. Iguchi S. Tanaka T. Araki Y. Hirota S. Kobashi K. 1993
- Muraki H. Saiki M. Adachi M. Watsumoto S. Kanazawa T. Kobashi K. 1993
- Miyoshi N. Matsumoto S. Katoh K. Tanaka T. Harada J. Takahara N. “Development of New Concept Three Way Catalyst for Automotive Lean-Burn Engines” SAE 950809
- Brogan M.S. Walker C.J. “In-situ X-ray Diffraction Characterization of NOx Storage Catalysts” Johnson Matthey Internal Report 1995
- Brogan M.S. Hamilton H.G.C. Rajaram R.R Diwell A.F. 1996