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Deactivation of Three-Way Catalysts by Fuel Contaminants - Lead, Phosphorus and Sulfur
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1979 by SAE International in United States
Annotation ability available
Poisoning of a typical platinum-rhodium (Pt-Rh) automotive three-way catalyst (TWC) was determined as a function of lead (Pb), sulfur (S) and phosphorus (P) fuel levels, thermal aging and sulfur dioxide (SO2) content in the evaluation fuel. In laboratory studies catalysts were durability tested in pulse-flame reactors followed by flow-reactor activity measurements. Engine dynamometer-aged catalysts were evaluated on a slave vehicle.
For Pt-Rh TWCs the activities for nitric oxide (NO), carbon monoxide (CO) and hydrocarbon (HC) conversions were poisoned by trace levels of 1-6 mg Pb/gal (0.3 - 1.6 g/m3). When the peak temperature in the aging cycle was increased from 730 to 870°C (1346 to 1598°F), the activities improved significantly. In an attempt to mimic the effect on TWCs of misfueling with Pb levels typical of commercially available leaded fuels, TWC activities were severely poisoned. Upon reverting to fuel containing trace Pb levels, the CO activity was restored, but the NO and HC activities were only partially recovered.
The Pt-Rh TWCs were poisoned by the exhaust from fuel containing 0.03 wt % S, but not by-that from fuel containing up to 8 mg P/gal (2.1 g/m3). In the evaluation of thermally-aged catalysts, SO2 suppressed gross NO conversions and ammonia formation of Pt catalysts, but had little effect on Rh catalysts. Vehicle results for a TWC-only system indicated significantly lower HC, CO, and gross NOx conversions when the SO2 content of the exhaust gas was increased during rich operation with air/fuel fluctuations. In TWC systems followed by an oxidation catalyst, no effect from increased SO2 was observed on HC, CO or net NOx emissions.
CitationWilliamson, W., Gandhi, H., Heyde, M., and Zawacki, G., "Deactivation of Three-Way Catalysts by Fuel Contaminants - Lead, Phosphorus and Sulfur," SAE Technical Paper 790942, 1979, https://doi.org/10.4271/790942.
- Gandhi H. S. Piken A. G. Stepien H. K. Shelef M. DeLosh R. G. Heyde M. E. “Evaluation of Three-Way Catalysts, Part II,” SAE Paper 770196 1977
- Williamson W. B. Stepien H. K. Watkins W. L. H. Gandhi H. S. “Poisoning of Platinum-Rhodium Automotive Three-Way Catalysts by Lead and Phosphorus,” 176th National Meeting of the American Chem. Soc. Miami Beach, Florida September 1978 Environ. Sci. & Tech.
- Williamson W. B. Stepien H. K. Gandhi H. S. “Poisoning of Platinum-Rhodium Automotive Three-Way Catalysts: Behavior of Single-Component Catalysts and Effects of Sulfur and Phosphorus,” Sixth North American Meeting of the Catalysis Society Chicago, Illinois March 1979 Environ. Sci. & Tech.
- National Fuel Survey, Fall 1978 Summary January 1979
- Otto K. Dalla Betta R. A. Yao H. C. “A Laboratory Method for the Simulation of Automobile Exhaust and Studies of Catalyst Poisoning,” J. Air Pollution Control Assoc. 24 596 1974
- Gandhi H. S. Piken A. G. Shelef M. DeLosh R. G. “Laboratory Evaluation of Three-Way Catalysts,” SAE Paper 760201 1976
- Kobylinski T. P. Taylor B. W. “The Catalytic Chemistry of Nitric Oxide II. Reduction of Nitric Oxide Over Noble Metal Catalysts,” J. Catal. 33 376 1974
- Ashmead D. R. Campbell J. S. Davies P. Farmery K. “Nitrogen Oxide Removal Catalysts for Purification of Automobile Exhaust Gases,” SAE Paper 74029 1974
- Taylor K. C. “Simutaneous NO and CO conversion over Rhodium,” “The Catalytic Chemistry of Nitrogen Oxides,” Klimisch R. L. Larson J. G. Plenum Press New York 1975 173
- Hegedus L. L. Summers J. C. Schlatter J. C. Baron K. “Poison-Resistant Catalysts for the Simultaneous Control of Hydrocarbon, Carbon Monoxide, and Nitrogen Oxide Emissions,” J. Catal. 56 321 1979
- Weaver E. E. “Effects of Tetraethyl Lead on Catalyst Life and Efficiency in Customer Type Vehicle Operation,” SAE Paper 690016 1969
- Shelef M. Dalla Betta R. A. Larson J. A. Otto K. Yao H. C. “Poisoning of Monolithic Noble Metal Oxidation Catalysts in Automobile Exhaust Environment,” AICHE 74th National Meeting New Orleans 1973
- Shelef M. Otto K. Otto N. C. “Poisoning of Automotive Catalysts,” Advance Catal. 27 311 1978
- Otto K. Montreuil C. N. “Influence of Tetraethyl Lead and Lead Scavengers on Oxidation of Carbon Monoxide and Hydrocarbons over Pt and Pd,” Environ. Sci. & Tech. 10 154 1976
- Yao H. C. Japar S. Shelef M. “Surface Interactions in the System Rh/A1203,” J. Catal. 50 407 1977 Yao H. C. Stepien H. K. Gandhi H. S. “Metal-Support Interaction in Automotive Exhaust Catalysts: Rh-Washcoat Interaction,” National Meeting of the Amer. Chem. Soc. Washington, D. C. September 1979
- McArthur D. P. “The Catalytic Chemistry of Nitrogen Oxides,” Klimisch R. L. Larson J. G. Plenum Press New York 1975 263
- Gandhi H. S. Yao H. C. Stepien H. K. Shelef M. “Evaluation of Three-Way Catalysts -Part III: Formation of NH3, Its Suppression by SO2 and Re-oxidation,” SAE Paper 780606 1978
- Galiardi J. C. Smith C. S. Weaver E. E. “Effect of Fuel and Oil Additives on Catalytic Converter,” API Division of Refining Proceedings 52 989 1972
- Weaver E. E. Shiller J. W. Piken A. G. “Performance of Monolithic Catalysts in a Vehicle Field Test,” AICHE Symposium Series No. 156 72 369 1976