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Characterization of Automotive Catalysts Exposed to the Fuel Additive MMT
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Abstract
A series of in-use catalysts having mileage of 22,000 to 43,000 miles was characterized to determine the effect of the fuel additive MMT. The analytical techniques included visual examination, x-ray fluorescence, x-ray diffraction, optical microscopy, scanning electron microscopy, and electron raicroprobe. In addition, catalyst activity was measured and compared to the catalyst activity from a pulsator aged catalyst without the MMT additive in the feed gas composition. Characterization results show a significantly thick layer (5-20 microns) covering the surface of the catalysts which results in the increase of mass transfer resistance. Steady state R and light-off measurements indicated catalyst efficiency is also significantly reduced as exposure to MMT is increased.
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Citation
Hurley, R., Watkins, W., and Griffis, R., "Characterization of Automotive Catalysts Exposed to the Fuel Additive MMT," SAE Technical Paper 890582, 1989, https://doi.org/10.4271/890582.Also In
References
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- Williamson W. B. Gandhi H. S. Weaver E. E. “Effects of Fuel Additive MHT on Contaminant Retention and Catalyst Performance” SAE Paper 821193 1982
- Otto K. Sulak R. J. “Effects of Mn Deposits from MMT on Automotive catalysts in the Absence and Presence of Other Fuel Additives” Environmental Science and Technology 12 181 1978
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- Wallace J. S. Garbe R. J. “Effects of MMT on Exhaust Emissions” SAE Paper 790707 1979