THE INFLUENCE OF LEAD COMPOUNDS ON AUTOMOTIVE EXHAUST CATALYSTS

Studies have been made of the effects of lead bromide and lead chloride on the catalytic activity and other properties of several unsupported and alumina-supported transition metal oxides used for the control of air pollutants in motor vehicle exhausts. Complete deactivation of unsupported oxides generally corresponds with the formation of a monolayer of lead halide on the catalyst surface, although considerably greater quantities of lead are needed to eliminate altogether the activity of cobalt oxides. With moxt of the supported catalysts, the lead halides are preferentially adsorbed on the alumina support. No such behaviour is observed, however, with supported cobalt oxides, where amounts of lead halides well below those required to form a monolayer reduce the catalytic activity to zero. The lead halides deposited on most oxide catalysts can be removed by a stream of inert gas at a high temperature, whereupon the catalytic activity is restored to its original value. (Author)

  • Supplemental Notes:
    • Proceedings of the International Clean Air; Clean Air, the Continuing Challenge. Sponsored by the Clean Air Society of Australia and New Zealand, Bisbane, Australia, May 15-17, 1978.
  • Corporate Authors:

    Ann Arbor Science Publishers, Incorporated

    230 Collingwood, P.O. Box 1425
    Ann Arbor, MI  USA  48106
  • Authors:
    • Cullis, C F
  • Publication Date: 1978-5

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Filing Info

  • Accession Number: 00308060
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 30 1980 12:00AM