L
L. Louis Hegedus
Researcher at General Motors
Publications - 38
Citations - 1032
L. Louis Hegedus is an academic researcher from General Motors. The author has contributed to research in topics: Catalysis & Platinum. The author has an hindex of 19, co-authored 38 publications receiving 1024 citations.
Papers
More filters
Journal ArticleDOI
Poison-resistant catalysts for the simultaneous control of hydrocarbon, carbon monoxide, and nitrogen oxide emissions
TL;DR: In this paper, the authors investigated several features of the operation of noble metal catalysts in automobile exhaust near the stoichiometric air:fuel ratio (A F ), including the extent of intrapellet diffusion limitations as a function of feedstream stoichiometry, the mechanism of poisoning, and the effects of impregnation profiles on activity and poison resistance.
Poison-resistant catalysts for the simultaneous control of hydrocarbon, carbon monoxide and nitrogen oxide emissions
TL;DR: In this article, the poisoning process at exhaust stoichiometry appears to be very similar to poisoning process under net oxidizing conditions; that is, only a sharply defined outer shell of the pellets is poisoned, this shell progressing inward as time elapses.
Journal ArticleDOI
Effects of platinum and palladium impregnation on the performance and durability of automobile exhaust oxidizing catalysts
Jack C. Summers,L. Louis Hegedus +1 more
TL;DR: The performance and durability properties of noble metal-alumina oxidation catalysts are strongly influenced by the relative location of the metals along the radius of the porous catalyst pellets as mentioned in this paper.
Journal ArticleDOI
Multiple steady states in an isothermal, integral reactor: the catalytic oxidation of carbon monoxide over platinum--alumina
TL;DR: In this article, stable isothermal multiplicities were observed during carbon monoxide oxidation in an integral reactor, filled with alumina supported platinum catalysts, in the conversion-temperature, conversion-inlet carbon dioxide concentration and conversion-mass flow rate domains.
Journal ArticleDOI
Temperature excursions in catalytic monoliths
TL;DR: In this paper, experimental and theoretical studies aimed at the understanding of how heat is generated and distributed in catalytic monoliths during an exothermal, mass transfer limited reaction are presented.