Reactivity Comparison of an Automotive Exhaust Catalyst to a Proprietary Contractor Supplied Material

1993 ◽  
Author(s):  
Alex A. Klinghoffer ◽  
Joseph A. Rossin ◽  
Todd M. Wilson ◽  
David E. Tevault
Keyword(s):  
Automotive Exhaust ◽  
Automotive Exhaust Catalyst

Cerium phosphate in automotive exhaust catalyst poisoning

2004 ◽  
Vol 50 (2) ◽  
pp. 113-125 ◽  
Author(s):  
L Xu ◽  
G Guo ◽  
D Uy ◽  
A.E O’Neill ◽  
W.H Weber ◽  
...  
Keyword(s):  
Catalyst Poisoning ◽  
Automotive Exhaust ◽  
Cerium Phosphate ◽  
Automotive Exhaust Catalyst

scholarly journals Electrical promotion-assisted automotive exhaust catalyst: highly active and selective NO reduction to N2 at low-temperatures

2021 ◽  
Author(s):  
Yuki Omori ◽  
Ayaka Shigemoto ◽  
Kohei Sugihara ◽  
Takuma Higo ◽  
Toru Uenishi ◽  
...  
Keyword(s):  
Low Temperature ◽  
Electric Field ◽  
Low Temperatures ◽  
No Reduction ◽  
Automotive Exhaust ◽  
Highly Active ◽  
Automotive Exhaust Catalyst

Low-temperature operation of TWC can be achieved even at 423 K by applying an electric field to the semiconductor catalyst.

Analytical Electron Microscopy study of two vehicle-aged automotive exhaust catalysts having dissimilar activities

1989 ◽  
Vol 47 ◽  
pp. 272-273
Author(s):  
Sooho Kim ◽  
M. J. D’Aniello
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Noble Metal ◽  
Catalyst Deactivation ◽  
Analytical Electron Microscopy ◽  
Microscopy Study ◽  
Metal Particles ◽  
Automotive Exhaust ◽  
Exhaust Catalysts ◽  
Analytical Electron

Automotive catalysts generally lose-agtivity during vehicle operation due to several well-known deactivation mechanisms. To gain a more fundamental understanding of catalyst deactivation, the microscopic details of fresh and vehicle-aged commercial pelleted automotive exhaust catalysts containing Pt, Pd and Rh were studied by employing Analytical Electron Microscopy (AEM). Two different vehicle-aged samples containing similar poison levels but having different catalytic activities (denoted better and poorer) were selected for this study.The general microstructure of the supports and the noble metal particles of the two catalysts looks similar; the noble metal particles were generally found to be spherical and often faceted. However, the average noble metal particle size on the poorer catalyst (21 nm) was larger than that on the better catalyst (16 nm). These sizes represent a significant increase over that found on the fresh catalyst (8 nm). The activity of these catalysts decreases as the observed particle size increases.

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