Replication of 50K Vehicle Aged Catalyst Performance Using an Engine Dynamometer Aging Cycle

1997 ◽  
Author(s):  
P. Johnson ◽  
J. Kisenyi ◽  
R. Hurley
Keyword(s):  
Aged Catalyst

Carbon Filament Growth on Fully Formulated Pd/Rh Automotive Catalysts

2000 ◽  
Vol 6 (S2) ◽  
pp. 66-67
Author(s):  
J.W. Hangas ◽  
G.W. Graham ◽  
R.W. McCabe ◽  
W. Chun
Keyword(s):  
Carbon Monoxide ◽  
Catalytic Activity ◽  
Operating Conditions ◽  
The Other ◽  
Carbon Filament ◽  
Automotive Catalysts ◽  
Exhaust Catalysts ◽  
Stabilization Procedure ◽  
Carbon Filaments ◽  
Aged Catalyst

Automotive exhaust catalysts are typically operated under stoichiometric conditions to minimize nitrogen oxide, hydrocarbon, and carbon monoxide pollutants. These catalysts do not form carbon filaments under normal operating conditions. In development of catalysts, however, a stabilization procedure is sometimes utilized on used catalysts (dynamometer or vehicle) to purge the catalyst of sulfur prior to measuring the catalytic activity in sweep and light-off testing. The stabilization procedure consists of running the catalyst under rich (excess fuel) conditions for 0.5hr. This study documents the existence of carbon filaments due to the stabilization procedure and discusses the effect of filaments on subsequent testing.Two separate catalysts were used in this study. The first was a 50,000 mile vehicle aged catalyst that had also been through the stabilization procedure and then sweep and light-off tested. The other was only dynamometer aged for 120hr at 850°C (1560°F).

Deactivation of PdO–Al2O3 oxidation catalyst in lean-burn natural gas engine exhaust: aged catalyst characterization and studies of poisoning by H2O and SO2

1999 ◽  
Vol 21 (3) ◽  
pp. 157-169 ◽  
Author(s):  
Deborah L Mowery ◽  
Michael S Graboski ◽  
Tim R Ohno ◽  
Robert L McCormick
Keyword(s):  
Natural Gas ◽  
Oxidation Catalyst ◽  
Catalyst Characterization ◽  
Lean Burn ◽  
Engine Exhaust ◽  
Gas Engine ◽  
Natural Gas Engine ◽  
Aged Catalyst

Characterization of aged catalyst from hydrotreating petroleum residue

1997 ◽  
pp. 311-321 ◽  
Author(s):  
M.T. Martínez ◽  
J.M. Jiménez ◽  
M.A. Callejas ◽  
F.J. Gómez ◽  
C. Rial ◽  
...  
Keyword(s):  
Petroleum Residue ◽  
Aged Catalyst
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